How to remove the white spaces in Java

Problem Description

How to remove the white spaces?

Solution

Following example demonstrates how to remove the white spaces with the help matcher.replaceAll(stringname) method of Util.regex.Pattern class.

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
   public static void main(String[] argv) { 
      String str = "This is a Java program. This is another Java Program.";
      String pattern="[\\s]";
      String replace = "";
      Pattern p = Pattern.compile(pattern);
      Matcher m = p.matcher(str);
      str = m.replaceAll(replace);
      System.out.println(str);  
   }
}

Result

The above code sample will produce the following result.

ThisisaJavaprogram.ThisisanotherJavaprogram.

The following is an example to remove the white spaces.

import java.util.Scanner ;
import java.lang.String ;

public class Main {
   public static void main (String[]args) { 
      String s1 = null; 
      Scanner scan = new Scanner(System.in);
      System.out.println("Enter your string\n");
      s1 = scan.nextLine();
      System.out.println("Input String is  :\n"+s1);
      String s2 = s1.replaceAll("\\s+","");
      System.out.println("\n Output String is  :\n"+s2);
   }
}

The above code sample will produce the following result.

Enter your string

sairamkrishna mammahe
Input String is  :
sairamkrishna mammahe

Output String is  :
sairamkrishnamammahe