java.lang.Comparable和equals [英] java.lang.Comparable and equals

问题描述

如果我为一个类实现 java.lang.Comparable ，我还是要覆盖 equals（）方法？或者可比较是否也适用于等于？

If I implement java.lang.Comparable for a class, do I still have to override the equals() method? Or will the Comparable work for equals as well?

如果答案是否，那么如果出现一些差异怎么办？假设我在 equals（）方法中将两个对象称为相等的方式不同于我在<$ c $中将同一类的两个对象称为相等的方式c> compareTo（） 可比较。

If the answer is no, then what if some discrepancy arises? Let's say the way I term two objects as equal within the equals() method is different from the way I term two objects of the same class as equal within the compareTo() of the Comparable.

此外，如果我实施可比较，我是否还必须覆盖 equals（）？

Moreover, if I implement Comparable, do I also have to override equals()?

推荐答案

虽然建议（并且非常明智）有 a.compareTo（b）== 0 暗示 a.equals（b）（反之亦然），不是必需的。 可比较用于对一系列对象执行排序时使用，而等于（）只测试直接平等。

While it is recommended (and pretty sensible) that having a.compareTo(b) == 0 imply that a.equals(b) (and visa versa), it is not required. Comparable is intended to be used when performing an ordering on a series of objects, whereas equals() just tests for straight equality.

此链接有一些关于正确实施 compareTo 的信息。

This link has some good information on implementing compareTo properly.

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