java多线程 银行取款

package net.okren.java;

import java.io.*;

//账户
class Account{
    private float balance = 1000;
    public float getBalance(){
        return balance;
    }

    public void setBalance(float balance){
        this.balance = balance;
    }

    public synchronized void withDraw(float money){
        if(balance >= money){
            System.out.println("取走 "+ money +"钱");
            try{
                Thread.sleep(1000);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
            balance -= money;
        }else{
            System.out.println("余额不足 ");
        }
    }
}

class TestAccount1 extends Thread{
    private Account account;
    public TestAccount1(Account account){
        this.account = account;
    }

    public void run(){
        account.withDraw(800);
        System.out.println("余额为"+ account.getBalance());
    }
}

class TestAccount2 extends Thread{
    private Account account;
    public TestAccount2(Account account){
        this.account = account;
    }

    public void run(){
        account.withDraw(700);
        System.out.println("余额为 " + account.getBalance());
    }
}
public class JavaTest {

    public static void main(String[] args){

        Account account = new Account();
        TestAccount1 t1 = new TestAccount1(account);
        TestAccount2 t2 = new TestAccount2(account);
        t1.start();
        t2.start();


    }
}