Java - 你能把一个对象转换成一个不扩展的类吗？ [英] Java - Can you cast an object into a class it doesn't extend?

问题描述

另一种提出同样问题的方法是，给定2类A和B，它是同义词：对象A可以转换成B，对象A是B的后代？

Another way to ask the same question is, given 2 classes A and B, is it synonymous to say: "Object A can be cast into B" and "Object A is a descendant of B"?

感谢，

JDelage

strong>澄清这个问题，使A和B都更清楚。

Clarified the question to make it clearer that both A and B are classes.

推荐答案

将对象转换为不扩展的类。 - 不，你不能。

"Java - Can you cast an object into a class it doesn't extend?" - No, you can't.

基本上，说：对象A可以转换成B，对象A是B的直接后代？ - 是的。在A是实现接口B的类的情况下。

"Basically, is it synonymous to say: "Object A can be cast into B" and "Object A is a direct descendant of B"?" - Yes. Plus in the case when A is of a class implementing interface B.

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