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tongyingrui avatar tongyingrui commented on May 18, 2024 1

这个Person类应该是重写了hashCode方法的,比如最简单的,

@Override hashCode() { return age; }

这样在p3修改了age之后对于hashset来说就变成另一个元素了,当然remove不掉,再添加时也会认为是另一个元素所以size会变成4

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lianyuchen avatar lianyuchen commented on May 18, 2024

image
image
我这边试的demo也是可以remove掉

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qiongtony avatar qiongtony commented on May 18, 2024

我用的Eclipse也可以remove掉,求解答

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CodeJiang avatar CodeJiang commented on May 18, 2024

重写了equals 和hashCode方法吗? hashset的内部实现用的是hashmap. hashmap判定是 通过 是否是同一个对象 && hashcode相等. 或者 equals方法相等.

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Poney1 avatar Poney1 commented on May 18, 2024

remove 对象的地址,

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