How to remove whitespaces from string in Java

package com.javadoc;

/**
* This class is used to remove whitespaces from string.
* @author javadoc
* @version 1.0
* @since 1.8
*/
public class RemoveWhitespaces {
   /**
   * This method remove whitespaces from string.
   * @param str String to remove whitespaces.
   * @return String Obtains the string without whitespaces.
   */   
   public String removeWhitespaces(String str) {
       //Variable to store the string without whitespaces
       String strWithoutSpaces = "";
       //Remove whitespaces from string
       strWithoutSpaces = str.replaceAll("\\s", "");
       //Return the string without whitespaces
       return strWithoutSpaces;
   }

   /**
   * One Example
   */
   public static void main(String args[]) throws IOException {

      RemoveWhitespaces  removeWhitespaces= new RemoveWhitespaces ();
      //Example
      String strWithoutSpaces = removeWhitespaces.removeWhitespaces("Hello World");
      //Output
      System.out.println("String without whitespaces :" + strWithoutSpaces); //HelloWorld
   }
}