Java中的循环继承层次结构 [英] Cyclic inheritance hierarchy in Java

问题描述

我知道Java中不允许使用以下循环继承层次结构。编译器抛出错误，但我真正感兴趣的是知道编译失败的确切原因。

I know following cyclic inheritance hierarchy is not allowed in Java. Compiler throws an error, but what I'm really interested is knowing the exact reason for the compilation failure.

class A extends B{}
class B extends C{}
class C extends A{}  // this will give you compile time error.

编译器抛出错误的原因是什么，我编写代码的那一刻 C类扩展A {}

What is the thing due to which the compiler will throw an error, the moment I write the code class C extends A{}

推荐答案

这种关系根本不可能。它定义了一个无限递归类。为了定义 class C ，你需要 class A 来定义 class A 您需要 B类，并定义 B类您需要类C - 你回到了起点。这种情况无穷无尽，因此编译器无法做到这一点，也没有逻辑意义。

Such relation is simply not possible. It defines an infinite recursive class. In order to define class C, you need class A, to define class A you need class B, and to define class B you need class C - and you are back to the starting point. This goes on infinitely so compiler can't do this and it also has no logical meaning.

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