1 import java.util.concurrent.TimeUnit;
2
3 /**
4 * 对写业务加锁
5 * 对读业务不加锁
6 * 脏读
7 */
8 public class Account {
9
10 String name;
11 double balance;
12
13 public synchronized void set(String name, double balance) {
14 this.name = name;
15 try {
16 Thread.sleep(2000); //写线程休眠两秒
17 } catch (InterruptedException e) {
18 e.printStackTrace();
19 }
20 this.balance = balance;
21 }
22
23 /**
24 * 解决脏读在方法上加synchronized
25 * @param name
26 * @return
27 */
28 public /*synchronized*/ double getBalance(String name) {
29 return this.balance;
30 }
31
32 public static void main(String[] args) {
33
34 Account account = new Account();
35 new Thread(() -> account.set("张三", 100.0)).start();
36
37 try {
38 TimeUnit.SECONDS.sleep(1); //读线程休眠一秒
39 } catch (InterruptedException e) {
40 e.printStackTrace();
41 }
42
43 System.out.println(account.getBalance("张三"));
44
45 try {
46 TimeUnit.SECONDS.sleep(2); //读线程休眠两秒
47 } catch (InterruptedException e) {
48 e.printStackTrace();
49 }
50
51 System.out.println(account.getBalance("张三"));
52
53 }
54
55 }
