线程可见性和关键字volatile

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();
        }
    }
}