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add decorator pattern , jvm
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‎DesignPattern/src/decorator/Chocolate.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:26
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* @Function Description ：
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* 具体的 Decorator， 这里就是调味品
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*/
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public class Chocolate extends Decorator {
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public Chocolate(Drink obj) {
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super(obj);
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setDes(" 巧克力 ");
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setPrice(3.0f); // 调味品 的价格
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}
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}

‎DesignPattern/src/decorator/Coffee.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:27
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* @Function Description ：
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*/
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public class Coffee extends Drink {
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@Override
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public float cost() {
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// TODO Auto-generated method stub
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return super.getPrice();
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}
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}

‎DesignPattern/src/decorator/CoffeeBar.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:27
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* @Function Description ：
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*/
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public class CoffeeBar {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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// 装饰者模式下的订单：2 份巧克力+一份牛奶的 LongBlack
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// 1. 点一份 LongBlack
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Drink order = new LongBlack();
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System.out.println("费用 1=" + order.cost());
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System.out.println("描述=" + order.getDes());
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// 2. order 加入一份牛奶
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order = new Milk(order);
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System.out.println("order 加入一份牛奶 费用 =" + order.cost());
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System.out.println("order 加入一份牛奶 描述 = " + order.getDes());
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// 3. order 加入一份巧克力
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order = new Chocolate(order);
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System.out.println("order 加入一份牛奶 加入一份巧克力 费用 =" + order.cost());
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System.out.println("order 加入一份牛奶 加入一份巧克力 描述 = " + order.getDes());
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// 3. order 加入一份巧克力
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order = new Chocolate(order);
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System.out.println("order 加入一份牛奶 加入 2 份巧克力 费用 =" + order.cost());
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System.out.println("order 加入一份牛奶 加入 2 份巧克力 描述 = " + order.getDes());
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System.out.println("===========================");
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Drink order2 = new DeCaf();
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System.out.println("order2 无因咖啡 费用 =" + order2.cost());
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System.out.println("order2 无因咖啡 描述 = " + order2.getDes());
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order2 = new Milk(order2);
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System.out.println("order2 无因咖啡 加入一份牛奶 费用 =" + order2.cost());
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System.out.println("order2 无因咖啡 加入一份牛奶 描述 = " + order2.getDes());
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}
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}

‎DesignPattern/src/decorator/DeCaf.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:28
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* @Function Description ：
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*/
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public class DeCaf extends Coffee {
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public DeCaf() {
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setDes(" 无因咖啡 ");
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setPrice(1.0f);
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}
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}

‎DesignPattern/src/decorator/Decorator.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:28
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* @Function Description ：
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*/
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public class Decorator extends Drink {
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private Drink obj;
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public Decorator(Drink obj) { //组合
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// TODO Auto-generated constructor stub
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this.obj = obj;
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}
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@Override
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public float cost() {
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// TODO Auto-generated method stub
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// getPrice 自己价格
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return super.getPrice() + obj.cost();
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}
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@Override
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public String getDes() {
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// TODO Auto-generated method stub
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// obj.getDes() 输出被装饰者的信息 des父类的
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return des + " " + getPrice() + " && " + obj.getDes();
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}
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}

‎DesignPattern/src/decorator/Drink.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:29
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* @Function Description ：
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*/
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public abstract class Drink {
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public String des; // 描述
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private float price = 0.0f;
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public String getDes() {
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return des;
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}
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public void setDes(String des) {
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this.des = des;
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}
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public float getPrice() {
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return price;
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}
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public void setPrice(float price) {
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this.price = price;
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}
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//计算费用的抽象方法
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//子类来实现
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public abstract float cost();
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}

‎DesignPattern/src/decorator/Espresso.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:30
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* @Function Description ：
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*/
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public class Espresso extends Coffee {
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public Espresso() {
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setDes(" 意大利咖啡 ");
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setPrice(6.0f);
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}
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}

‎DesignPattern/src/decorator/LongBlack.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:31
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* @Function Description ：
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*/
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public class LongBlack extends Coffee {
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public LongBlack() {
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setDes(" longblack ");
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setPrice(5.0f);
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}
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}

‎DesignPattern/src/decorator/Milk.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:32
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* @Function Description ：
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*/
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public class Milk extends Decorator {
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public Milk(Drink obj) {
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super(obj);
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// TODO Auto-generated constructor stub
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setDes(" 牛奶 ");
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setPrice(2.0f);
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}
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}

‎DesignPattern/src/decorator/ShortBlack.java‎

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package decorator;
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/**
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* @author ： CodeWater
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* @create ：2022-05-13-15:33
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* @Function Description ：
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*/
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public class ShortBlack extends Coffee {
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public ShortBlack() {
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setDes(" shortblack ");
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setPrice(4.0f);
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}
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}

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