多线程编程

public class Main
{
public static void main(String[] args)
{
Bank bank=new Bank();
ThreadDemo p1=new ThreadDemo(bank);
p1.start();//柜台取钱
ThreadDemo p2=new ThreadDemo(bank);
p2.start();//ATM上取钱
}

}
class Bank
{
public int money=500;
public int getMoney(int number)
{
if(number<0)
{
return -1;
}
else if(money<0)
{
return -2;
}
else if(number-money>0)
{
return -3;
}
else
{

try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
money-=number;
System.out.println("账户的余额为："+number);

}
return number;
}

}
class ThreadDemo extends Thread
{
private Bank bank=null;

public ThreadDemo(Bank bank)
{
this.bank=bank;
}
public void run()
{
System.out.println("取钱："+bank.getMoney(400));
}

}