[LANG-1464] Hash Collision on Pair<> with auto-boxing type.

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: lang.tuple.*
• Labels: performance
• Assignee: Unassigned
• Reporter: Shiang-Yun
• Created: 12/Jun/19 06:52
• Updated: 12/Jun/19 14:13

Description

I create 1 million objects with Integer pair. But, the total number of the pair hash kinds is 1024.

    public static void main(String[] args) {
        Set<Integer> set = new TreeSet<>();
        for (int i = 0; i < 1000; i++) {
            for (int j = 0; j < 1000; j++) {
                Pair<Integer, Integer> intPair = Pair.of(i, j);
                set.add(intPair.hashCode());
            }
        }

        System.out.printf("%d", set.size());
    }

I think the Pair.hashCode need to write more complex.