title: Change string in Java
body: <p>I want to send a string to a method and change the string there.
  The method should return void.
  Example:</p>
  
  <pre><code>String s = "Hello";
  ChangeString(s);
  
  String res = s;
  //res = "HelloWorld"
  -------------------------------------------
  
  private void ChageString(String s){
  s = s + "World";
  }
  </code></pre>
  
  <p>How can I do it in Java?
  Can it be done without adding another class?</p>
  
  <p>Thanks!
  PB</p>