1. import java.util.*;2. public class WrappedString {3.   private String s;4.   public WrappedString(String s) { this.s = s; }5.   public static void main(String[] args) {6.    HashSet < Object > hs = new HashSet < Object > ();7.    WrappedString ws1 = new WrappedString("aardvark");8.    WrappedString ws2 = new WrappedString("aardvark");9.    String s1 = new String("aardvark");10.    String s2 = new String("aardvark");11.    hs.add(ws1); hs.add(ws2); hs.add(s1); hs.add(s2);12.    System.out.println(hs.size()); 13.   }14. }