Java tutorial
import java.util.IdentityHashMap; import java.util.Map; public class Main { public static void main(String[] argv) throws Exception { IdentityHashMap<Object, Object> objMap = new IdentityHashMap<Object, Object>(); Object o1 = new Integer(123); Object o2 = new Integer(123); objMap.put(o1, "first"); objMap.put(o2, "from java2s.com"); Object v1 = objMap.get(o1); System.out.println(v1); Object v2 = objMap.get(o2); System.out.println(v2); System.out.println(objMap); } }