线程同步练习

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();
    }

}