多线程-银行分批存款

package test;

/**
 * author：songyan
 * date: 2019/11/10
 **/
public class demo2 {
    public static void main(String[] args) {
        SaveWindow save = new SaveWindow();
        Thread user1 = new Thread(save);
        Thread user2 = new Thread(save);
        user1.start();
        user2.start();
    }
}

/**
 * 银行类
 */
class Bank{
    int money = 0;
    Object obj = new Object();
    public void saveMoney(int addMoney){
        synchronized (obj){
            money = money + addMoney;
            System.out.println("money  "+money);
        }

    }
}

/**
 * 银行的存钱窗口
 */
class SaveWindow implements Runnable{
    Bank bank = new Bank();
    @Override
    public void run() {
        for (int i=0;i<3;i++){
            bank.saveMoney(100);
        }
    }
}

通过同步代码块解决安全问题