IdentityMapDemo

package com.srini.collections;

import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;

public class IdentityMapDemo {
public static void main(String[] args) {
Map identityMap = new IdentityHashMap();
Map hashMap = new HashMap();
identityMap.put("a", 1);
identityMap.put(new String("a"), 2);
identityMap.put("a", 3);
hashMap.put("a", 1);
hashMap.put(new String("a"), 2);
hashMap.put("a", 3);
System.out.println("Identity Map KeySet Size :: " +  identityMap.keySet().size());
System.out.println("Hash Map KeySet Size :: " + hashMap.keySet().size());
}
}