Search results for: Convert string array to list

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The join function returns a string that Apr 08, 2020 · Convert a Python's list, dictionary or Numpy array to a Pandas data frame. writer() function. CSV format was used for many years prior to attempts to describe the format in a standardized way in RFC 4180.

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A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

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In VB .NET, I can use Redim to convert List of String to string array without knowing the size in advance. But how to do it in C#? im fileList As New List(Of String). Dim array(1) As String 'redim later. Do... fileList.Add(myFileData.fileName & " "

stackoverflow.com

12-04-2012 · C# - Convert String array to String List. 3. Convert ArrayOfString to List<string> in C# for Windows Phone 7. 1. Convert custom delimited string to List<myClass>? Related. 7083. What is the difference between String and string in C#? 1081. Convert a string to an enum in C#. 1514.

12-04-2012Array
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Java convert string array to list example, This article will describe how to convert Java string to list or Arraylist. Arrays.asList() to convert string to list in java Please consider disabling your ad blocker for Java4s.com, we won't encourage audio ads, popups or any other annoyances at any point, hope you support us :-) Thank you.

Convert String to ArrayList in Java

Convert a String Into ArrayList Using the charAt () and add () Methods in Java. A simple solution can be to iterate through each character of the string and add that character to the ArrayList. We will use the charAt () method to access the characters of the string, and then we can add them to the ArrayList by using the add () method.

This tutorial introduces the conversion of String to ArrayList in Java and lists some example codes to understand the topic.

A string is defined as a sequence of characters, and an ArrayList is used to store an ordered sequence of data. Converting a string to an ArrayList requires us to take each character from the string and add it to the ArrayList.

In this article, we’ll discuss the different ways by which we can do this.

Convert a String Into ArrayList Using the charAt() and add() Methods in Java

A simple solution can be to iterate through each character of the string and add that character to the ArrayList. We will use the charAt() method to access the characters of the string, and then we can add them to the ArrayList by using the add() method.

The code for this approach is shown below.

import java.util.ArrayList;
public class SimpleTesting
{
    public static void main(String[] args)
    {
        String s = "sample";
        ArrayList list = new ArrayList();
        for(int i = 0; i < s.length(); i  )
        {
            char currentCharacter = s.charAt(i);//getting the character at current index
            list.add(currentCharacter);//adding the character to the list
        }
        System.out.println("The String is: "   s);
        System.out.print("The ArrayList is: "   list);
    }
}

Output:

The String is: sample
The ArrayList is: [s, a, m, p, l, e]

We cannot use this approach if we wish to do something more advanced. For example, if we want to add just the words of a sentence to an ArrayList and ignore the punctuations, further processing will be required.

Convert a String Into ArrayList Using the toCharArray() Method in Java

The toCharArray() method can be used on a string to convert it into a character array. We can then iterate over this character array and add each character to the ArrayList.

See the example below.

import java.util.ArrayList;
public class Main
{
    public static void main(String[] args)
    {
        String s = "sample";
        ArrayList list = new ArrayList();
        char[] characterArray = s.toCharArray();
        for(char c : characterArray)//iterating through the character array
            list.add(c);
        System.out.println("The String is: "   s);
        System.out.print("The ArrayList is: "   list);
    }
}

Output:

The String is: sample
The ArrayList is: [s, a, m, p, l, e]

This is a simple method that can be used if we don’t want to do anything complicated. However, just like the approach discussed in the previous section, we cannot use this if we’re going to do some processing on the string (like removing punctuations) before converting it to an ArrayList.

the split() Method in Java

The string split() method takes a regular expression or pattern as a parameter and splits the string into an array of strings depending on the matching patterns. This method returns a string array.

For example, if we pass the string string of words to the split() method, and the pattern is single whitespace (denoted by //s ), then it will return the array ["string", "of", "words"].

import java.util.Arrays;
public class Main
{
    public static void main(String[] args)
    {
        String s = "string of words";
        String[] strArr = s.split("\s ");//Splitting using whitespace
        System.out.println("The String is: "   s);
        System.out.print("The String Array after splitting is: "   Arrays.toString(strArr));
    }
}

Output:

The String is: string of words
The String Array after splitting is: [string, of, words]

Convert a String Into ArrayList Using the split() Method in Java

We can create an ArrayList from the returned array of strings by using the asList() method of the Arrays class. The following code demonstrates this.

import java.util.ArrayList;
import java.util.Arrays;
public class Main
{
    public static void main(String[] args)
    {
        String s = "string of words";
        String[] strArr = s.split("\s ");//Splitting using whitespace
        ArrayList list = new ArrayList(Arrays.asList(strArr));
        System.out.println("The String is: "   s);
        System.out.print("The ArrayList is: "   list);
    }
}

Output:

The String is: string of words
The ArrayList is: [string, of, words]

Create an ArrayList Using the split() Method in Java

The split() method needs to be changed according to our needs. For example, if we want to create an ArrayList of individual characters of the string sample, then the split() method needs a different regular expression.

import java.util.ArrayList;
import java.util.Arrays;
public class Main
{
    public static void main(String[] args)
    {
        String s = "sample";
        String[] strArr = s.split(""); //Splitting string into individual characters
        ArrayList list = new ArrayList(Arrays.asList(strArr));
        System.out.println("The String is: "   s);
        System.out.print("The ArrayList is: "   list);
    }
}

Output:

The String is: sample
The ArrayList is: [s, a, m, p, l, e]

Convert User String Into ArrayList in Java

Suppose we take an input string from the user that contains comma-separated employee names, and we have to make an ArrayList that includes each employee’s name.

We can use the split() method to split the string into an array of employee names, and then we can simply convert it to an ArrayList. The split() method is perfect for this task as we need to remove the commas before creating the ArrayList.

See the example below.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        String employeeNames;
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter employee names separated by comma");
        employeeNames = scanner.nextLine();//taking user input
        scanner.close();
        String[] employeeNamesSplit = employeeNames.split(",");//Splitting names
        ArrayList list = new ArrayList(Arrays.asList(employeeNamesSplit));
        System.out.println("The String is: "   employeeNames);
        System.out.print("The ArrayList is: "   list);
    }
}

Output:

Enter employee names separated by comma
Justin, Jack, Jessica, Victor
The String is: Justin, Jack, Jessica, Victor
The ArrayList is: [Justin,  Jack,  Jessica,  Victor]

Convert a String Array Into ArrayList in Java

Arrays are great for storing data in an ordered fashion, but their limited size can restrict some important operations. We can simply convert a string array to an ArrayList by using the asList() method. It will simply copy all items of the array into the list.

The following code demonstrates this.

import java.util.ArrayList;
import java.util.Arrays;
public class Main
{
    public static void main(String[] args)
    {
        String[] strArr = {"Hello", "Hola", "Ola"};
        ArrayList strList = new ArrayList(Arrays.asList(strArr));
        System.out.println("The String Array is: "   Arrays.toString(strArr));
        System.out.println("The Array List is: "   strList);
    }
}

Output:

The String Array is: [Hello, Hola, Ola]
The Array List is: [Hello, Hola, Ola]

Convert a String Into ArrayList in Java

Strings are commonly used for many different purposes, but they are immutable, and we cannot apply changes to them. An ArrayList, on the other hand, provides a lot more flexibility. We can create an ArrayList from the individual characters of the string, or if we need to do something more complicated (like creating an ArrayList of names from a comma-separated string), we can use the split() method.

Overall, the split() method is the easiest and the most preferred way of converting a string to an ArrayList.

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Related Article - Java String

Return a String in JavaConvert String to Int Array in JavaCurrency Format in JavaGet Character in String by Index in JavaInitialize an Array in Constructor in JavaConvert Java String Into Byte
geeksforgeeks.org

Throws: PatternSyntaxException – if the provided regular expression’s syntax is invalid. Approach: Splitting the string by using the Java split() method and storing the substrings into an array.; Creating an ArrayList while passing the substring reference to it using Arrays.asList() method.

Java convert String array to ArrayList example

25-01-2016 · 1) Convert Java String array to List using the Arrays class. Use the asList method of the Arrays class to convert string array to a List object. public static <T> List<T> asList(T …. a) Please note that the List object returned by the asList method is a fixed sized list which is backed by the original array.

25-01-2016

This example shows how to convert String array to ArrayList in Java using Arrays, Collections, and Apache Commons including what is the most efficient way to convert.

How to convert String array to ArrayList in Java?

1) Convert Java String array to List using the Arrays class

Use the asList method of the Arrays class to convert string array to a List object.

public static List asList(T a)

Example

package com.javacodeexamples.stringexamples;
import java.util.ArrayList;
public class StringArrayToArrayListExample {
    public static void main(String[] args){
        String[] stringWeekdays =
            {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
        List listDays = Arrays.asList(stringWeekdays);
        System.out.println("Convert String array to List");
        for(String day : listDays){
        ArrayList aListDays = new ArrayList(listDays);

Output

Convert String array to List

Please note that the List object returned by the asList method is a fixed sized list which is backed by the original array. Adding or removing any elements from the list will throw java.lang.UnsupportedOperationException exception. However, you can update the values in the list.

//this will throw UnsupportedOperationException

Output

Exception in thread "main" java.lang.UnsupportedOperationException
    at java.util.AbstractList.add(Unknown Source)
    at java.util.AbstractList.add(Unknown Source)
    at com.javacodeexamples.stringexamples.StringArrayToArrayListExample.main(StringArrayToArrayListExample.java:29)
//this will also throw UnsupportedOperationException

Output

Exception in thread "main" java.lang.UnsupportedOperationException
    at java.util.AbstractList.remove(Unknown Source)
    at com.javacodeexamples.stringexamples.StringArrayToArrayListExample.main(StringArrayToArrayListExample.java:32)
//Modify first element of list to "Sunday" instead of "Sun"
listDays.set(0, "Sunday");

2) Using the Collections class

Use the addAll method of the Collections class to add all elements of an array to the ArrayList.

String[] stringWeekdays =
    {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
ArrayList aListDays = new ArrayList();
Collections.addAll(aListDays, stringWeekdays);
System.out.println("Convert String array to ArrayList example");
for(String day : aListDays){

Output

Convert String array to ArrayList example

Please note that, if the ArrayList object had some elements before the Collections.addAll method is called, all the elements of the String array will be added after existing elements of the ArrayList object.

3) Using Apache Commons Collections

If you are using the Apache Commons library, you can use the addAll method of the CollectionUtils class to add all elements of a string array to an ArrayList as given below.

String[] stringWeekdays =
    {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
ArrayList aListDays = new ArrayList();
CollectionUtils.addAll(aListDays, stringWeekdays);

What is the best way to convert String array to ArrayList?

If you do not intend to add or remove elements from the ArrayList after converting it from the string array, use the List object returned directly from the asList method of the Arrays class. This is an efficient approach to convert string array to an ArrayList because it does not create a copy of an original array and operate on the same array.

If you want to add or remove elements from the ArrayList, convert that list to an ArrayList using the ArrayList constructor as given in the example code, or use the addAll  method of the Collections or CollectionUtils class.

This example is a part of the Java String tutorial and ArrayList in Java Tutorial.

Please let me know your views in the comments section below.

tutorialkart.com

Convert String Array to ArrayList in Java To convert String Array to ArrayList in Java, we can use for loop or Arrays Class. In this tutorial, we shall go through some examples where we convert a…

To convert String Array to ArrayList in Java, we can use for loop or Arrays Class. In this tutorial, we shall go through some examples where we convert a String[] to ArrayList.

404 image

Example 1 – String[] to ArrayList using For Loop

In the following example, we will initialize an empty ArrayList and add the items of string array one by one to this ArrayList using a for loop.

Example.java

import java.util.ArrayList;

public class Example {

	public static void main(String[] args) {
		
		// string array
		String[] names = {"Java","Kotlin","Android"};
		
		// declare an arraylist that hold strings
		ArrayList nameList = new ArrayList();
		
		// add each element of string array to arraylist
		for(String name:names) {
			nameList.add(name);
		}
		
		// print the arraylist
		nameList.forEach(name ->{
			System.out.println(name);
		});
	}
}

Output

Java
Kotlin
Android

Example 2 – String Array to ArrayList using ArrayList.addAll() and Arrays.asList()

To convert String Array to ArrayList, we can make use of Arrays.asList() function and ArrayList.addAll().

Arrays.asList(String[]) returns List with elements of String[] loaded to List.

Now, we can make use of ArrayList.addAll(List) that adds elements of List to the ArrayList.

Example.java

import java.util.ArrayList;
import java.util.Arrays;

public class Example {

	public static void main(String[] args) {
		
		// string array
		String[] names = {"Java","Kotlin","Android"};
		
		// declare an arraylist that hold strings
		ArrayList nameList = new ArrayList();
		
		// add elements of array to arraylist
		nameList.addAll(Arrays.asList(names));
		
		// print the arraylist
		nameList.forEach(name ->{
			System.out.println(name);
		});
	}
}

Output

Java
Kotlin
Android

Conclusion

In this Java Tutorial, we learned how to convert String Array to ArrayList.

Using for Loop is better than the latter approach. When we are using Arrays.asList() function, an intermediate List is created, which is avoided when for loop is used.

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Convert String to List [Array]

01-06-2021 · Split string into words. The first way to convert a string to a list, so it contains words as elements, is to split it by spaces. my_string = 'This is a string.' my_list = my_string.split() print(my_list) The split function takes an optional parameter, which is a separator by which a string is split into smaller chunks.

01-06-2021

If you want to convert a string to a list, you have a bunch of options; you can do it for entire sentences, words, or characters.

In this lesson, I’ll show you how you can do this using a few different approaches.

Split string into words

The first way to convert a string to a list, so it contains words as elements, is to split it by spaces.

my_string = 'This is a string.'
my_list = my_string.split()
print(my_list)

The split function takes an optional parameter, which is a separator by which a string is split into smaller chunks. By default, it uses space as a separator, so we don’t need to add it explicitly.

If you run the code, you’ll get words as a list of elements.

['This', 'is', 'a', 'string.']

Split string into a list of characters

If you like to convert a string to a list of characters, you can use the for a loop.

my_string = 'Just a string.'
my_list = []

for my_elem in my_string:
    my_list.append(my_elem)

print(my_list)

First, we created an empty list. In the for loop, each string element (character) is appended to the end of the list. The whole string is therefore converted to a list.

If you run the code, you’ll get this result.

['J', 'u', 's', 't', ' ', 'a', ' ', 's', 't', 'r', 'i', 'n', 'g', '.']

In the previous example, I wrote that the split function takes an additional parameter – the separator. If you want to change it from space to comma, you have to do it explicitly.

my_string = 'String,separated,by,commas.'
my_list = my_string.split(',')
print(my_list)

Result:

['String', 'separated', 'by', 'commas.']

Convert String Elements to Ints if Possible

If your string contains integer values, which you want to convert into list elements, but keep the type if possible, you have to recognize them first, and then cast them to int.

my_string = 'Actual temperature is 17.'
my_list = my_string.split()
new_list = []

for my_elem in my_list:
    if my_elem.isdigit():
        new_list.append(int(my_elem))
    else:
        new_list.append(my_elem)

print(new_list)

If you print new_list to the console, you will notice that all elements but the last one are strings.

['Actual', 'temperature', 'is', 17]

So far so good. But try to change 17 to -17.

['Actual', 'temperature', 'is', '-17']

The negative number is still written as a string. We could remove the negative number and then try to check if the value is int. But there is another problem. Some words that are not integers can contain “-“.

One method to deal with it is to create a temporary variable where remove “-” from the beginning, and if then the value is still a digit, we know that we deal with a negative number.

my_string = 'Actual temperature is -17'
my_list = my_string.split()
new_list = []

for my_elem in my_list:
    temp_var = my_elem
    if my_elem[0] == '-':
        my_elem = my_elem[1:]
    if my_elem.isdigit():
        new_list.append(int(temp_var))
    else:
        new_list.append(temp_var)

print(new_list)

First, the function checks whether the first character in the word is “-“. If it is the case, it tries to check whether the value is a digit. If the condition is met it cast the negative number to int.

Now, the code works for both positive and negative numbers.

['Actual', 'temperature', 'is', -17]

This approach is probably not very elegant. We can do it differently.

First, let’s create a function that will try to convert the value to int. If it fails, it will return false, if it succeeds, it will return true, and then we know that the value can be converted to int.

my_string = 'Actual temperature is -17'
my_list = my_string.split()
new_list = []

def IsInt(s):
    try:
        int(s)
        return True
    except ValueError:
        return False

for my_elem in my_list:
    if IsInt(my_elem):
        new_list.append(int(my_elem))
    else:
        new_list.append(my_elem)

print(new_list)

Now, the code is much cleaner and the returned list is the same for both: negative and positive numbers.

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What about the reverse case?. Converting List<int> to comma seperated string. Is that possible using LINQ??? This can be achived through String Join . List<int> intList = new List<int>(); string strCommaSeperated = String.Join("," , intList);

geeksforgeeks.org

Below are methods to convert Array to List in Java: Brute Force or Naive Method: In this method, an empty List is created and all elements present of the Array are added to it one by one. Get the Array to be converted. Iterate through the items in the Array.

Convert String to List in Python

26-01-2000 · While programming we may need to convert a string to list in Python. That could be for any other reason. But, a question arises here, how can we convert a

26-01-2000

While programming we may need to convert a string to list in Python. That could be for any other reason. But, a question arises here, how can we convert a string to different forms of lists?

So, here in this tutorial, we are going to learn how we can convert a string into a list in Python.

Methods of converting a string to list in Python

Conversion of a string to list in Python is a pretty easy job. It can be achieved by following different methods as per our own requirements.

Here in this tutorial, we are going to deal with all the methods using which we can convert a string to list in Python for different cases. Below we have listed all the methods:

  • String to List of Strings
  • String to List of Characters
  • List of Strings to List of Lists
  • CSV to List
  • A string consisting of Integers to List of integers

Now we are going to discuss each one of the above-mentioned techniques one-by-one.

1. String to List of Strings

When we need to convert a string to list in Python containing the constituent strings of the parent string(previously separated by some separator like ‘,’ or space), we use this method to accomplish the task.

For example, say we have a string “Python is great”, and we want a list which would contain only the given names previously separated by spaces, we can get the required list just by splitting the string into parts on the basis of the position of space.

Let us look at an example to understand it better.

#given string
string1="Python is great"

#printing the string
print("Actual String: ",string1) 
  
#gives us the type of string1
print("Type of string: ",type(string1))  

print("String coverted to list :",string1.split()) 
#prints the list given by split()

Output:

String To List in Python
String To List Of Strings

In the above code:

  • We consider a string, string1="Python is great" and try to convert the same a list of the constituent strings
  • type() gives us the type of object passed to the method, which in our case was a string
  • split() is basically used to split a string into a list on the basis of the given separator. In our code, the words were separated by spaces. By default, if we do not pass anything to the split() method it splits up the string on the basis of the position of spaces
  • Hence though we have not mentioned the separator parameter, the split() method gives us a list of the respective strings

2. String to List of Characters

What if we need a list of characters present in a string? In that case, direct type conversion from string to list in Python using the list() method does the job for us.

Certainly, if the input string is something like “abcd”, typecasting the string into a list using the list() method gives us a list having the individual characters ‘a’, ‘b’, ‘c’, ‘d’ as its elements. Take a look at the given example code below.

#given string
string1="AskPython"

#printing the string
print("Actual String: ",string1)
#confirming the type()
print("Type of string: ",type(string1))

#type-casting the string into list using list()
print("String coverted to list :\n",list(string1))

Output:

String To List Of Characters
String To List Of Characters

Understanding the code:

  • Firstly here, we initialize a string, string1 as “AskPython” and print its type using the type() method
  • And as we can observe, typecasting the string using the list() method gives us a list of the member characters, as required

3. List of Strings to List of Lists

Here, we are going to see how we can combine both the above methods to convert a string to a list of character lists.

Look at the below-given example carefully,

#Given string
string1="This is Python"

print("The actual string:",string1)

#converting string1 into a list of strings
string1=string1.split()

#applying list method to the individual elements of the list string1
list1=list(map(list,string1))

#printing the resultant list of lists
print("Converted to list of character list :\n",list1)

Output:

String To List Of Character Lists
String To List Of Character Lists

Understand the code:

  • In this case, after the initialization of the string string1, we use the first method and convert it into a list of strings
  • That is, at this point string1 is a list of strings given by [ 'This', 'is', 'Python' ]
  • Then we apply the list() method to all the elements of the list
  • string1. As we saw in our previous case this gives us a list consisting of character lists. Note, mass type-casting was performed using the map() function

4. CSV to List

A CSV( Comma Separated Values) string, as its name suggests is a string consisting of values or data separated by commas.

Let us look at how we can convert such type of string to list in Python.

#given string
string1="abc,def,ghi"
print("Actual CSV String: ",string1)
print("Type of string: ",type(string1))

#spliting string1 into list with ',' as the parameter
print("CSV coverted to list :",string1.split(','))

Output:

CSV To List
CSV To List

Here:

  • Similarly, we initiate by considering a string string1 with various data or values separated by commas(‘,’)
  • After printing it and its type(), we proceed by splitting it on the basis of the parameter ‘,’
  • This makes the values ‘abc’, ‘def’, and ‘ghi’ the elements of a list. In this way, we were actually able to extract values from a given CSV

5. A string consisting of Integers to List of integers

Now we are going to convert a string consisting of only integers separated by some space, comma or etc., to a list with integer type elements.

For example, look at the code below,

#string with integers sepated by spaces
string1="1 2 3 4 5 6 7 8"
print("Actual String containing integers: ",string1)
print("Type of string: ",type(string1))

#coverting the string into list of strings
list1=list(string1.split())
print("Converted string to list : ",list1)

#typecasting the individual elements of the string list into integer using the map() method
list2=list(map(int,list1))
print("List of integers : ",list2)

Output:

String With Integers To List
String With Integers To List

Now:

  • We took a string, string1 as “1 2 3 4 5 6 7 8” and print it and its type() consecutively
  • Then we split it using the split() method and store the resultant list into a list, list1. At this point, list1 holds [ ‘1’, ‘2’ , ‘3’, ‘4’, ‘5’, ‘6’, ‘7’, ‘8’ ] as we can see from the output, as expected
  • Now we map the function int() throughout the list, typecasting each one of the elements into integers. And further, we store the typecasted mapped list into list2 and print the same
  • As a result, we get a list consisting of the integer elements on which now we can perform arithmetic operations.

Conclusion

That’s all now, this was all about converting strings into different lists using various methods. Try to use the one which suits your code and solves your purpose as well as meets up to your requirements. Questions in the comments are appreciated.

References

  • https://www.askpython.com/python/string

forgetcode.com

Access Specifier 6 ADO .Net 3 Basics 16 Collections 1 Console 1 Date Functions 15 Delegates 1 File 7 Keywords 2 LINQ 1 Loops 1 Math Snippets 5 Memory Management 1 Operators 3 Reflection 2 Regular Expressions 3 String Functions 18 String Snippets 8 Threading 1 Type Casting 5

Java Array to List

In Java, Array and List are the two most important data structures. In this section, we will learn how to convert Java Array into a List. We have also created Java programs that convert Array into a…

In Java, Array and List are the two most important data structures. In this section, we will learn how to convert Java Array into a List. We have also created Java programs that convert Array into a List by using different Java methods.

Converting Array to List in Java

Java array is a collection of multiple values of the same data type. An array can contain objects and primitive types. It depends on the definition of the array. If an array definition is of primitive type, the values of the array store in the contagious memory location. If an array contains objects elements, elements stored in the heap segment.

In Java, a List is an interface that belongs to the Java Collections framework. It stores elements in the form of objects in an ordered manner and preserves the insertion order. It allows us to store duplicate values. The classes ArrayList, LinkedList, Vector and Stack implements the List interface.

Java Array to List

Java provides five methods to convert Array into a List are as follows:

  • Native Method
  • Using Arrays.asList() Method
  • Using Collections.addAll() Method
  • Using Java 8 Stream API
  • Using Guava Lists.newArrayList() Method

Native Method

It is the simplest method to convert Java Array into a List. In this method first, we create an empty List and add all the elements of the array into the List. Let's see an example.

ArrayToListExample1.java

Output:

Java Array to List

Using Arrays.asList() Method

It is the method of the Java Arrays class that belongs to java.util package. When we use the asList() method with the Collection.toArray() method, it works as a bridge between array-based and collection-based APIs.

Syntax:

The method parses an array as a parameter by which the list will be backed. It returns a serializable fixed-size list view of the specified array. Let's see an example.

ArrayToListExample2.java

Output:

Java Array to List

Using Collections.addAll() Method

It is the method of the Java Collections class. it belongs to java.util package. The class provides a method named addAll(). We can use the method to convert Array into a List. It adds all the elements to the specified collection. We can specify elements either individually or in the form of an array. It works the same as c.addAll(Arrays.asList(elements)). It is a faster implementation than another implementation.

Syntax:

It parses two parameters:

  • c: It is a collection in which elements are to be added.
  • elements: The elements are to be inserted into c.

It returns true if the collection changed as a result of the call. It throws the following exceptions:

  • If the parameter c does not support the add operation, it throws UnsupportedOperationException.
  • If the specified array elements contain one or more null values and c does not allow null elements, it throws NullPointerException.
  • If any array element prevents it from being added to the parameter c it throws IllegalPointerException.

Let's see an example.

ArrayToListExample3.java

Output:

Java Array to List

Using Java 8 Stream API

Java 8 provides the Stream API to process the collections of objects. It is a sequence of methods that can be pipelined to produce the desired result. Remember that it does not change the original data structure. It provides the output based on the pipelined methods. We can attain Stream in a number of ways but in the following program, we have used Arrays.stream(Object[]) to attain the stream.

Collectors.toList() Method: The method returns a Collector that collects the input elements into a newly created List in an encounter method.

Syntax:

Where T is the type of element that we have specified. The method does not provide guarantees on type, mutability, thread-safety, and serializability.

Let's use the Stream API in a Java program and convert an array into a List.

ArrayToListExample4.java

Output:

Java Array to List

Using Guava Lists.newArrayList()

It is the method of the Lists class that belong to com.google.common.collect package. The class provides a method newArrayList() that creates mutable empty ArrayList instance having the elements of the specified array.

Syntax:

ArrayToListExample5.java

Output:

Java Array to List

Next TopicJIT in Java

Convert List [Array] to String

30-05-2021 · The fastest way to convert a list (array) to a string is to use the join function. my_string = ['This', 'is', 'a', 'string'] print(' '.join(my_string)) The join function concatenates all elements…

30-05-2021

The fastest way to convert a list (array) to a string is to use the join function.

my_string = ['This', 'is', 'a', 'string']
print(' '.join(my_string))

The join function concatenates all elements inside the list and uses spaces as separators.

The result of this code is this string.

This is a string

This code is easily modifiable when you want to change a separator to different one. Let’s try a comma.

my_string = ['This', 'is', 'a', 'string']
print(','.join(my_string))

By changing one character, you are getting this result.

This,is,a,string

Int List to String

If you try to convert a list that contains integer values instead of strings, Python is going to return an error.

TypeError: sequence item 0: expected str instance, int found

We have to convert integer values to strings before we can join them. For this task, we are going to use the for loop.

my_ints = [1, 22, 13, 214]
my_string = ''

for my_int in my_ints:
    my_string  = ','   str(my_int)

my_string = my_string[1:]
print(my_string)

The problem with this approach is that it adds a comma at the beginning of the string which we want to avoid. That’s why we add a line my_string = my_string[1:] that removes the first character and assigns this value to my_string.

1,22,13,214

This result can be also achieved by using a range inside the loop and then adding a separator after the first iteration (which starts from 0).

my_ints = [1, 22, 13, 214]
my_string = ''

for i in range(len(my_ints)):
    if i > 0:
        my_string  = ','
    my_string  = str(my_ints[i])

print(my_string)

The result is the same.

1,22,13,214

The quickest and most Pythonic way to do it, is to convert integers to string in one line. Here’s the code.

my_ints = [1, 22, 13, 214]
print(','.join(str(x) for x in my_ints))

The result is the same as before but the code uses only two lines.

Map List

Another simple way to convert a list of ints to a string is to use the map function. There is no need to use loops in this case.

my_ints = [1, 22, 13, 214]
print(','.join(map(str, my_ints)))

In our case, the map function takes a list as a second parameter and applies the str function. In other words, it converts integers inside the list to strings. The join function concatenates these elements, using a comma as a separator. The result is the same as in previous examples.

1,22,13,214

Nested List

We can also convert a list of lists to a string. The elements in our list consist of multiple smaller lists. In these lists are both strings and integer values. We have to convert these values to strings and then join them to create a one-dimensional list.

This is how the code looks like:

my_list = [[1, '1'], [2], ['This', 'is', 3]]
result_list = [' '.join([str(c) for c in lst]) for lst in my_list]

print(result_list)

This is how the result looks like:

['1 1', '2', 'This is 3']

This list has to be joined to create a single string. We can use the method from the first example. The full code looks like this:

my_list = [[1, '1'], [2], ['This', 'is', 3]]
result_list = [' '.join([str(c) for c in lst]) for lst in my_list]
my_string = ' '.join(result_list)

print(my_string)

As expected, the result is a string.

1 1 2 This is 3

Convert List to String With Quotes

String values are written inside quotes. If you want to add quotes to a string you can’t just add another quote between quotes, because Python will return the syntax error. If you use three quotes “””text”””, the result will be the same as with single quotes.

SyntaxError: invalid syntax

What you have to do is to use different quotes. You can do it for single quotes.

my_list = ["This", "is", "'text'", "string"]
my_string = ' '.join(my_list)
print(my_string)

Result:

This is 'text' string

You can also do it for double quotes.

my_list = ['This', 'is', '"text"', 'string']
my_string = ' '.join(my_list)
print(my_string)

Result:

This is "text" string

You can also combine both quotes.

my_list = ['This', 'is', '"text"', "'string'"]
my_string = ' '.join(my_list)
print(my_string)

Result:

This is "text" 'string'
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Convert String to List in C# and string array to list

Convert String Array to List using C# Now, as you can see in above example, we were using string with "," as seperator, to convert it into an array But if you are using srting array, then you can simply use .ToList () linq method on an array to convert it into List.

In previous article, I have mentioned how to convert list to comma separated string in C#, but now in this article, I have mentioned how we can convert comma separated string to List in C# and array string into list using C# console application example.

Convert String to List using C#

First, we will split string by using "," as delimiter

Next, We can simply use List constructor (which accepts IEnumerable) which will take convert splitted string into List

So here is the complete code

using System;
using System.Collections.Generic;
					
public class Program
{
	public static void Main()
	{
		var names = "Ariana,Peter,John";
        List nameList = new List(names.Split(','));
		foreach(var name in nameList)
		{
			Console.WriteLine(name);
		}
	}
}

Output:

Ariana
Peter
John

string-to-list-csharp-min

Linq method (Using .ToList())

There is another method using Linq to convert string into list.

We can also simply use .ToList() Linq method after splitting string using .Split()

using System;
using System.Collections.Generic;
using System.Linq; // add this
					
public class Program
{
	public static void Main()
	{
		var names = "Ariana,Peter,John";
        List nameList = names.Split(',').ToList(); // .ToList() using System.Linq
		foreach(var name in nameList)
		{
			Console.WriteLine(name);
		}
	}
}

Output is same as above.

Convert String Array to List using C#

Now, as you can see in above example, we were using string with "," as seperator, to convert it into an array

But if you are using srting array, then you can simply use .ToList() linq method on an array to convert it into List.

using System;
using System.Collections.Generic;
using System.Linq; // add this
					
public class Program
{
	public static void Main()
	{
		string [] array = { "Hello","World", "John", "Here"};
        List listItems = array.ToList();
		foreach(var name in listItems)
		{
			Console.WriteLine(name);
		}
	}
}

and the output of above code will be

Hello
World
John
Here

That's it, hope it helps.

You may also like to read:

Visual Studio Code Intellisense (autocomplete) not working

How can I convert string to time in C#?

Useful Visual Studio Shortcuts (comment, remove comment, Collapse code etc )

Using Generics in C# (With Example)

File I/O in C# (Read, Write, Delete, Copy file using C#)

Object Oriented Programming (OOPS) concepts in c# with example

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How do you convert an ArrayList to an array in Java?

Way #2. <T> T [] toArray (T [] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array. If the list fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the ...

JavaObject Oriented ProgrammingProgramming

An ArrayList provides two methods to convert it into Array.

Way #1

Object[] toArray()

Returns an array containing all of the elements in this list in proper sequence (from first to last element).

Way #2

 T[] toArray(T[] a)

Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array. If the list fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this list.

Type Parameter

  • T − The runtime type of the array to contain the collection.

Parameters

  • a − The array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.

Returns

An array containing the elements of this list.

Throws

  • ArrayStoreException − If the runtime type of the specified array is not a supertype of the runtime type of every element in this list.

  • NullPointerException − If the specified array is null.

Example

Following is the example showing the usage of toArray() methods −

package com.tutorialspoint;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class CollectionsDemo {
   public static void main(String[] args) {
      List list = new ArrayList<>(Arrays.asList("A","B","C", "D"));
      System.out.println("List: " + list);
      Object[] items = list.toArray();
      for (Object object : items) {
         System.out.print(object + " ");
      }
      System.out.println();
      String[] characters = list.toArray(new String[list.size()]);
      for (String string : characters) {
         System.out.print(string + " ");
      }
   }
}

Output

This will produce the following result −

List: [A, B, C, D]
A B C D
A B C D
raja

Published on 09-May-2022 12:10:48

mcdonoughcofc.org

In this post the input is hardcoded for demonstration. Return/Print the list of String. Convert a List<String> in a String with all the values of the List comma separated using Java 8 is really straightforward. converting a Stream of String to a List of String, or converting a Stream of Integer to List of Integer, and so on.

Python String to Array - How to Convert Text to a List

21-02-2022 · How to Convert a String to a List of Words . Another way to convert a string to a list is by using the split() Python method. The split() method splits a string into a list, where each list item is each word that makes up the string. Each word will be an individual list item. Syntax Breakdown of the split() Method in Python

21-02-2022

There will be times where you need to convert one data type to another.

Fear not, because Python offers a variety of different ways to help you do that.

In this article, you'll see a few of the ways in which you can convert a string to a list.

Here is what we will cover:

What are Strings and Lists in Python?

A string is an ordered sequence of characters. It is a series of characters, with one character following the other.

A string is surrounded by either single or double quotation marks:

# all the following are strings

# a string enclosed in single quotes
first_name = 'John'

#a string enclosed in double quotes
last_name = "Doe"

If you want to create a string that spans multiple lines, or what is known as a multiline string, use triple quotes to start and end it:

# a multiline string enclosed in triple quotes

phrase = '''I am learning Python
and I really enjoy learning the language!
'''

Strings are immutable. This means that once they have been created, they cannot change. The individal characters that make up a string cannot be altered.

For example, if you tried to change the first letter of a word from lowercase to uppercase, you would get an error in your code:

#try and change lowercase 'p' to uppercase 'P'
fave_language = "python"
fave_language[0] = "P"

print(fave_language)

#the output will be an error message
#fave_language[0] = "P"
#TypeError: 'str' object does not support item assignment

However, you can reassign a different string by updating the variable, like so:

fave_language = "python"
fave_language = "Python"

print(fave_language)

#output
#Python

A list is an ordered collection of data.

Multiple (typically related) items are stored together under the same variable.

You can create a list by enclosing zero or more items in square brackets, [], each separated by a comma.

A list can contain any of Python's built-in data types.

# a list of numbers
my_numbers_list = [10,20,30,40,50]

print(my_numbers_list)

#output
# [10, 20, 30, 40, 50]

Lists are mutable.

You can change list items after the list has been created. This means that you can modify existing items, add new items, or delete items at any time during the life of the program.

programming_languages = ["Javascript", "Python", "Java"]

#update the 1st item in the list
programming_languages[0] = "JavaScript"

print(programming_languages)

#output
#['JavaScript', 'Python', 'Java']

How to Determine the Data Type of an Object in Python

To find the data type of an object in Python, use the built-in type() function, which has the following syntax:

type(object)

#where object is the object you need to find the data type of

The type() function will return the type of the object that was passed as an argument to the function.

This is commonly used for debugging purposes.

Let's see how to use type() with strings and lists in the example below:

my_name = "John Doe"
my_lucky_numbers = [7,14,33]

print(type(my_name))
print(type(my_lucky_numbers))

#output
#
#

How to Convert a String to a List of Individual Characters

You can take a word and turn it into a list.

Every single character that makes up that word becomes an individual and separate element inside the list.

For example, let's take the text "Python".

You can convert it to a list of characters, where each list item would be every character that makes up the string "Python".

This means that the P character would be one list item, the y character would be another list item, the t character would be another one, and so on.

The most straightforward way is to type cast the string into a list.

Tyepcasting means to directly convert from one data type to another – in this case from the string data type to the list data type.

You do this by using the built-in list() function and passing the given string as the argument to the function.

programming_language = "Python"

programming_language_list = list(programming_language)

print(programming_language_list)

#output
#['P', 'y', 't', 'h', 'o', 'n']

Let's take a look at another example:

current_routine = " Learning Python ! "

current_routine_list = list(current_routine)

print(current_routine_list)

#output
#[' ', 'L', 'e', 'a', 'r', 'n', 'i', 'n', 'g', ' ', 'P', 'y', 't', 'h', 'o', 'n', ' ', '!', ' ']

The text " Learning Python ! " has both leading and trailing whitespace, whitespace between the words "Learning" and "Python", and whitespace between the word "Python" and the exclamation mark.

When the string is converted to a list of characters, every whitespace is treated as an individual character and that's why you see empty spaces, ' ', as list items.

To remove whitespace only from the beginning and end of the string, use the strip() method.

current_routine = " Learning Python ! "

#the leading and trailing whitespace will no longer be separate elements in the list
current_routine_list = list(current_routine.strip())

print(current_routine_list)

#output
#['L', 'e', 'a', 'r', 'n', 'i', 'n', 'g', ' ', 'P', 'y', 't', 'h', 'o', 'n', ' ', '!']

To remove all and not just the leading and trailing whitespace and make it so no whitespace characters are included in the new list, use the replace() method instead:

current_routine = " Learning Python ! "

#replace every instance of whitespace with no space
current_routine_list = list(current_routine.replace(" ", ""))

print(current_routine_list)

#output
#['L', 'e', 'a', 'r', 'n', 'i', 'n', 'g', 'P', 'y', 't', 'h', 'o', 'n', '!']

How to Convert a String to a List of Words

Another way to convert a string to a list is by using the split() Python method.

The split() method splits a string into a list, where each list item is each word that makes up the string.

Each word will be an individual list item.

Syntax Breakdown of the split() Method in Python

The general syntax for the split() method is the following:

string.split(separator=None, maxsplit=-1)

Let's break it down:

  • string is the given string you want to turn into a list.
  • The split() method turns a string into a list. It takes two optional parameters.
  • separator is the first optional parameter, and it determines where the string will split. By default the separator is whitespace and the string will split wherever there is any whitespace.
  • maxsplit is the second optional parameter. It specifies the maximum number of splits to do. The default value, -1, means that it splits across all the entire string and there are no limits to the splitting.

Let's see an example of how that works.

phrase = "I am learning Python !"

print(type(phrase))

#output
#

In the above string, each word that makes up the string is separated by a whitespace.

To turn that string into a list of words, use the split() method.

You don't need to specify a separator or a maxsplit paramter, as we want to separate all the words wherever there is whitespace between them.

phrase = "I am learning Python !"

phrase_to_list = phrase.split()

print(phrase_to_list)
print(type(phrase_to_list))


#output
#['I', 'am', 'learning', 'Python', '!']
#

The string was split based on where there was any whitespace, and each word that made up the string turned into an individual list item.

How to Use the split() method with a Separator

You can also convert a string to a list using a separator with the split() method. The separator can be any character you specify.

The string will separate based on the separator you provide.

For example, you can use a comma, ,, as the separator.

The string will turn into a list whenever there is a comma, starting from the left.

Items that are comma separated will be the individual list items.

Let's take the following string:

phrase = "Hello world,I am learning Python!"

There is a comma that separates Hello world from I am learning Python!.

If we want to use that comma as a separator to create two individual list items, we would do the following:

phrase = "Hello world,I am learning Python!"

phrase_to_list = phrase.split(",")

print(phrase_to_list)

#output
#['Hello world', 'I am learning Python!']

Two separate items were created as list items and the separation occured where there was a comma.

Another example could be to separate a domain name, whenever there is a dot, ..

domain_name = "www.freecodecamp.org"

domain_name_list = domain_name.split(".")

print(domain_name_list)

#output
#['www', 'freecodecamp', 'org']

Every time there is a dot, a new list item will be added to the list.

How to Use the split() method with the maxsplit Paramter

As mentioned earlier, maxsplit is an optional parameter of the split() method.

It defines how many elements of the list will get split and turned into individual list items. By default, it is set to -1, which means all elements that make up the string will be split.

But we can change the value to a specific number.

To split only two words and not every word, we set maxsplit to two:

current_routine = "I enjoy learning Python everyday"

current_routine_list = current_routine.split(maxsplit=2)

print(current_routine_list)

#output
#['I', 'enjoy', 'learning Python everyday']

maxsplit is set to 2, which means a maximum of only two words will be split by space and will make two individual list items. The third list item will be the rest of the words that make up the initial string.

Using another example from the section above, you can combine a separator with maxsplit to make a targeted conversion of a string to a list:

domain_name = "www.freecodecamp.org"

domain_name_list = domain_name.split(".", maxsplit=1)

print(domain_name_list)

#output
#['www', 'freecodecamp.org']

In this example, the separator was a dot and only the first element got split.

Numbers are considered strings when they are enclosed in either single or double quotes.

Say you have your date of birth stored as a string, like such:

birthdate = "19/10/1993"

print(type(birthdate))

#output
#

To remove the slashes and store the numbers associated with the date, month, and year of birth as separate list items, you would do the following:

birthdate = "19/10/1993"

birthdate_list = birthdate.split("/")

print(birthdate_list)
print(type(birthdate_list))

#output
#['19', '10', '1993']
#

In the example, the separator was the slash, /, and whenever there was a slash a new list item was created.

If you take a closer look at the output you'll see that the list items are still strings, since they are surrounded by single quotes and there has been no type conversion.

To convert each list item from a string to an integer, use the map function.

The map function takes two arguments:

  • A function. In this case the function will be the int function.
  • An iterable, which is a sequence or collection of items. In this case the iterable is the list we created.

birthdate = "19/10/1993"

birthdate_list = birthdate.split("/")

str_to_int = (map(int, birthdate_list))

print(str_to_int)

#output
#

That is not exactly the output we wanted. When we check the data type, we see that we no longer have a list:

print(type(str_to_int))

#output
#

To correct this, we instead need to go back and add the list() function before the conversion:

birthdate = "19/10/1993"

birthdate_list = birthdate.split("/")

str_to_int = list(map(int, birthdate_list))

print(type(str_to_int))
print(str_to_int)

#output
#
#[19, 10, 1993]

Conclusion

And there you have it! You now know some of the ways to convert a string to a list in Python.

To learn more about the Python programming language, check out freeCodeCamp's Scientific Computing with Python Certification.

You'll start from the basics and learn in an interacitve and beginner-friendly way. You'll also build five projects at the end to put into practice and help reinforce what you've learned.

Thanks for reading and happy coding!

scaler.com

Moreover, converting a string to a string array using the split() method and using the regex pattern are all discussed in the further topics. Introduction to String Array in Java An array is a collection of similar types of values that are stored at contiguous memory locations whereas a string stores a sequence of characters.

www.techiedelight.com

15-11-2016 · www.techiedelight.com

15-11-2016

This post will discuss how to convert a list of strings to a string array in Java.

1. Using List.toArray() method

We can use the toArray(T[]) method to copy the list into a newly allocated string array. We can either pass a string array as an argument to the toArray() method or pass an empty string type array. If an empty array is passed, JVM will allocate memory for the string array. Please note that if no argument is passed to toArray(), it will return an Object array.

    // convert a list of strings to a string array in Java
    public static void main(String[] args)
        List list = Arrays.asList("NYC", "New Delhi");
        String[] array = list.toArray(new String[0]);
        System.out.println(Arrays.toString(array));

Download  Run Code

Output:
[NYC, New Delhi]

2. Using Java 8

Java 8 provides another simple approach to convert a list of strings to a string array. Following are the steps:

The following program demonstrates it:

    // convert a list of strings to a string array in Java 8 and above
    public static void main(String[] args)
        List list = Arrays.asList("NYC", "New Delhi");
        String[] array = list.stream()
        System.out.println(Arrays.toString(array));

Download  Run Code

Output:
[NYC, New Delhi]

3. Using Arrays.copyOf() method

We can also use Arrays.copyOf() to copy the specified array to an array of the specified type.

    // convert a list of strings to a string array in Java
    public static void main(String[] args)
        List list = Arrays.asList("NYC", "New Delhi");
        String[] array = Arrays.copyOf(list.toArray(), list.size(),
        System.out.println(Arrays.toString(array));

Download  Run Code

Output:
[NYC, New Delhi]

4. Using System.arraycopy() method

We can use System.arraycopy() that copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

    // convert a list of strings to a string array in Java
    public static void main(String[] args)
        List list = Arrays.asList("NYC", "New Delhi");
        String[] array = new String[list.size()];
        System.arraycopy(list.toArray(), 0, array, 0, list.size());
        System.out.println(Arrays.toString(array));

Download  Run Code

Output:
[NYC, New Delhi]

5. Naive solution

This post is incomplete without re-inventing the wheels. A naive approach uses regular for-loop to iterate over the list of strings and simply copy elements from a list to string array.

    // convert a list of strings to a string array in Java
    public static void main(String[] args)
        List list = Arrays.asList("NYC", "New Delhi");
        // allocate memory for string array
        String[] array = new String[list.size()];
        // copy elements from a list to a string array
        for (int i = 0; i < array.length; i ) {
        System.out.println(Arrays.toString(array));

Download  Run Code

Output:
[NYC, New Delhi]

That’s all about converting List of String to an array of Java String.


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Convert ArrayList to String array in Android - Android

Convert ArrayList to String array in Android - Android [ Glasses to protect eyes while coding : https://amzn.to/3N1ISWI ] Convert ArrayList to String array ...

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It splits a string into sub string and returns it as a new array. Now another statement where a List is created with the name nl and that object of the List is assigned a ArrayList type of value by converting it from string, which is str[] here. And then using enhanced For loop, prints all the converted valued.

javatpoint.com

To convert the ArrayList to String Array by using the copyOf () method, we will access the ArrayList, convert it to objects from the ArrayList, and then convert it to String Array. Consider the below example to understand the implementation of this method: import java.util.*;

ArrayList and String Array are both used to store a group of objects. The ArrayList is a data structure used to store the group of the object, while a string array is used to store a group of strings values. Sometimes we need to convert our data structure from ArrayList to String Array. Unfortunately java.util package does not provide any direct method for this conversion. However, we can perform this conversion using some methods.

The ArrayList can be converted to String directly using the Spring Framework. Spring framework provides two very popular and well-known features, Dependency Injection and IOC container, which contains API for some common conversions like Collection to String. The ArrayList can be easily converted using Spring's StringUtils class.

In the Java collection framework, we can convert our data structure from ArrayList to String Array using the following methods:

  • Using ArrayList.get() method
  • Using copyOf() method
  • Using toArray() method

Method1: Using ArrayList.get() method

The ArrayList.get() method is a manual way of converting all the ArrayList elements to the String Array. It copies all the elements from ArrayList to String Array[].

Consider the below example to implement this method:

Output:

From the above example, we have copied all the ArrayList elements to the String Array[]. We have used the size() method to obtain the ArrayList size, then fetched its element using the get() method and assigned each element to the respected array element by using the assignment (=) operator.

Method2: Using copyOf() method

The copyOf() method is used to copy the specified array with the specified length ( truncating or padding with false). To convert the ArrayList to String Array by using the copyOf() method, we will access the ArrayList, convert it to objects from the ArrayList, and then convert it to String Array.

Consider the below example to understand the implementation of this method:

Output:

ArrayList: [Hello, Java, Tpoint]
String Array[]: [Hello, Java, Tpoint]

From the above example, we have fetched the ArrayList using the GetArrayElements function and converting it to an object using the toArray() method, then converting it to String Array using the copyOf() method.

Method3: Using toArray() method

The toArray() method is used to return an array having all the elements in the collection. Here, we are using toArray() method to convert the ArrayList to String Array.

Consider the below example to understand the implemention of this method:

Output:

From the above example, we have converted ArrayList elements to the String Array. In this method, we do not need to copy each element from the array list to the array. We can fetch them all by using the toArray() method.

Hence, we can change our data structure from ArrayList to String Array using any of the above methods. All of the above methods are efficient and will work for all the Java versions. We have performed all the examples on Java version 8

Next TopicDifference Between Hashmap and ConcurrentHashMap

Java - String to ArrayList conversion

09-05-2015 · In this java tutorial we are converting a String to an ArrayList.The steps for conversion are as follows: 1) First split the string using String split() method and assign the substrings into an array of strings. We can split the string based on any character, expression etc.

09-05-2015

In this java tutorial we are converting a String to an ArrayList. The steps for conversion are as follows:
Java - Convert String to ArrayList
1) First split the string using String split() method and assign the substrings into an array of strings. We can split the string based on any character, expression etc.

2) Create an ArrayList and copy the element of string array to newly created ArrayList using Arrays.asList() method. This method returns a list created based on the elements of the specified array.

Program to convert String to ArrayList

In this java program we have a string which contains some numbers with delimiter as comma (,). We are splitting the string based on the delimiter and then assigning those numbers to an array of strings.
Later we are copying all the elements of string array to an ArrayList using the asList() method of Arrays.

import java.util.ArrayList;
import java.util.List;
import java.util.Arrays;
public class JavaExample {
    public static void main(String args[]){
	String num = "22,33,44,55,66,77";
	String str[] = num.split(",");
	List al = new ArrayList();
	al = Arrays.asList(str);
	for(String s: al){
	   System.out.println(s);
	}
   }
}

Output:

22
33
44
55
66
77

Note: In the above example, the delimiter is comma however we can split the string based on any delimiter. For example – if the string is “hello hi namaste bye” then we can split the string using whitespace as delimiter like this –

Here we have provided whitespace as delimiter
String str[] = num.split(" ");
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Or convert char to string firstly, then convert this string to int using int.Parse(). char c = '1'; int number = int.Parse(c.ToString()); Professional provider of PDF & Microsoft Word and Excel document editing and modifying solutions, available for ASP.NET AJAX, Silverlight, Windows Forms as well as WPF.

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4 hours ago · Default is "flat". , if the msgType is urn:ietf:params Tree contains two lines of code. Since. On most situations you will be using one of the following four levels of RAIDs. Mar 22, 2019 · To convert a float array to an integer array in python, a solution is to use astype, example: >>> import numpy as np >>> A = np.

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1. String [] strings = new String [] {"1", "2" }; 2. List<String> stringList = new ArrayList<String>(Arrays.asList(strings)); //new ArrayList is only needed if you absolutely need an ArrayList. 3. . Source: stackoverflow.com. js string to array. javascript by …

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This is the standard way to collect the result of the stream in a container like a List, Set, or any Collection. With Java 7 and older releases, the only way to convert a List to

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Related Questions & Answers; Converting ArrayList<String> to String[] in java; How to get the duplicates values from Arraylist<String> and then get those items in …

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8 minutes ago · PDF to Word. A Blob object is a file-like object used to represent raw immutable data. Example: Convert Blob to Base64 Encoded String using FileReader API. You can easily add the Export to PDF functionality on the web page without depending on the server-side script. In addition to PDFKit, you'll need somewhere to stream the output to.

Python String To List - Complete Tutorial

20-09-2021 · Read Remove character from string Python (35 Examples). Convert a string to a list in Python. By using the Python list() function we can perform this particular task and this method takes iterable objects and converts them into the list.. Here is the code of string to list in Python. new_val = "john is a good boy" new_out = list(new_val.strip(" ")) print(new_out)

20-09-2021

In this Python tutorial, you will learn about Python String to list. Let us see how to convert Python string to list and also we will cover the below examples:

  • Python string to list of characters
  • Python string to list conversion
  • Python string to list with separator
  • Python string to list of words
  • Python string to list split
  • Python string to list of ints
  • Python string to list with spaces
  • Python string to list newline
  • Python string to list of dictionaries
  • Python string to list of strings
  • Python string to list by delimiter
  • Python string to list of floats
  • Python string to list array
  • Python string to list without split
  • Python add string to list elements
  • Python string list extract substring
  • Python string split to list regex
  • Python string list remove duplicates
  • Python string list index
  • Python string to list of tuples
  • Python string to list of json
  • Python string to list remove spaces
  • Python string list to dataframe
  • Python string list max length
  • Python string list to byte array
  • Python string vs list

Python string to list

  • In this program, we are going to learn how to convert a string to a list in Python.
  • To convert a string to a list in Python we can easily apply the split() method. This method will help the user to break up a string at a given separator and it always returns the split string in a list.
  • In Python string if the delimiter is not given in the function as a parameter or if by default its value is none then a different splitting algorithm is applied.

Syntax:

Here is the Syntax of the split() function

String.split(separator,maxsplit)
  • It consists of a few parameters
    • Separator: It is an optional parameter and it is used to split the string if not provided then whitespace will be considered as a delimiter.
    • Maxsplit: It specifies how many splits are required in the function.

Example:

Let’s take an example and check how to convert a string to a list.

new_str = "java is a best programming language"

new_lis = list(new_str.split(" ")) 
print("convert str to list:",new_lis) 

In the above code first, we initialize a string ‘new_str’ and then use the split() method and pass whitespace as a delimiter which splits the words of the string, and stores them into the list.

Here is the Screenshot of the following given code

Python string to list
Python string to list

Read Remove character from string Python (35 Examples)

Convert a string to a list in Python

By using the Python list() function we can perform this particular task and this method takes iterable objects and converts them into the list.

Here is the code of string to list in Python

new_val = "john is a good boy"

new_out = list(new_val.strip(" "))
print(new_out)

In this example, we use the concept of strip() function and it will remove spaces from the string at the first and the end of the string.

Here is the execution of the following given code

Python string to list
Python string to list

Read How to create a string in Python

Python string to list of characters

  • Let us see In Python, how to convert a string into a list of characters by using the inbuilt list() method.
  • In Python the list() constructor generates a list directly from iterable objects and it always returns a list of all the characters which is available in the string and in this example we have to pass a string object to the list() method.

Syntax:

Here is the Syntax of a list() method

list(iterable)
  • It consists of only one parameter
    • Iterable: This parameter can be used as a sequence or we can say any other iterable objects.

Source Code:

give_str = 'Micheal'

new_val2 = list(give_str)
print(new_val2) 

In the above code, we have already taken the input string ‘Micheal’ and now we use the list() constructor and it will give us a list having the individual characters ‘M’, ‘i’ as elements.

Here is the implementation of the following given code

Python string to list of characters
Python string to list of characters

Read Python list comprehension using if-else

Check how to convert a string into a list of characters

By using the Python list comprehension method we can convert a string into a list of characters. In Python, the list comprehension method is used to build a new list. List comprehension is an easy way to define and declare lists based on existing lists.

Here is the Source code:


str_new = 'Australia'
 
new_char = [i for i in str_new]
print(new_char) 

In the above example, a list is assigned to a variable ‘str_new’, and the list stores the items of the iterable objects. After that, we call print() statement to display the output.

Here is the execution of the following given code

Python string to list of characters
Python string to list of characters

Read Python remove substring from a String Examples

Python string to list conversion

  • Let us see how to converse a string into a list in Python.
  • In this example, we use the concept of a split() function and if you want to break a string to list then you did not provide any separator or delimiter to the split method. If the delimiter is not given in the function parameter then by default it takes none value.

Syntax:

Here is the Syntax of the split() function

string.split(delimiter, maxsplit)

Example:

pro_lang = "Python developer"

new_char = pro_lang.split()
print("Conversion string to list:",new_char)

Here is the Output of the following given code

Python string to list conversion
Python string to list conversion

Read Python 3 string replace() method

Python string to list with separator

  • In Python to convert a string into a list with a separator, we can use the str. split() method.
  • In this example, we can use the comma-separated string ‘,’ and convert them into a list of characters. In python, the split() function is basically used to break a string into a list on the basis of the separator.
  • Here we have mentioned the separator parameter in the split() method.

Here is the Source Code:

stu_name = "oliva,Elijah,Potter"

new_lis = stu_name.split(",")
print(new_lis)

Output:

Python string to list with separator
Python string to list with separator

Read Python compare strings

Python string to list of words

  • Let us see how to convert a string into a list of words in Python, the easiest way to solve this problem is to use the split() method and this method will break a string into a list where each word is a list item.
  • In this example by default, the delimiter for this function is whitespace and we have to split the first index element.

Source Code:

def convert(Country_name):
    return (Country_name[0].split())
 
Country_name = ["Australia Germany"]
print(convert(Country_name))

In the above code first, we define a function ‘convert’ and then pass list ‘country_name’ as an argument. Now create a list and call print() statement to display the result.

Here is the execution of the following given code

Python string to list of words
Python string to list of words

Read Python 3 string methods with examples

Python string to list split

  • Here we can see how to convert a string to a list by using the split() method in Python.
  • In Python, the split() method always returns a list of the words in the string and also divides a string into a list. By default, the separator is a whitespace character like space, ‘ ‘,\n, etc.

Syntax:

Here is the Syntax of the split() function

string.split(separator,maxsplit)

Source Code:

new_str = 'John,micheal,George'

print(new_str.split('-'))

Here is the Output of the following given code

Python string to list split
Python string to list split

Read Python find substring in string

Python string to list of ints

  • Let us see how to convert a string list to an integer list in Python.
  • By using the list comprehension method we can perform this particular task, this method is used to build a new list where each list element is to iterate.

Example:

val_lis = ['16', '87', '27', '19', '145']

new_char = [int(x) for x in val_lis]
print ("updated list is : ",new_char)

In the above example we have a list ‘val_lis’ and then apply the built-in function int and get a list of integers by using the list comprehension method.

Here is the implementation of the following given code

Python string to list of ints
Python string to list of ints

How to convert a string list to an integer

By using the map and split() function we can solve this problem, In Python, the map() function is well efficient and easy to convert a list of strings into integer and this method always returns an iterator, convert the string into an integer list.

Source Code:

new_char = "15 27 89"

val_list = new_char.split()
new_item = map(int, val_list)
d = list(new_item)
print(d)

Here is the Screenshot of the following given code

Python string to list of ints
Python string to list of ints

Read Could not convert string to float Python

Python string to list with spaces

  • Here we can see how to convert a string to a list with whitespace in Python.
  • To perform this task we can use the function join(). In Python, the join() function is a string method that returns str by combining all the elements of iterable objects and separated by ‘ ‘.

Source Code:

def convert(new_name):
      
    return ' '.join(new_name)
new_name = ['Adam','Hayden','Chris']
print(convert(new_name))

Here is the Output of the following given code

Python string to list with spaces
Python string to list with spaces

Read Slicing string in Python

How to convert a string to a list with spaces

By using the ‘*’ operator we can convert a string to a list with white spaces in Python. In this example first, we declare a list ‘new_val_lis’ and store them integer values.

Source Code:

new_val_lis = [16,82,93,46]
print(*new_val_lis)

new_val = ['lily','rose','jasmine']
print(*new_val)

Here is the Screenshot of the following given code

Python string to list with spaces
Python string to list with spaces

Read Convert string to float in Python

Python string to list newline

  • Here we can see how to split a string along with the newline delimiter in Python. To do this task first we will declare a list of all lines in the string separated at line ends.
  • By using “\n”,”\r” special characters we can separate the characters in a given string and these line boundaries are defined as splits in the string.

Example:

new_variable = "z y u \n i t a \r t z x"

new_sep_char = new_variable.splitlines()
print(new_sep_char)

Here is the execution of the following given code

Python string to list newline
Python string to list newline

Read Append to a string Python

Cconvert strings into a list using newline – Another approach

By using the splitline() method we can solve this problem and this function is used to split the lines at line boundaries in Python.

Source Code:

new_string1 = 'Oliva\nis\nagood\nprogrammer'

new_str2= new_string1.splitlines()
print(new_str2)

Here is the Screenshot of the following given code

Python string to list newline
Python string to list newline

Read Add string to list Python Examples

Python string to list of dictionries

  • Let us see how to convert a string to a list of dictionaries in Python.
  • To perform this particular task we can use the method eval(). This method checks the data type and returns the result in the form of a list. In Python, the eval() is a built-in function and it evaluates the string and converts them into the list.

Source Code:

country_str = "[{'australia' : 15, 'England' : 19}, {'Germany' : 27, 'Europe' : 37}]"

new_output = list(eval(country_str))
print(new_output)

In the above example first, we initialize a string and then use the eval() method to convert a list of dictionaries.

Here is the implementation of the following given code

Python string to list of dictionaries
Python string to list of dictionaries

Read Python program to reverse a string with examples

Python string to list of strings

  • In Python to convert string to list of strings we can use the split() function and this method will help the user to break a string into a list where each word is a list item.

Example:

pro_sting =" Mongodb sql java"

print("original str: ",pro_sting) 
print("Convert string to list of str :",pro_sting.split()) 

In the above code first, we consider a string, ‘pro_sting’, and then apply the split() function. It is used to break a string into a list on the given separator. In this example, we have not mentioned the separator argument is a split() function.

Here is the Output of the following given code

Python string to list of strings
Python string to list of strings

Read Python string formatting with examples

Python string to list by delimiter

  • Here we can see how to convert a string to a list by using a delimiter in Python.
  • By default, the delimiter takes whitespace and separates the words but in this example, we have mentioned ‘,’ as a delimiter in split() function.

Source Code:

alpha_str = 'o,q,e,x,c'

new_list = alpha_str.split(",")
print (new_list)

In the above code first, we consider a string ‘alpha_str’ and assign them characters in single-quoted ‘ ‘. Now we can use the split() function and pass ‘,’ delimiter as an argument.

Here is the Output of the following given code

Python string to list by delimiter
Python string to list by a delimiter

Read How to concatenate strings in python

Python string to list of floats

  • By using the map and split() function we can perform this task, In Python, the map() function is well efficient and easy to convert a list of strings into floats and this method always returns an iterator, to convert the string into a float list.

Source Code:

flo_str = "31.9 23.4 118.3"

new_val_lis = flo_str.split()
new_item = map(float, new_val_lis)
z = list(new_item)
print("Convert string to float list:",z)

In this example, we have created a string ‘flo_str’ and assign them float values. Now by using the map() function we have passed float data type as an argument and store them into a ‘new_item’ variable.

Output:

Python string to list of floats
Python string to list of floats

Read How to Convert Python string to byte array with Examples

Another example by using list comprehension and eval() method

  • You can also convert a string to a list of float numbers by using Python in-built function eval() and list comprehension.
  • In Python the list comprehension method declares new lists from other iterables like strings and the eval() method parses expression parameters and checks the arithmetic expression as a string.

Example:

i = ["4.2", "85.1", "92.5"]

new_float_value = [eval(z) for z in i]
print(new_float_value)

Here is the Screenshot of the following given code

Python string to list of floats
Python string to list of floats

By using for loop and split() method we can a string to a list of floats in Python

Source Code:

new_floa_str = "76.4 35.8 167.9"

emp_lis = []
for i in new_floa_str.split():
  emp_lis.append(float(i))

print(emp_lis)

In this example, we have created a list of items by space in a string, we can use the split() and along with use for loop to iterate each item in a given list. After that use float datatype to convert each item to a float number.

Screenshot:

Python string to list of floats
Python string to list of floats

Read How to convert a String to DateTime in Python

Python string to list array

  • Let us see how to convert a string to an array in Python.
  • To do this we can use the split() method and this method will help the user to split the elements as individually into list items. In the split() method you can specify the separator but in this example, by default, the separator is the white space.

Syntax:

Here is the Syntax of the split() method

String.split(separator, maxsplit)

Example:

Let’s take an example and check how to convert a string into an array

new_alpha = "Python is a best programming language"

new_array = new_alpha.split()
print(new_array)

In the above example, we have split the string by using a white space delimiter.

Output:

Python string to list array
Python string to list array

Read Python generate random number and string

Python string to list without split

  • Here we can see how to convert a string to a list without using split() method in Python.
  • The simplest way to break a string in Python, we can use the list slicing method. In the list slicing method first and last indexes are separated by a colon[:]. If we did not set the value for the first index then by default it takes 0 and the last index is set to the end element of the list.

Syntax:

list[start:stop:step]

Source Code:

new_character = "Micheal"

empty_list = []

empty_list[:] = new_character
print('Convert string to list:',empty_list)

Here is the execution of the following given code

Python string to list without split
Python string to list without split

This is how to split a string into a list without using the split() function in Python.

Read Python write String to a file

Python add string to list elements

  • In Python how to add a string into a list of elements, we can apply the append() function in Python, and this method will add new items to the end of a list.
  • In this example, we have specified a single item to add one string to a list and it does not return a new list but it will update the original list by inserting the element to the last of the list.

Source Code:

new_str_lis = ['a','z','x','c']

add_str = 'uveq'
new_str_lis.append(add_str)
print("list after appending string is:",new_str_lis)

In the above example first, we initialize a list and create a string ‘add_str’ which we have to add to a list. Appending string to a list we can use the method append() and this particular function add a string element to the last of a list without changing the list of characters.

Here is the execution of the following given code

Python add string to list elements
Python add a string to list elements

Read How to handle indexerror: string index out of range in Python

  • Here we can see how to extract substring from the given string in Python.
  • In Python, we can easily solve this task by using the slicing method. In this program, we have to access the sub-string of a string. A substring is a sequence of characters inside a string.
  • To extract a substring from a string in Python we can apply the string slicing method.

Syntax:

Here is the Syntax of the slice() method

slice(start,stop,step)

Note: This method consists of three parameters start, stop, step, and the slice object is inserted within the string variable.

Example:

ext_str = "oplrtwe"

new_slic =slice(2)
new_slic2 = slice(3)
print(ext_str[new_slic])
print(ext_str[new_slic2])

In the above example, we pass single integer value ‘2’ as an argument in the slice() constructor and the index value starts from 0.

Here is the execution of the following given code

Python string list extract substring
Python string list extract substring

Read How to convert list to string in Python

Python string split to list regex

  • Here we can see how to split a string based on the regex pattern in Python.
  • To split the string by regular expression we can use the re. split() method. In Python, the re.split() method returns a list of strings by comparing all circumstances of the given pattern in the string.
  • Regular expression uses the backslash character(‘\’) but in this example we use the underscore delimiter(‘_’).

Syntax:

Here is the Syntax of re.split() function

re.split(pattern, string, maxsplit=0, flags=0)
  • This method consists of four arguments.
    • Pattern: The regular expression pattern uses as a delimiter and it is also used for splitting the string.
    • String: The variables or words that you want to split from the list of strings.
    • Maxsplit: It is an optional parameter and by default, the maxsplit argument is 0.
    • flags: It is an optional flag and by default, no flags are required in this method.

Source Code:

import re

nw_string1 = "13__oliva,,eljiah,_john_,Micheal"
reg_exp_str = re.split('[_,][_,]',nw_string1)
print(reg_exp_str)

In the above code first, we have created a string ‘nw_string1’ and in this string, each word is separated by underscore and comma. Now this delimiter(‘_’) is used to break the string into substrings.

Output:

Python string split to list regex
Python string split to list regex

Read How to convert an integer to string in python

  • Let us see how to remove duplicates from a list string in Python.
  • You can remove duplicates from the list by using the set() method. In Python, the set() method cannot contain any duplicate values and this method will help the user to convert into a new list in which duplicate characters are removed.

Let’s take an example and check how the set() method can be used to remove duplicates from the list.

Source Code:

new_str = ['a','g','j','i','u','p','u','i','z']

rem_new_dup = list(set(new_str))
print(rem_new_dup)

In the above code first, we initialize a list called ‘new_str’ which contains alphabet characters. Now we declare a variable ‘rem_new_dup’ which stores the set() function and assign ‘new_str’ variable as an argument. This process deletes all duplicates from a given list.

Here is the execution of the following given code

Python string list remove duplicates
Python string list remove duplicates

  • You can also remove duplicates from the list by using dict.keys() method in Python. This method will always return a unique value. In Python, the dictionaries cannot contain duplicate values so that’s why we use dict.keys() method in this example.
  • The dict.keys() method will help the user to remove duplicate words or characters from the list.

Syntax:

Here is the Syntax of dict.keys() method

dict.fromkeys(keys,value)

Note: This method consists of two parameters key and value.

Example:

string =['john','micheal','australia','micheal','germany','george','john']

remove_dupli = list(dict.fromkeys(string))
print(remove_dupli)

In the above code first, we have created a string called ‘string’ which contains different countries’ names in the form of a string. Now use the dict.fromkeys() method to initialize a dictionary from the ‘string’ variable and then use the list() constructor to convert dict into a list.

Screenshot:

Python string list remove duplicates
Python string list remove duplicates

Read How to split a string using regex in python

Python string list index

  • Here we can see how to get index value from the list which contains string elements in Python.
  • By using the list index() method we can perform this task and it is an inbuilt function in Python that finds the elements from the start of the list.

Syntax:

Here is the Syntax of a list index() method

list.index(element, start, end)
  • It consists of a few parameters
    • element: This parameter specifies which element you want to get the index value.
    • Start: It’s an optional parameter and by default, its value is 0.
    • End: If you want to find the last index element then you can use this parameter.

Example:

student_name = ['George', 'James', 'Potter', 'Oliva']

new_ind = student_name.index('James')
print(new_ind)

In the above example, we have created a list ‘student_name’ which contains strings. Now I want to get the index value of ‘james’ to do this we apply the list.index() method and call the print statement to display the index value.

Here is the execution of the following given code

Python string list index
Python string list index

Read Python dictionary of tuples

Python string to list of tuples

  • Let us see how to convert a string to a list of tuples in Python.
  • The combination of iter() split() next() can be used to perform this particular task. In this example, we use the iterator object that contains a countable element and the next() method is used to fetch the next element from the collection.

Source Code:

new_val_str = "Java is a core programming language"

new_out = iter(new_val_str.split())

lis_of_tup = [(new_element, next(new_out)) for new_element in new_out]
print(lis_of_tup)

Here is the Output of the following given code

Python string to list of tuples
Python string to list of tuples

Read Python sort list of tuples

Python string to list of json

  • Here we can see how to convert a string to a list by importing JSON library in Python.
  • In this programm, we use the JSON.loads() method. In Python, the JSON.loads() method takes a JSON string as a parameter and it will return the list-objects.

Source Code:

import json
  
first_list1 = "[45,7,8,2,3,4]"
new_output = json.loads(first_list1)
print ("Convert string to list:", new_output)
Python string to list of json
Python string to list of JSON

Read Python concatenate tuples with examples

  • To remove whitespace in the list we can apply the replace() and append() method with for loop.
  • In this example, we have created a list “new_lis” which contains elements in the form of string. Now create an empty list and use for loop method to iterate items from the original list and then use replace() method for removing white space in a list.

Example:

new_lis = ['John', '   ', 'James ', 'Micheal', '  ', 'George']

new_output = []
for val in new_lis:
    m = val.replace(' ', '')
    new_output.append(m)

print(new_output)

Output:

Python string to list remove spaces
Python string to list remove spaces

Read Python square a number

Python string list to dataframe

  • Let us see how to convert a string into a list by using a dataframe in Python. To do this task first we import a pandas library in it.
  • In Python, the dataframe is a data structure in the form of rows and columns.

Here is the Screenshot and code of the CSV file

Note: This code is an input string you have to use in your CSV file

student_id|batch
23|"[batch3,batch8]"
24|"[batch7,batch18,batch78]"
19|"[batch65,batch34]"
Python string to list csv file
Python string to list CSV file

Here is the implementation of the string list to the dataframe.

Source code:

import pandas as pd

df = pd.read_csv('test1.csv', sep='|')
print(df)

In the above first we import a pandas library and then create a variable ‘df’ in which we have used the ‘read_csv’ function for importing a CSV file to dataframe format. In this method, we have assigned a ‘test.csv’ file as an argument.

Output:

Python string list to dataframe
Python string list to dataframe

Read Python print without newline

Python string list max length

  • Let us see how to find a maximum length in a string list in Python.
  • To perform this task we can use the inbuilt max() function with the “len” constructor as a key parameter and this method return the maximum string.

Source Code:

original_lis1 = ['Micheal', 'john', 'george', 'potter', 'james']

new_output = max(original_lis1, key = len)
print(new_output)

Here is the execution of the following given code

Python string list max length
Python string list max length

Python string list to byte array

  • To convert a string to a byte array we can simply pass the string as the first input and then pass the encoding ‘utf-8’ as a second parameter.
  • In this example first, we have created a string ‘count_str’ and then create a variable ‘new_array’ in which we have stores bytes() method and assign string as an argument.

Source Code:

count_str = "Germany"

new_array = bytes(count_str, 'utf-8')

for new_byte in new_array:
    print("Convert string to byte:",new_byte)

Here is the implementation of the following given code

Python string list to byte array
Python string list to byte array

Read Python naming conventions

Python string vs list

  • In Python, the list can store any data type while a string can only consist of characters.
  • In Python list can be easily declared by square brackets[] and a string is a sequence of characters within the single or double quotes.
  • In a list, data can be separated by a comma(,) and the data can be integer, float, and string. While the string is an immutable datatype.

Example:

Let’s take an example and check the main difference between string and list in Python

new_str = 'James' #create string

print("created string:",new_str)
my_new_list = [35,87,66] #create list

print("Created list:",my_new_list)

Here is the execution of the following given code

Python string vs list
Python string vs list

You may like the following Python tutorials:

In this Python tutorial, you will learn about Python String to list. Let us see how to convert Python string to list and also we will cover the below examples:

  • Python string to list of characters
  • Python string to list conversion
  • Python string to list with separator
  • Python string to list of words
  • Python string to list split
  • Python string to list of ints
  • Python string to list with spaces
  • Python string to list newline
  • Python string to list of dictionaries
  • Python string to list of strings
  • Python string to list by delimiter
  • Python string to list of floats
  • Python string to list array
  • Python string to list without split
  • Python add string to list elements
  • Python string list extract substring
  • Python string split to list regex
  • Python string list remove duplicates
  • Python string list index
  • Python string to list of tuples
  • Python string to list of json
  • Python string to list remove spaces
  • Python string list to dataframe
  • Python string list max length
  • Python string list to byte array
  • Python string vs list
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3 hours ago · UUID generator. Online conversion of a GUID/UUID to/from base64 This is just simple page that I wrote so I could see the text version of a base64-encoded GUID/UUID. The ability to insert an ID in hex text and convert it to binary would be a must too. - GitHub - AjaxGb/mc-uuid-converter: Convert between the different Minecraft UUID formats.

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In this post, we are going to convert a string to ArrayList using Java code. The string is a sequence of characters and a class in Java while the ArrayList is an implementation class of list interface.. Suppose, we have a URL string that consists of a server resource path and separated by some separate symbols, and we want to get it as ArrayList.So, we need to perform this conversion.

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instantly convert your text list to array; valid for JS, PHP, PERL, PYTHON (as list) and much more. [ your text list here ] Is your list ready? In the need to optimize your list (remove duplicates, empty lines, sort, prefix and suffix, etc.) use KitTxt before. convert. quotes. Double.

Convert an Array to a List in C#

20-11-2016 · This post will discuss how to convert an array to a list in C#. 1. Using Enumerable.ToList () method. The simplest solution is to call the Enumerable.ToList () method from System.Linq namespace which creates a List<T> from an IEnumerable<T>. It returns a List<T> that contains elements from the input sequence. 2. Using List Constructor.

20-11-2016

This post will discuss how to convert an array to a list in C#.

1. Using Enumerable.ToList() method

The simplest solution is to call the Enumerable.ToList() method from System.Linq namespace which creates a List from an IEnumerable. It returns a List that contains elements from the input sequence.

using System.Collections.Generic;
    public static void Main()
        int[] array = { 1, 2, 3, 4, 5 };
        List<int> list = array.ToList();
        // List list = array.OfType().ToList();
        // List list = array.Cast().ToList();
        Console.WriteLine(String.Join(",", list));

Download  Run Code

2. Using List Constructor

We can also use the constructor of List which accepts IEnumerable as an argument and initializes a new instance of the List class that contains elements copied from the specified collection.

using System.Collections.Generic;
    public static void Main()
        int[] array = { 1, 2, 3, 4, 5 };
        List<int> list = new List<int>(array);
        Console.WriteLine(String.Join(",", list));

Download  Run Code

3. Using List.AddRange() method

Finally, we can call the AddRange() method, which adds the specified collection elements at the end of the List.

using System.Collections.Generic;
    public static void Main()
        int[] array = { 1, 2, 3, 4, 5 };
        List<int> list = new List<int>();
        Console.WriteLine(String.Join(",", list));

Download  Run Code

That’s all about converting an array to a list in C#.


Thanks for reading.

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To convert a given binary string into an integer, we use Convert.ToInt32(String, Base/Int32) method. just use .NET's built-in BCL Convert.ToString method. 3) look up the hex digits into the table from 1. Return the res string. In this program, we are calling a function to binary in main(). A floating-point binary value is a number, whereas a ...

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With a team of extremely dedicated and quality lecturers, c# convert string to decimal will not only be a place to share knowledge but also to help students get inspired to explore and discover many creative ideas from themselves.Clear and detailed training . In each iteration store ASCII value of character in variable val and then convert it into binary number and store result in array finally print the array in reverse order. Solution 3. Binary to decimal conversion table. 0. c# code to convert decimal to binary . On paper, this is not too exciting. Created for developers by developers from team Browserling . Load a string, get its binary representation. Hot Network Questions jonnin (10482) one algorithm to go to-binary is (for 1 - byte ascii chars): 1) make a lookup table of the 4 bit binary numbers (0-15) 2)convert the integer value to hex using int to string tools in the language. c# to binary . Convert a char * [] to a string in C. 0. 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One way to convert a character string representing a binary number is to use the function strtol with specifiying base 2 for the character string. But in a computer, it allows us to convert binary numbers to binary strings. 在java中将base64字符串转换为字节码[重复](convertbase64StringtoBytecodeinjava[duplicate]),可能重复:DecodeBase64datainjava我正在研究java配置 . In this tutorial, we will be discussing a program to convert string into Binary sequence. For this we will be provided with a string of characters. Hexadecimal number in computers is represented with base 16 and binary number is represented with base 2 as it has only two binary digits 0 and 1 whereas hexadecimal number have digits starting from 0 - 15 in which 10 is represented as A, 11 as B, 12 as C, 13 as D, 14 as E and 15 as F. The program is created using following approaches: Decimal to Binary using Array; Without using Array; Using user-defined Function; Some extra programs are also available. And the user enters in a bunch on letters they hit the button and then it makes it into binary digits that are printed out in a different text box. Hey there, I would like to convert a String to a String of binary code at runtime. Given with hexadecimal number as an input, the task is to convert that hexadecimal number into a binary number. Syntax: Convert.ToInt32(String, Base/Int32); Here, String is a String object that should contain a binary value and Base/Int32 is an integer type of object which specifies the base of the input string. Here's the code that I'm working with, if anyone can see what . Sometimes it's useful to output the binary representation of a number in text, i.e. Convert ASCII to binary in C : The following c program asciiValueToBinary () function converts ASCII value of all characters from '0' to '~' into equivalent binary value. 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Convert a char * [] to a string in C. 0. stoi() stands for string to integer, it is a standard library function in C++ STL, it is used to convert a given string in various formats (like binary, octal, hex or a simple number in string formatted) into an integer.

Convert List to ArrayList in Java

List<String> MyList = (List<String>) Arrays.asList("Hello","World"); } } The above List contains two string elements, as you can see. Here, Arrays.asList is a static method used to convert an array of objects into a List. Let’s see how we can have this List convert into an ArrayList. Learn more about Array Class here. import java.util ...

In this guide, we have talked about how you can convert a list to an ArrayList in Java. But before we go into it, you should be familiar with some of the basic concepts in Java. You need to understand that list is implemented by the Interface Collection, and ArrayList is an implemented class of List.

Converting List to ArrayList in Java

Let’s take a look at the example down below.

import java.util.*;
public class Hello 
{
    public static void main(String[] args)
    {
        //Let's make a List first. 
        List  MyList = (List) Arrays.asList("Hello","World");
    }
}

The above List contains two string elements, as you can see. Here, Arrays.asList is a static method used to convert an array of objects into a List. Let’s see how we can have this List convert into an ArrayList.

Learn more about Array Class here.

import java.util.*;
public class Hello 
{
    public static void main(String[] args)
    {
        //Let's make a List first. 
        List  MyList = (List) Arrays.asList("Hello","World");
        ArrayList a1 = new ArrayList(MyList);
    }
}

With this approach, we are actually initializing the ArrayList featuring its predefined values. We simply made a list with two elements using the Arrays.asList static method. Later we used the constructor of the ArrayList and instantiated it with predefined values. Learn more about ArrayList and its methods and other properties.

In other words, we had an array with elements in it and converted it into List and later turned that list into an ArrayList. Take a look at the example down below for understanding what’s happening.

import java.util.*;
public class Hello 
{
    public static void main(String[] args)
    {
        String arr[]={"1","2","3"};
        List  MyList = (List) Arrays.asList(arr);

        //now we are converting list into arraylist
        ArrayList a1 = new ArrayList(MyList);
        for(int i=0; i

In the above program, we first made an Array with initializing values. Later, just like in the first example, instead of giving values, we passed an array, and we used Arrays.asList to convert this array of objects into a List.

The list that you get from Arrays.asList is not modifiable. It’s just a wrapper, and you can’t add or remove over it. Even if you try, you will get

UnsupportedOperationException

The problem here is to convert the list into an ArrayList, so we instantiated the ArrayList from the List. The output of the above program:

1
2
3

That’s how you convert the List into an ArrayList in Java.

DelftStack is a collective effort contributed by software geeks like you. If you like the article and would like to contribute to DelftStack by writing paid articles, you can check the write for us page.

Related Article - Java List

Convert an Array to a List in JavaConcatenate List in JavaReturn an ArrayList in JavaConvert an Arraylist to a String in Java
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convert array key value to string javascript. GOAL. This is how we can transform the array data structure in . For example, this chain ultimately converts from a ByteArray to Inpu

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Tip In this case, you can use the List constructor or imperative copying of elements in loops. Module Module1 Sub Main () ' Create a list and add three elements to it. Dim list As List (Of Integer) = New List (Of Integer) list.Add ( 1 ) list.Add ( 2 ) list.Add ( 3 ) ' Convert the list to an array. Dim array As Integer () = list.

VB.NET Convert List and ArrayConvert Lists and arrays with the ToArray and ToList Functions.

Convert List, array. Lists and arrays are often converted. Both the List and array types in the VB.NET language are useful. But sometimes we require the opposite type. We do this with the extension methods ToArray and ToList.

Example. Initially, this example creates a new List of Integer types and then adds three elements to it. Then, it invokes the ToArray extension method on that collection and assigns the result to a new reference local variable of array type.

Integer

Next It invokes the ToList Extension on the array and assigns the result to another List variable.

Program This shows how any List and array of equivalent element type can be converted back and forth.

ToList

Newer Frameworks required. The ToArray and ToList extension methods are part of the System.Linq namespace in the .NET Framework. This namespace was introduced in .NET 3.5. If you target an older Framework, this example will not work.

Tip In this case, you can use the List constructor or imperative copying of elements in loops.

List

VB.NET program that uses ToArray and ToList

Module Module1 Sub Main() ' Create a list and add three elements to it. Dim list As List(Of Integer) = New List(Of Integer) list.Add(1) list.Add(2) list.Add(3) ' Convert the list to an array. Dim array As Integer() = list.ToArray Console.WriteLine(array.Length) ' Convert the array to a list. Dim list2 As List(Of Integer) = array.ToList Console.WriteLine(list2.Count) End Sub End Module3 3

Summary. We invoked the ToArray and ToList extension methods to declaratively and clearly convert between list and array types in the VB.NET language. We described the limitations of these methods. They must receive compatible element types.

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How to get ArrayList<String> to ArrayList<Object> and vice ...

Create/Get an ArrayList object of String type. Create a new ArrayList object of Object type by passing the above obtained/created object as a parameter to its constructor. Example

JavaObject Oriented ProgrammingProgramming

Instead of the typed parameter in generics (T) you can also use “?”, representing an unknown type. These are known as wild cards you can use a wild card as − Type of parameter or, a Field or, a Local field. Using wild cards, you can convert ArrayList to ArrayList as −

ArrayList stringList = (ArrayList)(ArrayList)(list);

Example

 Live Demo

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
public class ArrayListExample {
   public static void main(String args[]) {
      //Instantiating an ArrayList object
      ArrayList list = new ArrayList();
      //populating the ArrayList
      list.add("apples");
      list.add("mangoes");
      list.add("oranges");
      //Converting the Array list of object type into String type
      ArrayList stringList = (ArrayList)(ArrayList)(list);
      //listing the contenmts of the obtained list
      Iterator it = stringList.iterator();
      while(it.hasNext()) {
         System.out.println(it.next());
      }
   }
}

Output

apples
mangoes
oranges

ArrayList to ArrayList

To convert the ArrayList to ArrayList −

  • Create/Get an ArrayList object of String type.

  • Create a new ArrayList object of Object type by passing the above obtained/created object as a parameter to its constructor.

Example

 Live Demo

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
public class ArrayListExample {
   public static void main(String args[]) {
      //Instantiating an ArrayList object
      ArrayList stringList = new ArrayList();
      //populating the ArrayList
      stringList.add("apples");
      stringList.add("mangoes");
      stringList.add("oranges");
      //Converting the Array list of String type to object type
      ArrayList objectList = new ArrayList(stringList);
      //listing the contents of the obtained list
      Iterator it = stringList.iterator();
      while(it.hasNext()) {
         System.out.println(it.next());
      }
   }
}

Output

apples
mangoes
oranges
raja

Published on 14-Oct-2019 07:26:33

Convert an ArrayList of String to a String array in Java

Convert an ArrayList of String to a String array in Java - At first, let us set an ArrayList of string −ArrayList<String> arrList = new ArrayList<String>(); a ...

Java 8Object Oriented ProgrammingProgramming

At first, let us set an ArrayList of string −

ArrayList arrList = new ArrayList();
arrList.add("Bentley");
arrList.add("Audi");
arrList.add("Jaguar");
arrList.add("Cadillac");

Now, use toArray() to convert to a string array −

int size = arrList.size();
String res[] = arrList.toArray(new String[size]);

Example

Following is the program to convert an ArrayList of String to a String array in Java −

import java.util.*;
public class Demo {
   public static void main(String[] args) {
      ArrayList arrList = new ArrayList();
      arrList.add("Bentley");
      arrList.add("Audi");
      arrList.add("Jaguar");
      arrList.add("Cadillac");
      arrList.add("Mazda");
      arrList.add("Land Rover");
      arrList.add("Porsche");
      int size = arrList.size();
      String res[] = arrList.toArray(new String[size]);
      System.out.println("String Array...");
      for(String s: res) {
         System.out.println(s);
      }
   }
}

Output

String Array...
Bentley
Audi
Jaguar
Cadillac
Mazda
Land Rover
Porsche
raja

Published on 25-Sep-2019 08:02:17

dotnetperls.com

List to array. Here we convert a string List into a string array of the same number of elements. At the end, the program prints the array's length. Step 1 We create a List and populate it with some strings. The List here can only hold strings (or null). Step 2 Next we use ToArray on the List.

C# Convert List to ArrayUse the ToArray and ToList methods to convert Lists and arrays.

Convert List, array. A List can be converted to an array. The opposite conversion is also possible. In each conversion, the element types remain the same—strings remain strings.

404 image

More complex methods can be implemented. A for-loop can copy elements from a List and add them to an array. But this is more work for the programmer.

List to array. Here we convert a string List into a string array of the same number of elements. At the end, the program prints the array's length.

Step 1 We create a List and populate it with some strings. The List here can only hold strings (or null).

List

Step 2 Next we use ToArray on the List. To test it, we pass the string array to the Test() method.

ToArray

Array

404 image

C# program that converts List to array

using System; using System.Collections.Generic; class Program { static void Main() { // Step 1: create list. List list = new List(); list.Add("one"); list.Add("two"); list.Add("three"); list.Add("four"); list.Add("five"); // Step 2: convert to string array. string[] array = list.ToArray(); Test(array); } static void Test(string[] array) { Console.WriteLine("Array received: " + array.Length); } }Array received: 5
Array to List. We can convert an array of any number of elements to a List that has the same type of elements. There are 3 parts to this example.

Part 1 Here we initialize a new string array containing 5 strings. These are specified as string literals.

Part 2 Here we convert the array to a List with the List constructor. This returns a new List of strings.

Part 3 Here the example converts the array to a List with the ToList() instance method.

C# program that uses List constructor and ToList

using System; using System.Collections.Generic; using System.Linq; class Program { static void Main() { // Part 1: string array. string[] array = new string[] { "one", "two", "three", "four", "five" }; // Part 2: use list constructor. List list1 = new List(array); Test(list1); // Part 3: use ToList method. List list2 = array.ToList(); Test(list2); } static void Test(List list) { Console.WriteLine("List count: " + list.Count); } }List count: 5 List count: 5
Implicit conversion error. You may get the "Cannot implicitly convert type" error. This error raised by the compiler tells you that the type needs a regular cast or is not compatible.

Note If your code statement tries to assign a List to an array, you will get this error.

C# program that causes convert type error

using System.Collections.Generic; class Program { static void Main() { List items = null; int[] result = new int[0]; // This does not work. items = result; } }Error CS0029 Cannot implicitly convert type 'int[]' to 'System.Collections.Generic.List'
Notes, ToList. The ToList method is an extension method from System.Linq. This kind of method is an addition to normal C# method calls.

ToList

Extension

Readability. It is easy to remember that ToList converts a collection to a List, and ToArray does the same for an array. These methods are well-named.

A summary. Convert arrays to Lists (and lists to arrays) with this code. We can not just as sign one to the other. The List constructor can also be used—and it avoids a null check).

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Then we set IFS to set of delimiters ,, (, ), ] and [ with IFS=', ()] [' which means our input string can be delimited with one-or-more of these delimiters. Next read -r -a array reads and split the line into an array called array only based on defined IFS above from input string passed in …

thedeveloperblog.com

Scala program that converts List to array val colors = List("blue", "yellow", "red") // Convert list to array. val result = colors.toArray // Print list. println(colors) // Print length and elements of the array. println(result.length) result.foreach(println(_)) Output List(blue, yellow, red) 3 blue yellow red