Introduction to the differences between Java abstract classes and interfaces

• Java

The difference between abstract classes and interfaces

abstract class

A class containing abstract methods is an abstract class. The declared statement: abstract class must be public protected

Interface

For behavior abstraction, declaration statement: interface abstract method modifier: public abstract member variable modifier: public static final

Grammatical level

Design level

Abstract class is the abstraction of things and classes; An interface is an abstraction of behavior and describes a behavior specification

Abstract class is an abstract description of the whole class, including attributes and behaviors; Interfaces can only abstract the behavior of classes

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