Changing an object which is used as a Map key

Question

Let V be a class with a single attribute named K and its getter and setters.

What\'s supposed to happen if I do:

V v = new V();
v.setK(\"a\");
HashMa         


        

Answer 1

V v = new V();
v.setK("a");
HashMap map = new HashMap();
map.put(v.getk(),v);

//Nothing will change in the hashmap with this step
v.setK("b");

but the problem will be while fetching the object V from map. If you call map.get(v.getk()), you will get null because the value in the map is mapped with object "a". However, since this String "a" is inter you can always fetch this object from map by map.get("a"); or

V v = new V();
v.setK("a");
map.get(v.getK());

PS: I have not tried to run this