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package com.basic;

import java.util.concurrent.TimeUnit;

/**

* @program JavaBooks

* @description: 对业务写方法加锁，对业务读方法不加锁，容易产生脏读问题

* @author: mf

* @create: 2019/12/26 21:41

*/

public class Account {

String name;

double balance;

public synchronized void set(String name, double balance) {

this.name = name;

/**

* 故意设置2秒，让name和balance之间，受到其他事务的影响，产生脏读

*/

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

this.balance = balance;

}

public /*synchronized*/ double getBalance(String name) {

return this.balance;

}

public static void main(String[] args) {

Account a = new Account();

new Thread(() -> a.set("zhangsan", 100.0)).start();

try {

TimeUnit.SECONDS.sleep(1);

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(a.getBalance("zhangsan"));

try {

TimeUnit.SECONDS.sleep(2);

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(a.getBalance("shangsan"));

}

}