title: Clone() in java
body: <pre><code>import java.util.*;
  import java.lang.*;
  
  public class Test{
      public static void main(String[] argv){
          String s1="abc";
          String s2=(String) s1.clone();
      }    
  }
  </code></pre>
  
  <p>Why this simple test program doesn't work?</p>