Lesson: Interfaces and Inheritance课程：接口和继承

Interfaces接口

You saw an example of implementing an interface in the previous lesson.您在上一课中看到了实现接口的示例。You can read more about interfaces here您可以在此处阅读有关接口的更多信息—what they are for, why you might want to write one, and how to write one.它们是用来做什么的，为什么你可能想写一个，以及如何写一个。

Inheritance继承

This section describes the way in which you can derive one class from another.本节介绍从一个类派生另一个类的方法。That is, how a subclass can inherit fields and methods from a superclass.也就是说，子类如何从超类继承字段和方法。You will learn that all classes are derived from the Object class, and how to modify the methods that a subclass inherits from superclasses.您将了解所有类都是从Object类派生的，以及如何修改子类从超类继承的方法。This section also covers interface-like abstract classes.本节还介绍了抽象类等接口。