Sunday, February 22, 2009

sample code to demonstrate HashSet class



package collection;

import java.util.HashSet;

public class HashSetDemo {
public static void main(String arg[])
{
HashSet h=new HashSet();
System.out.println(h.add("b")); // true
h.add("b");
h.add("c");
h.add("d");
h.add(null);
h.add(new Integer(10));
System.out.println(h.add("d")); // flase
System.out.println(h); // depends on hash code number insertion order.
}
}


output:
true
false
[d, null, c, 10, b]



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