1.柜台商品管理系统

实体类：Goods
	属性
		id 商品编号
		goodsName 商品名称
		price 商品价格
		desc 商品描述

	封装..提供get和set
	
	无参构造器和有参构造器
		有参构造器初始化初始化商品对象
		
	重写toString()方法
		可以直接显示数据

package cn.hp;

/**
 * id 商品编号
 * goodsName 商品名称
 * price 商品价格
 * desc 商品描述
 */
public class Goods {
    private Integer id;
    private String goodsName;
    private Integer price;
    private String desc;

    public Integer getId() {
        return id;
    }

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

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    public Integer getPrice() {
        return price;
    }

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

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public Goods(Integer id, String goodsName, Integer price, String desc) {
        this.id = id;
        this.goodsName = goodsName;
        this.price = price;
        this.desc = desc;
    }

    public Goods() {
    }

    @Override
    public String toString() {
        return "Goods{" +
                "id=" + id +
                ", goodsName='" + goodsName + '\'' +
                ", price=" + price +
                ", desc='" + desc + '\'' +
                '}';
    }
}

#2.柜台类：Counter

	属性：
		柜台商品列表，固定10个商品位置
		Goods[]goodses = new Goods[10]; 
		num 柜台商品数量


	构造器：
		无参构造器初始化2个商品
		public Counter(){
			this.goodses[0]=new Goods(1001,"巧克力",25,"美味可口，恋爱必备！");
			this.goodses[1]=new Goods(1002,"卫龙辣条",1,"隔壁小孩馋哭了！");
			num=2;//相当于两个商品
		}


	业务方法：
		展示柜台所有的商品(不能输出null)
		public void show(){

		}

package cn.hp;

/**
 * 柜台商品列表，固定10个商品位置
 * Goods[]goodses = new Goods[10];
 * num 柜台商品数量
 */
public class Counter {
    Goods[] goodses = new Goods[10];
    int nums;
    public Counter(){
        this.goodses[0] = new Goods(1001,"巧克力",25,"美味可口，恋爱必备！");
        this.goodses[1]=new Goods(1002,"卫龙辣条",1,"隔壁小孩馋哭了！");
        nums = 2;
    }
    public void show(){
        for (int i = 0; i < goodses.length; i++) {
            if (goodses[i]!=null){
                System.out.println(goodses[i]);
            }
        }
    }
}

#3.测试类：CounterTest

	程序入口main方法中，创建柜台对象，调用show()方法展示柜台商品

package cn.hp;

public class CounterTest {
    public static void main(String[] args) {
        Counter cou = new Counter();
        cou.show();
    }
}