为什么我下面的程序，既没有报错但是没有输出啊？

Question

class Account2
{
private String accountNo;
private double balance;
private boolean flag=false;
public Account2() {}
public Account2(String accountNo,double balance)
{
this.accountNo=accountNo;
this.balance=balance;
}
public void setAccountNo(String n)
{
accountNo=n;
}
public String getAccountNo()
{
return accountNo;
}
public double getBalance()
{
return this.balance;
}
public synchronized void draw(double drawAmount)
{
try
{
if(!flag)
{
wait();
}
else
{
System.out.println(Thread.currentThread().getName()+"取钱："+drawAmount);
balance-=drawAmount;
System.out.println("账户余额为："+balance);
flag=false;
notifyAll();
}
}
catch(InterruptedException ex)
{
ex.printStackTrace();
}
}
public synchronized void depoist(double depoistAmount)
{
try
{
if(flag)
{
wait();
}
else
{
System.out.println(Thread.currentThread().getName()+"存钱："+depoistAmount);
balance+=depoistAmount;
System.out.println("账户余额为："+balance);
flag=true;
notifyAll();
}
}
catch(InterruptedException ex)
{
ex.printStackTrace();
}
}
public int hashCode()
{
return accountNo.hashCode();
}
public boolean equals(Object obj)
{
if(this==obj)
return true;
if(obj!=null&& obj.getClass()==Account1.class)
{
Account1 target=(Account1)obj;
return target.getAccountNo().equals(accountNo);
}
return false;
}
}
class DrawThread1 extends Thread
{
private Account2 account;
private double drawAmount;
public DrawThread1(String name,Account2 account,double drawAmount)
{
super(name);
this.account=account;
this.drawAmount=drawAmount;
}
public void run()
{
for(int i=0;i<100;i++)
{
account.draw(drawAmount);
}
}
}
class DepoistThread extends Thread
{
private Account2 account;
private double depoistAmount;
public DepoistThread(String name,Account2 account,double depoistAmount)
{
super(name);
this.account=account;
this.depoistAmount=depoistAmount;
}
public void run()
{
for(int i=0;i<100;i++)
{
account.draw(depoistAmount);
}
}
}
public class DrawSaveDemo {

public static void main(String[] args) {
    Account2 acct=new Account2("1234567",0);
    new DrawThread1("取钱者",acct,800).start();
    new DepoistThread("存款者甲",acct,800).start();
    new DepoistThread("存款者乙",acct,800).start();
    new DepoistThread("存款者丙",acct,800).start();
}

}

Answer 1

你的DepoistThread 是从DrawThread 复制的吧，里面应该调用的是account.depoist(depoistAmount)方法，你现在代码都是调用draw，所以就一直等待了。
PS：以后再提问的话，代码就用代码格式写出来，否则的话大部分人不会回答你这样很难看懂的代码的问题的。