using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Threading;

namespace TestLock

{

    class Program

    {

        static void Main(string[] args)

        {

           Test1();

        }

        public static void Test1()

        {

              Thread[] threads = new Thread[]; //开启10个线程

              Animal a = new Animal();

            for (int i = ; i < ; i++)

            {

                Thread t = new Thread(a.Add1); //10 个线程同时执行方法 Add1

                threads[i] = t;

            }

            for (int i = ; i < ; i++)

            {

                threads[i].Start(); //启动线程

            }

            Console.ReadLine();

        }

    }

    public class Animal

    {

        int balance = ;

        private  object obj = new object();

        public  void Add1()

        {

            for (int i = ; i < ; i++) //每个线程执行1000次Withdraw1方法

            {

                Withdraw1(new Random().Next(, ));

            }

        }

        public void Withdraw1(int a)

        {

            if (balance < )

            { throw new Exception("为负了"); } //不加锁,就会抛出该异常,加锁后不会抛出

            //lock (obj)

            //{

            if (balance >= a)

            {

                Console.WriteLine("before"+balance);

                Console.WriteLine("减去"+a);

                balance = balance - a; //多线程情况下,此处balance 会被其他线程修改,造成负值

                Console.WriteLine("剩余" + balance);

            }

         //}

        }

    }

}