测试线程sleep不让出锁

一直听说线程sleep不让出锁，现做个实验，代码如下
先写一个类，方法上都同步。

package test.thread.impl;

public class ThreadSleep {

    public synchronized void method1() throws InterruptedException {
        System.out.println("this is method1");
        Thread.sleep(2000);
    }

    public synchronized void method2() throws InterruptedException {
        System.out.println("this is method2");
        Thread.sleep(3000);
    }

}

再写两个测试的方法。
package test.thread.impl;

public class ThreadSleepTask1 implements Runnable {

    public ThreadSleepTask1(ThreadSleep threadSleep) {
        this.threadSleep = threadSleep;
    }

    private ThreadSleep threadSleep;

    @Override
    public void run() {
        System.out.println("this is ThreadSleepTask1 invoke threadSleep method1");
        try {
            threadSleep.method1();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package test.thread.impl;

public class ThreadSleepTask2 implements Runnable {

    public ThreadSleepTask2(ThreadSleep threadSleep) {
        this.threadSleep = threadSleep;
    }

    private ThreadSleep threadSleep;

    @Override
    public void run() {
        System.out.println("this is ThreadSleepTask2 invoke threadSleep method2");
        try {
            threadSleep.method2();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

再写一个测试类
package test.thread.impl;

public class ThreadSleepLock {
    public static void main(String[] args) throws InterruptedException {
        long beginTime = System.currentTimeMillis();
        ThreadSleep threadSleep = new ThreadSleep();
        ThreadSleepTask1 threadSleepTask1 = new ThreadSleepTask1(threadSleep);
        ThreadSleepTask2 threadSleepTask2 = new ThreadSleepTask2(threadSleep);
        Thread thread1 = new Thread(threadSleepTask1);
        Thread thread2 = new Thread(threadSleepTask2);
        thread1.start();
        thread2.start();
        thread1.join();
        thread2.join();
        long endTime = System.currentTimeMillis();
        System.out.println(endTime - beginTime);
    }
}

运行结果如下：

测试线程sleep不让出锁

可以看出，当方法上都加同步时候，这是在对象上加锁，当两个线程使用同一个对象时，方法顺序执行，看来sleep方法并没有让出锁。

当把其中一个同步方法拿掉时，运行时间就会缩短，由此看到，sleep时候并不会让出锁，不加锁的方法会正常运行

测试线程sleep不让出锁

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