package lianxi1;class User implements Runnable{    static Account account = new Account();    @Override    public void run() {        for(int i=0;i<3;i++){            account.deposit(1000.00);        }            }    }class Account{    private double balance;    public Account(){            }    public Account(double balance) {        super();        this.balance = balance;    }    public synchronized void deposit(double num){        try {            Thread.currentThread().sleep(10);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        balance = balance + num; //两个线程先后唤醒，第一个线程加1000，没打印，第二个线程又加1000，                                 //开始打印第一个线程和第二个，所以线程1和2的余额相同        System.out.println(Thread.currentThread().getName()+"存款，账户余额："+balance);    }}public class TestThreadAccount {    public static void main(String[] args) {          User au = new User();          Thread t1 = new Thread(au);          Thread t2 = new Thread(au);          t1.setName("顾客1");          t2.setName("顾客2");          t1.start();          t2.start();    }}