hashmap - how can i change the hash code of java class? -

my doubt is, have employee class contains 2 variable id , name follows:

public class empbean {   int id=10;;   string name="uday"; } 

i have added object hashmap follows:

hashmap<empbean, empbean> hashmap= new hashmap<empbean, empbean>(); hashmap.put(empbean, empbean); 

then:system.out.println(hashmap.get(empbean).id);

output:10;

when call get() method of hashmap,it calculates hashcode , apply hashing on , finds bucket , returns value.

so far fine.

if want change hash code of object before calling get() method. how can ? tried empbean.id=2000; there no change in hashcode.

if change value in object witch in hashmap must first remove item hashmap edit value , after insert hashmap again.