线程状态

• sleep,yield 不释放锁

  private synchronized void sleeping() {
        System.out.println(Thread.currentThread() + "获取到了锁");
        try {
            Thread.sleep(2000);
            System.out.println("休眠结束");
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            System.out.println(Thread.currentThread() + "释放锁");
        }
    }

    
    private static void testSleeping() {
        ThreadStatusDemo demo = new ThreadStatusDemo();
        for (int i = 0; i < 5; i++) {
            new Thread(demo::sleeping).start();
        }
    }

    public static void main(String[] args) {
        testSleeping();
    }

运行结果:

image.png

• wait释放锁

 private synchronized void wait0() {
        System.out.println(Thread.currentThread() + "成功获得锁,说明前一个线程已经释放了锁");
        try {
            wait(2000);
            System.out.println(Thread.currentThread() + "休眠结束");
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            System.out.println(Thread.currentThread() + "运行结束");
        }
    }
    
    private static void testWait() {
        ThreadStatusDemo demo = new ThreadStatusDemo();
        for (int i = 0; i < 5; i++) {
            new Thread(demo::wait0).start();
        }
    }

    public static void main(String[] args) {
        testWait();
    }

运行结果:

image.png