How to remove all whitespace from String in Java?

Java Object Oriented Programming Programming

In this article, we will learn how to remove all whitespace from a string in Java. For example, if the given string contains white spaces as shown below -

Initial String = "Hi how are you Welcome to Tutorialspoint.com"

The output should contain a string without white spaces as -

String without whitespaces = "HihowareyouWelcometoTutorialspoint.com"

Using replaceAll() Method

The replaceAll() method replaces substrings that match a given regular expression with a specified string. By passing white spaces and an empty string as parameters to this method, we can remove all whitespaces from the input string.

Steps to remove whitespaces from a string

The following are the steps to remove whitespaces from a string using the replaceAll() method:

Create a string containing some whitespaces.
Use the replaceAll() method to replace spaces with an empty string.
Print the output string to display the result without whitespaces.

Example

The following is an example of removing all whitespaces from a string using the replaceAll() method:

import java.io.*;
public class Test {
   public static void main(String args[]) {
      String Str = new String("Hi how are you Welcome to Tutorialspoint.com");
      System.out.print("Return Value :" );
      System.out.println(Str.replaceAll(" ", ""));
   }
}

Following is the output of the above program -

Return Value :HihowareyouWelcometoTutorialspoint.com

Using replace() Method

Now, let's see how to remove all whitespaces from a string in Java using the replace() method. This method replaces all occurrences of a specified character with another character or an empty string.

Steps to remove whitespaces from a string

The following are the steps to remove whitespaces from a string using the replace() method:

Create a string containing some whitespaces.
Use the replace() method to replace spaces with an empty string.
Print the output string to display the result without whitespaces.

Example

The following is an example of removing all whitespaces from a string using the replace() method:

import java.io.*;
public class Test {
   public static void main(String args[]) {
      String Str = new String("Hi how are you Welcome to Tutorialspoint.com");
      System.out.print("Return Value :" );
      System.out.println(Str.replace(" ", ""));
   }
}

Following is an output of the above program -

Return Value :HihowareyouWelcometoTutorialspoint.com

Using Streams

We can also remove all whitespaces from a string using Java Streams. This approach allows us to process the string in a functional programming.

Steps to remove whitespaces from a string

The following are the steps to remove whitespaces from a string using Streams:

Create a string containing some whitespaces.
Convert the string to a stream of characters.
Filter out the whitespace characters.
Collect the remaining characters into a new string.
Print the output string to display the result without whitespaces.

Example

The following is an example of removing all whitespaces from a string using Streams:

import java.util.stream.Collectors;
public class Test {
   public static void main(String args[]) {
      String Str = new String("Hi how are you Welcome to Tutorialspoint.com");
      String result = Str.chars()
                         .filter(c -> !Character.isWhitespace(c))
                         .mapToObj(c -> String.valueOf((char) c))
                         .collect(Collectors.joining());
      System.out.print("Return Value :" );
      System.out.println(result);
   }
}

Following is the output of the above program -

Return Value :HihowareyouWelcometoTutorialspoint.com

Aishwarya Naglot

Writing clean code… when the bugs aren’t looking.

Updated on: 2025-06-24T13:03:06+05:30

8K+ Views

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