Sleep示例分析

    sleep让"当前线程"由“运行状态”进入到“休眠(阻塞)状态”,sleep结束,线程重新被唤醒时,它会由“阻塞状态”变成“就绪状态”,从而等待cpu的调度执行。

 

示例分析：

public class TestSleep {

    private static final Object lock = new Object();

    public static void main(String[] args) {
        SleepThread t1 = new SleepThread("t1");
        SleepThread t2 = new SleepThread("t2");
        t1.start();
        t2.start();

        /**
         * sleep让当前线程休眠
         * 让当前线程由“运行状态”进入到“休眠(阻塞)状态”,sleep结束,线程重新被唤醒时,它会由“阻塞状态”变成“就绪状态”,从而等待cpu的调度执行。
         * sleep不会释放lock对象的锁
         */
    }

    static class SleepThread extends Thread {

        public SleepThread(String name) {
            super(name);
        }

        @Override
        public void run() {
            synchronized (lock){
                for (int i = 0; i < 10; i++) {
                    System.err.println(this.getName()+"___"+i);
                    if (i%4==0){
                        System.err.println(this.getName()+"__sleep_"+i);
                        try {
                            sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }
}