Algorithm

  1. Input String: Take the input string that contains whitespaces.

  2. Remove Whitespace Method: Create a method (removeWhitespaces) that takes a string as input and uses the replaceAll method with the regular expression \\s to replace all whitespaces with an empty string.

  3. Display Result: Display the original string and the modified string without whitespaces.

 

Code Examples

#1 Code Example- Java Program to Remove All Whitespaces

Code - Java Programming

public class Whitespaces {

    public static void main(String[] args) {
        String sentence = "T    his is b  ett     er.";
        System.out.println("Original sentence: " + sentence);

        sentence = sentence.replaceAll("\\s", "");
        System.out.println("After replacement: " + sentence);
    }
}
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Output

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Original sentence: T his is b ett er.
After replacement: Thisisbetter.

#2 Code Example-Take string from users and remove the white space

Code - Java Programming

import java.util.Scanner;

class Main {
  public static void main(String[] args) {

    // create an object of Scanner
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter the string");

    // take the input
    String input = sc.nextLine();
    System.out.println("Original String: " + input);

    // remove white spaces
    input = input.replaceAll("\\s", "");
    System.out.println("Final String: " + input);
    sc.close();
  }
}
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Output

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Enter the string
J av a- P rog ram m ing
Original String: J av a- P rog ram m ing
Final String: Java-Programming
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Demonstration

Java Programing Example to Remove All Whitespaces from a String-DevsEnv