public class HashSetTest
{
public static void sop(Object obj)
{
System.out.println(obj);
}
public static void main(String[] args)
{
HashSet hs = new HashSet();
Person p1 = new Person("a1",11);
Person p2 = new Person("a2",12);
Person p3 = new Person("a3",13);
Person p4 = new Person("a1",11);