To get duplicate key we use Identity HashMap with Example?

To identify duplicate keys in Identity HasMap JVM uses (==).

PROGRAM:
                  class DuplcateKeys{
                    IdentityHashMap ihm=new IdentityHashMap();
                   ihm.put("10", "BHaskar");
                   ihm.put("10","Ajantha");
                    System.out.println(ihm);

                              }

OUTPUT:
          {10 : Bhaskar,  10:Ajantha}

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