Object类允许Java中的多重继承？ [英] Multiple Inheritance in Java allowed with Object class?

问题描述

在Java中，他们说不支持多重继承。事实上，Java中的每个类都扩展了Object类。所以，如果我写：

In Java, they say that Multiple Inheritance is not supported. Also its a fact, that each class in Java extends class Object. So if I write :

public class ThreadInstance extends Thread {
}

这是如何编译的？这里的ThreadInstance实际上是在扩展Thread和Object。这不是多重继承。

How does this compile? ThreadInstance here is actually extending Thread as well as Object. Isn't it multiple Inheritance here.

推荐答案

通过多重继承，你应该理解同时继承多个类，例如：无法创建

By multiple inheritance you should understand inheriting multiple classes at the same time, e.g. it's impossible to create a

public class ThreadInstance extends Thread, Object {
}

因为类层次结构如下所示：

because class hierarchy would look like this:

ThreadInstance
^            ^
Thread       Object

当你定义 ThreadInstance 就像你一样， ThreadInstance 也继承了 Object ，但是它第一个继承线程。

When you define your ThreadInstance like you did, the ThreadInstance inherits Object too, but it first inherits thread.

ThreadInstance
      ^
    Thread
      ^
    Object

那里没有多重继承。

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