多重继承和类对象 [英] Multiple Inheritance and class Object

问题描述

我对OOP很新。我们都知道Java不支持多继承;但是，所有Java类都继承自 Object ，并且还可以从另一个类继承。我们可以认为这是多重继承吗？ Java如何处理这样的事情？

I am pretty new to OOP. We all know that Java does not support multiple inheritance; however, all Java classes inherit from Object and can also inherit from another class. Can we consider this as multiple inheritance? How does Java handle such a thing?

推荐答案

这不是多继承，它是多级继承。类可以扩展另一个类，它可以扩展另一个类，...，最终扩展对象：

It's not multiple inheritance it's multi level inheritance. Classes can extend one other class, which can extend one other class, ..., which ultimately extends Object:

A --> B --> C --> Object

多重继承将

A ----> B 
  \
   \--> C

这意味着当在A中使用方法或字段时，然后在B中，然后在C中，然后在Object中。

This means that when a method or a field is used inside A, it's looked up in A, then in B, then in C, then in Object.

使用多重继承，它必须在A中查找，然后在B和C中查找，并且可能存在冲突，因为相同的方法或字段可能存在于两个超类。

With multiple inheritance, it would have to be looked up in A, then in B and C, and there could be a conflict because the same method or field could exist in both superclasses.

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