大话设计模式-原型模式的实践-限制订单最大数量

版权声明：Leo.All Rights Reserved. https://blog.csdn.net/qq_41113081/article/details/89034976

/*
* 订单处理系统 原型模式实现
现在有一个订单处理系统，里面有一个保存订单的业务功能，需求：
1.每当订单的预定产品数量超过1000的时候，就需要把订单拆成两份订单来保存。
2.如果拆成两份后还是超过1000，则继续拆分，直到每份产品预订数量不超过1000.
根据业务，目前的订单系统分成两种，一种是个人订单、一种是公司订单。
客户名称、产品对象（ID，Name），订购产品数量。
公司名称、产品对象（ID，Name），订购产品数量。
*/

 产品类：

/**
 * @ClassName: Product
 * @Author: Leo
 * @Description:
 * @Date: 2019/4/4 19:14
 */
public class Product implements Cloneable {
    private int id;
    private String name;

    public Product() {
    }

    public Product(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    @Override
    public String toString() {
        return "ID: " + id + "  Name: " + name;
    }
}

订单类（包含产品对象）： 

/**
 * 订单
 */
public class Order implements Cloneable {
    private String name;
    private Product product;
    private int num;

    public Order() {
    }

    public Order(String name, Product product, int num) {
        this.name = name;
        this.product = product;
        this.num = num;
    }

    public String getName() {
        return name;
    }

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

    public Product getProduct() {
        return product;
    }

    public void setProduct(Product product) {
        this.product = product;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    @Override
    public String toString() {
        return "Name: " + name + " {" + product.toString() + "} Num: " + num;
    }
}

Main： 

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static final int MAX_NUM = 10;

    public static void main(String[] args) throws CloneNotSupportedException {
        List list = new ArrayList<Order>();
        Product product = new Product(1, "iPhone");
        Order order = new Order("BaiDu", product, 100);
        //list.add(order);
        while (order.getNum() > MAX_NUM) {
            Order temp = (Order) order.clone();
            temp.setNum(MAX_NUM);
            list.add(temp);
            order.setNum(order.getNum() - MAX_NUM);
        }
        list.add(order);
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).toString());
        }
        System.out.println(list.size());
    }
}