装饰者模式
作者:互联网
一、文件目录
二、继承关系图
三、代码
Beverage.jva
package decoratormode.interfa;
public abstract class Beverage {
protected String description = "Unknown Beverage";
public abstract double cost();
public String getDescription(){
return description;
} //这里的描述不是抽象的,正是因为它本身实现了
}
CondimentDecorator.java
package decoratormode.interfa;
public abstract class CondimentDecorator extends Beverage{
public abstract String getDescription();//所有的调料装饰者都必须重新实现
}
Espresso.java
package decoratormode.impl;
import decoratormode.interfa.Beverage;
public class Espresso extends Beverage {
public Espresso(){
description = "Espresso";
}
@Override
public double cost() {
return 1.99;
}
}
HouseBlend.java
package decoratormode.impl;
import decoratormode.interfa.Beverage;
public class HouseBlend extends Beverage {
public HouseBlend(){
description = "House Blend Coffee";
}
@Override
public double cost() {
return .89;
}
}
Mocha.java
package decoratormode.impl;
import decoratormode.interfa.Beverage;
import decoratormode.interfa.CondimentDecorator;
public class Mocha extends CondimentDecorator {
Beverage beverage;
public Mocha(Beverage beverage){
this.beverage = beverage;
}
@Override
public double cost() {
return .20 + beverage.cost();
}
@Override
public String getDescription() {
return beverage.getDescription() + ", Mocha";
}
}
Mai.java
package decoratormode;
import decoratormode.impl.Espresso;
import decoratormode.impl.HouseBlend;
import decoratormode.impl.Mocha;
import decoratormode.interfa.Beverage;
public class Mai {
public static void main(String[] args) {
Beverage beverage = new Espresso();
System.out.println(beverage.getDescription() + " $" +beverage.cost());
Beverage beverage2 = new HouseBlend();
beverage2 = new Mocha(beverage2);
beverage2 = new Mocha(beverage2);
System.out.println(beverage2.getDescription() + "$ " + beverage2.cost());
}
}
四、输出
Espresso $1.99
House Blend Coffee, Mocha, Mocha$ 1.29
Process finished with exit code 0
标签:Beverage,decoratormode,模式,public,beverage,import,Mocha,装饰 来源: https://blog.csdn.net/jiuweideqixu/article/details/114543680