内存模型8大原子操作---非volatile

flag = true

主内存

2.load

flag = false

CPU

main线程

5.load

6.use

9.write

3.use

4.read

1.read

public class Test {    public static boolean flag = false;    public static void main(String[] args) throws Exception {        Thread t1 = new Thread(new Runnable() {            @Override            public void run() {                //子线程休眠1s，让主线程启动后再去修改flag                try {                    TimeUnit.SECONDS.sleep(1);                } catch (InterruptedException e) {                    e.printStackTrace();                }                //TODO: 修改成员变量                flag = true;                System.out.println(\"子线程修改了flag = \" + flag);            }        });        t1.start();        while (true) {            if (flag) {                System.out.println(\"主线程退出\");                break;            }        }    }}

                                                                工作内存                  

总线

                 变量副本

8.store

t1 线程

           变量副本

                                                         工作内存

7. assign