Setting own class as key in java Hashmap

Question

I have a class which I want to set up as keys in HashMap. I already have implemented the compareTo method for that class. But still when I do:

map.put(new MyKey(d         


        

Answer 1

You need to implement hashCode() and equals(). compareTo() is additionally required for sorted map/set.

See this question for details.

Answer 2

HashMap doesn't check compareTo();

HashMap checks hashCode() and equals().