An overriding method can also return a subtype of the type returned by the overridden method.

最重要的方法也将被重写的方法返回类型的子类型。

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When you finally realize that a method has a parameter wrong, and in fact isn't overriding a method from a superclass, much bitterness can result.

当最后认识到方法的参数有错，且该方法实际上没有覆盖超类中的方法时，您可能更感到难受。

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You were able to change the intent of the disk_space method completely by overriding the method in the MyDiskMonitor class.

通过重写My diskmonitor类中的方法，您能够完全改变disk_space方法的意图。

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