How to Remove all White Spaces from a String in Java?

How to Remove all White Spaces from a String in Java?

Last Updated : 21 Nov, 2024

In Java, to remove all white spaces from a String, there are several ways like using replaceAll() or manual iteration over characters. In this article, we will learn how to remove all white spaces from a string in Java.

Example:

We will use the replaceAll() method with the regex pattern "\\s" to remove all whitespaces from a string. This is the most efficient and concise method.

Java

// Java program to remove all white spaces 
// from a string using replaceAll() method

class BlankSpace {
    
  public static void main(String[] args) {
        
    String s = "     Geeks     for Geeks     "; 

        // Call the replaceAll() method to remove all white spaces
        s = s.replaceAll("\\s", "");

        System.out.println(s); 
    }
}

Output

GeeksforGeeks

Table of Content

Other Methods to Remove White Spaces from a String

Using Character Class Built-in Function
Using String.replace() Method
Using Java 8 Streams

Other Methods to Remove White Spaces from a String

Apart from the simple method mentioned above, there are few more methods available to remove all white spaces from a string in Java.

1. Using Character Class Built-in Function

In this case, we are going to declare a new string and then simply add every character one by one ignoring the white space. For this, we will use Character.isWhitespace(c).

Example:

Java

// Java program to demonstrate how to remove all white spaces from a string 

import java.io.*;
import java.util.*;

class GFG {

    public static void main(String[] args)
    {
        String s = "    Geeks     for Geeks     ";
        String a = "";

        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);

            // Checking whether is white space or not
            if (!Character.isWhitespace(c)) {
                a += c;
            }
        }
        System.out.println(a);
    }
}

Output

GeeksforGeeks

2. Using String.replace() Method

The replace() method replaces all occurrences of a space (" ") in the string with an empty string ("") by effectively removing all white spaces.

Example:

Java

// Java program to demonstrate how to remove all white spaces from a string 
// using the String.replace() method
import java.io.*;
import java.util.*;

class GFG {

    public static void main(String[] args)
    {
        String s = "    Geeks     for Geeks     ";
        String a = s.replace(" ","");
      
        System.out.println(a);
    }
}

Output

GeeksforGeeks

3. Using Java 8 Streams

Java 8 introduced Streams, which can also be used to remove white spaces by filtering characters.

Example:

Java

// Java program to demonstrate how to remove all white spaces from a string 
// using Java 8 Streams
import java.io.*;
import java.util.*;
import java.util.stream.Collectors;

class GFG {

    public static void main(String[] args)
    {
        String s = "    Geeks     for Geeks     ";
        String a = s.chars()
        .filter(c -> !Character.isWhitespace(c))
        .mapToObj(c -> String.valueOf((char) c))
        .collect(Collectors.joining());

        System.out.println(a);
    }
}

Output

GeeksforGeeks

How to Remove all White Spaces from a String in Java?

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