Java - TreeSet and hashCode()

Question

I have a quick question about TreeSet collections and hashCode methods. I have a TreeSet and I\'m adding objects to it, before I add an object, I check to see i

Answer 1

From Java Doc:

If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.

Means: the objects you use for hashing are not equal.