java - 如何恢复到原来的哈希码？

Question

在java中，如果hashcode方法已经被重写，我们如何获取对象的原始hashcode值？

Answer 1

您可以使用System.identityHashCode(Object)方法。

Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode(). The hash code for the null reference is zero.