java 23 种设计模式 07装饰模式

一、什么是装饰模式
   装饰（ Decorator ）模式又叫做包装模式。通过一种对客户端透明的方式来扩展对象的功能，
是继承关系的一个替换方案。

二、装饰模式的结构


三、装饰模式的角色和职责

抽象组件角色： 一个抽象接口，是被装饰类和装饰类的父接口。具体组件角色：为抽象组件的实现。
抽象装饰角色：包含一个组件的引用，并定义了与抽象组件一致的接口。
具体装饰角色：为抽象装饰角色的实现类。负责具体的装饰。

代码下载：链接：百度云密码：puht

代码：

包1：

public interface Car {public void show();public void run();}public class FlyCar implements Car {public void show() {this.run();this.fly();}public void run() {System.out.println("可以跑");}public void fly() {System.out.println("可以飞");}}public class RunCar implements Car {public void run() {System.out.println("可以跑");}public void show() {this.run();}}public class SwimCar implements Car{public void run() {System.out.println("可以跑");}public void Swim() {System.out.println("可以游");}public void show() {this.run();this.Swim();}}public class MainClass {public static void main(String[] args) {Car flycar = new SwimCar();flycar.show();}}

包2：升级

package com.ibeifeng.news;public interface Car {public void show();public void run();}package com.ibeifeng.news;public class FlyCarDecorator extends CarDecorator{public FlyCarDecorator(Car car) {super(car);}public void show() {this.getCar().show();this.fly();}public void fly() {System.out.println("可以飞");}public void run() {}}package com.ibeifeng.news;public class RunCar implements Car {public void run() {System.out.println("可以跑");}public void show() {this.run();}}package com.ibeifeng.news;public class SwimCarDecorator extends CarDecorator {public SwimCarDecorator(Car car) {super(car);}public void show() {this.getCar().show();this.swim();}public void swim() {System.out.println("可以游");}public void run() {}}package com.ibeifeng.news;public class MainClass {public static void main(String[] args) {Car car = new RunCar();car.show();System.out.println("---------");Car swimcar = new SwimCarDecorator(car);swimcar.show();System.out.println("---------");Car flySwimCar = new FlyCarDecorator(swimcar);flySwimCar.show();}}package com.ibeifeng.news;public abstract class CarDecorator implements Car{private Car car;public Car getCar() {return car;}public void setCar(Car car) {this.car = car;}public CarDecorator(Car car) {this.car = car;}public abstract void show();}

更新中。。。。