TL;DR: I made a hashmap object with my own "Pair" class objects to be used as Keys. When I use hashmap.containsKey(Pair), it fails to find the key.TL;DR: I made a hashmap object with my own "Pai
阅读背景：
HashMap.containsKey（key）无法找到键，自定义类用作键类型
来源：互联网
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