MyKey key = new MyKey("shreyansh"); //assume hashCode=1234
myHashMap.put(key, "value");

// Below code will change the key hashCode() and equals()
// but it's location is not changed.
key.setName("jogi"); //assume new hashCode=7890

//below will return null, because HashMap will try to look for key
//in the same index as it was stored but since key is mutated,
//there will be no match and it will return null.
myHashMap.get(new MyKey("shreyansh"));