Difficulty writing equals when extending an instantiable class that already overrides equals .

当扩展已经Override了equals的instantiable类时很难编写equals 。

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The "obvious" ways to define equals when extending an instantiable class that already overrides equals all fail to meet the symmetry or transitivity requirements of the equals method.

当扩展已经Override了equals的instantiable类时，定义equals的“显而易见的”方式都不能满足equals方法的对称或传递性需求。

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