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This article mainly introduces the Java abstract classes and interfaces how to distinguish the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe you will gain after reading this Java abstract classes and interfaces how to distinguish the article, let's take a look.

What are abstract classes and interfaces? What's the difference?

There may be some differences in the way interfaces and abstract classes are defined by different programming languages, but not much. This article uses the Java language.

Abstract class

Let's look at a typical usage scenario of an abstract class through an example.

Logger is an abstract class for logging. FileLogger and MessageQueueLogger inherit Logger and implement two different logging methods:

Log to a file

Log to message queue

The FileLogger and MessageQueuLogger subclasses reuse the name, enabled, minPermittedLevel properties and log methods in the parent class Logger, but because the two subclasses write logs in different ways, they each override the doLog method in the parent class.

Parent class

Import java.util.logging.Level;/** * Abstract parent Class * @ author yanliang * @ date 9 Universe 27 Universe 27 5:59 PM * / public abstract class Logger {private String name; private boolean enabled; private Level minPermittedLevel; public Logger (String name, boolean enabled, Level minPermittedLevel) {this.name = name; this.enabled = enabled; this.minPermittedLevel = minPermittedLevel } public void log (Level level, String message) {boolean loggable = enabled & & (minPermittedLevel.intValue ()

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