线程可见性

可以看到程序变量running没volatile是死循环

加了volatile成功输出

 

public class VolitaleTest {private static volatile boolean running = true;public static void main(String[] args) {Thread thread = new Thread(() ->{long i =0L;while (running){i++;}System.out.println("end and i = " + i);});thread.start();try {//暂停1秒Thread.sleep(1000);running = false;} catch (InterruptedException e) {e.printStackTrace();}}
}