Question

I am working on a project that involves me using a HashSet of a class I made, which I will name Test. I defined the stated HashSet like so:

HashSet<Test> t = new HashSet<Test>();
t.add(new Test("asdf", 1));
t.add(new Test("hello", 2));
t.add(new Test("hello", 3));

I tried using

t.contains(new Test("asdf", 1));

but it returns false. However, when I use a HashSet<Character> it seems to work fine. I tried overriding the previous equals declaration, but it didn’t work. I tried leaving equals alone, but i still got false. I need to know what i am doing wrong?

also, i did not edit the hash function, i only changed Test.equals(Object o). It’s a simple project and since the java documentation states that it uses o.equals(this), i thought i would not have to.

Answer 1

You might have to overload the hashCode() method as well.