How To Use Groovy Set For Unique Items?

Question

Simpler as it should be, I still can't figure out where I am going wrong:

class A {
    boolean equals(o) { true }
}
def s = [new A(), new A()] as Set
assert s.size() == 1 // Assertion failed: actually gives 2

Which method should I override to get uniqueness?

+2

Guy Gavriely Apr 29. 10 at 19:15

1 answer

tim_yates · Accepted Answer · 2010-04-29T21:52:28+0000

hashCode , as with Java

class A {
    boolean equals(o) { true }
    int hashCode() { 1 }
}
def s = [new A(), new A()] as Set
assert s.size() == 1