using System.Collections;

namespace Lesson1_ArrayList练习题
{
    class Backpack
    {
        ArrayList stuff;
        int money;
        public Backpack() 
        {
            money = 0;
            stuff = new ArrayList();
        }
        public Backpack(int money)
        {
            stuff = new ArrayList();
            this.money = money;
        }
        public void ShowBackPack()
        {
            Console.WriteLine("背包物品有：");
            for (int i = 0; i < stuff.Count; i++)
            {
                if (i + 1 != stuff.Count)
                {
                    Console.Write(stuff[i] + "、");
                }
                else
                {
                    Console.WriteLine(stuff[i]);
                }
            }
        }
        public void BuyStuff(Object obj,int cost) 
        {
            if(cost > money)
            {
                Console.WriteLine("余额不足");
            }
            else
            {
                stuff.Add(obj);
                money -= cost;
                Console.WriteLine("成功购买物品：" + obj);
            }
        }
        public void SoldStuff(object obj,int earned)
        {
            if (stuff.Contains(obj))
            {
                stuff.Remove(obj);
                money += earned;
                Console.WriteLine("成功出售物品：" + obj);
            }
            else
            {
                Console.WriteLine("没有该物品，无法出售：" + obj);
            }
        }
        public void ShowMoney()
        {
            Console.WriteLine("当前余额：" + money);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Backpack b1= new Backpack();
            Backpack b2 = new Backpack(100);
            b1.ShowBackPack();
            b2.ShowBackPack();
            b1.BuyStuff("sth1", 50);
            b2.BuyStuff("sth2", 50);
            b1.ShowBackPack();
            b2.ShowBackPack();
            b1.SoldStuff("sth1", 25);
            b2.SoldStuff("sth2", 25);
            b1.ShowBackPack();
            b2.ShowBackPack();
            b1.ShowMoney();
            b2.ShowMoney();
        }
    }
}