[JAVA] Abstract classes and interfaces

Abstract class:

With abstract modification, there must be an abstraction (or a non-abstract method) that inherits extends

Inheriting the subclass of an abstract class, you must implement all abstract methods of the abstract class, otherwise, subclasses are abstract classes

Interface

With interface modification, variables are constant (with public static final modification, can be omitted), all methods are abstract methods (public abstract method and can only be public abstract method, can be omitted), Inheritance with implements

A class implements multiple interfaces to compensate for the disadvantage that Java cannot achieve multiple inheritance

The essential difference between abstract classes and methods

Abstract classes are abstractions of a class of things, and interfaces are abstractions of behavior.

Abstract classes and interfaces are briefly described in this article, the following two references are detailed for your reference

Reference:

Http://www.importnew.com/18780.html

http://blog.csdn.net/chenssy/article/details/12858267

[JAVA] Abstract classes and interfaces