import java.util.IdentityHashMap; import java.util.Map; public class Main { public static void main(String[] argv) throws Exception { Map objMap = new IdentityHashMap(); Object o1 = new Integer(123); Object o2 = new Integer(123); objMap.put(o1, "first"); objMap.put(o2, "second"); Object v1 = objMap.get(o1); // first Object v2 = objMap.get(o2); // second } }