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Editorial Team
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Asked: 2026-05-14T18:25:43+00:00

As simple as this must be I still can’t understand where am I wrong:

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As simple as this must be I still can’t understand where am I 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 in order to get uniqueness?

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1 Answer

  1. Editorial Team

    hashCode, as you would with Java

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