设计模式（二）之装饰器模式

来源：互联网发布：马龙知乎编辑：程序博客网时间：2024/05/21 03:28

定义一个代表被装饰事物的接口：

public interface Coffee {    public String getCoffer();    public double getPrice();}

最初的具体事物：

public class Starbucks implements Coffee {    @Override    public String getCoffer() {        return "星巴克";    }    @Override    public double getPrice() {        return 10D;    }}

被装饰后的具体事物：

public class Seasoning implements Coffee {    private Coffee coffee;    public Seasoning(Coffee coffee) {        this.coffee = coffee;    }    @Override    public String getCoffer() {        return coffee.getCoffer();    }    @Override    public double getPrice() {        return coffee.getPrice();    }}

一号装饰器：

public class SeasoningOne extends Seasoning implements Coffee {    public SeasoningOne(Coffee coffee) {        super(coffee);    }    @Override    public String getCoffer() {        return super.getCoffer() + " 糖";    }    @Override    public double getPrice() {        return super.getPrice() + 1.0D;    }}

二号装饰器：

public class SeasoningTwo extends Seasoning implements Coffee {    public SeasoningTwo(Coffee coffee) {        super(coffee);    }    @Override    public String getCoffer() {        return super.getCoffer() + " 牛奶";    }    @Override    public double getPrice() {        return super.getPrice() + 5.0D;    }}

三号装饰器：

public class SeasoningThree extends Seasoning implements Coffee {    public SeasoningThree(Coffee coffee) {        super(coffee);    }    @Override    public String getCoffer() {        return super.getCoffer() + " 摩卡";    }    @Override    public double getPrice() {        return super.getPrice() + 3.0D;    }}

使用者：

public class Consumer {    public static void main(String[] args) {        Coffee coffee = new SeasoningOne(new Seasoning(new Starbucks()));        System.out.println(coffee.getCoffer() + ":" + coffee.getPrice());        coffee = new SeasoningTwo(new SeasoningOne(new Seasoning(                new Starbucks())));        System.out.println(coffee.getCoffer() + ":" + coffee.getPrice());        coffee = new SeasoningThree(new SeasoningTwo(new SeasoningOne(                new Seasoning(new Starbucks()))));        System.out.println(coffee.getCoffer() + ":" + coffee.getPrice());    }}

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