【设计模式】策略模式设计-电影票打折功能

拾贰_C2023-12-06 3:00

任务二：使用策略模式设计电影票打折功能

某电影院售标系统为不同类型的用户提供了不同的打折方式（Discount） ，学生凭学生证可享受8折优惠**（StudentDiscount），儿童可享受减免10元的优惠 （ChildrenDiscount），VIP用户除享受半价优惠外还可以进行积分（VIPDiscount）**。使用策略模式设计该系统。

UML-class

i

1

java 复制代码

* @ClassName: Ticket  * @Description: TODO  * @Author ZSC  * @Date 2023/12/4 11:32  * @Version 1.0 public class Ticket {

    private double price;
    private Discount discount;

    public double getPrice() {
        return discount.calculate(this.price);
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public void setDiscount(Discount discount) {
        this.discount = discount;
    } }

2

java 复制代码

public interface Discount {
    public double calculate(double price);
}

3

java 复制代码

    @Override
    public double calculate(double price) {
        return price-10;
    } }

public class StuDiscount implements Discount{
    @Override
    public double calculate(double price) {
        return price*0.8;
    } }


public class VIPDiscount implements Discount{
    @Override
    public double calculate(double price) {
        System.out.println("提示：增加积分！");
        return price*0.5;
    } }

4

java 复制代码

public class TicketMain {
    public static void main(String[] args) {
        // discout
        double disPrice;
        Ticket ticket = new Ticket();
        // set price
        ticket.setPrice(66.66);


        // stu
        Discount stuDiscount = new StuDiscount();
        ticket.setDiscount(stuDiscount);
        disPrice = ticket.getPrice();
        System.out.println("stu--折后价格为："+disPrice);

        // chil
        Discount chilDiscount = new ChilDiscount();
        ticket.setDiscount(chilDiscount);
        disPrice = ticket.getPrice();
        System.out.println("childen--折后票价为："+disPrice);
        System.out.println("==========================");
        // VIP
        Discount vipDiscount = new VIPDiscount();
        ticket.setDiscount(vipDiscount);
        disPrice = ticket.getPrice();
        System.out.println("VIP会员---折后票价为："+disPrice);
    }
}

reference

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