java设计模式--代理模式

//客户类
public class Customer {

    public String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

//出售商品的代理接口，这样就可以在所有实现这个接口的超市类中都可以使用外卖小哥类（Proxy代理）
public interface SaleGoods {
    void saleWater();
    void saleFood();
    void saleFruits();
}

//超市实现代理接口（定义外卖小哥所代表的真实的实体）
public class SuperMarket implements SaleGoods {

    Customer customer = null;

    public SuperMarket(Customer customer){
        this.customer = customer;
    }
    @Override
    public void saleWater() {
        System.out.println(customer.getName() +"购买的水");
    }

    @Override
    public void saleFood() {
        System.out.println(customer.getName() +"购买的食物");
    }

    @Override
    public void saleFruits() {
        System.out.println(customer.getName() +"购买的水果");
    }
}

//外卖小哥实现代理接口
public class TakeOutBrother implements SaleGoods {
    SuperMarket superMarket = null;

    public  TakeOutBrother(Customer customer){
　　　　//通过超市的引用调用超市的方法
        this.superMarket = new SuperMarket(customer);
    }
    @Override
    public void saleWater() {
　　　　　//调用超市的方法
        superMarket.saleWater();
    }

    @Override
    public void saleFood() {
        superMarket.saleFood();
    }

    @Override
    public void saleFruits() {
        superMarket.saleFruits();
    }
}

public class Test {
    public static void main(String[] args) {
        Customer customer = new Customer();
        customer.setName("zhangsan");
        TakeOutBrother takeOutBrother = new TakeOutBrother(customer);
        takeOutBrother.saleFood();
        takeOutBrother.saleFruits();
        takeOutBrother.saleWater();
    }
}