You can never cast objects of sibling classes (sharing the same parent), even with an explicit cast.

你永远不可能转化具有同一个超类的类的对象，即使是刻意转化。

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Eclipse writes the superclass automagically with its new methods and alters the sibling classes to use the new superclass.

Eclipse将使用其新方法自动编写超类，然后更改兄弟类，使之使用新的超类。

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