java并发:初探sleep方法

sleep与wait

sleep是Thread方法，使得当前线程从运行态变为阻塞态。但它不会释放对象的锁。

wait方法是Object方法，它的作用是使得当前拥有对象锁的线程从运行态变为阻塞态，

它会释放对象的锁

sleep测试

package com.java.javabase.thread.sleep;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class SleepTest {
    private static int coutsize = 10;
    private static Object obj = new Object();

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

    static class ThreadOne extends Thread {
        public ThreadOne(String name){
            super(name);
        }
        @Override
        public void run() {
            synchronized (obj){
                int i = 0;
                try {
                    while (i < coutsize) {

                        log.info("current thread is : {} sleep {} times ",Thread.currentThread().getName(),i++);

                        Thread.sleep(300);
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        }

    }
}

说明

对于拥有同一个Object对象的两个线程，当一个线程持有对象的锁，虽然多次执行Thread，线程从运行态变为阻塞态，但也不会释放对象的锁，

其他的线程只能等待。

测试结果

2019-07-29 16:49:22,156   [t1] INFO  SleepTest  - current thread is : t1 sleep 0 times
2019-07-29 16:49:22,469   [t1] INFO  SleepTest  - current thread is : t1 sleep 1 times
2019-07-29 16:49:22,782   [t1] INFO  SleepTest  - current thread is : t1 sleep 2 times
2019-07-29 16:49:23,094   [t1] INFO  SleepTest  - current thread is : t1 sleep 3 times
2019-07-29 16:49:23,407   [t1] INFO  SleepTest  - current thread is : t1 sleep 4 times
2019-07-29 16:49:23,720   [t1] INFO  SleepTest  - current thread is : t1 sleep 5 times
2019-07-29 16:49:24,032   [t1] INFO  SleepTest  - current thread is : t1 sleep 6 times
2019-07-29 16:49:24,345   [t1] INFO  SleepTest  - current thread is : t1 sleep 7 times
2019-07-29 16:49:24,658   [t1] INFO  SleepTest  - current thread is : t1 sleep 8 times
2019-07-29 16:49:24,970   [t1] INFO  SleepTest  - current thread is : t1 sleep 9 times
2019-07-29 16:49:25,283   [t2] INFO  SleepTest  - current thread is : t2 sleep 0 times
2019-07-29 16:49:25,596   [t2] INFO  SleepTest  - current thread is : t2 sleep 1 times
2019-07-29 16:49:25,909   [t2] INFO  SleepTest  - current thread is : t2 sleep 2 times
2019-07-29 16:49:26,221   [t2] INFO  SleepTest  - current thread is : t2 sleep 3 times
2019-07-29 16:49:26,534   [t2] INFO  SleepTest  - current thread is : t2 sleep 4 times
2019-07-29 16:49:26,847   [t2] INFO  SleepTest  - current thread is : t2 sleep 5 times
2019-07-29 16:49:27,159   [t2] INFO  SleepTest  - current thread is : t2 sleep 6 times
2019-07-29 16:49:27,472   [t2] INFO  SleepTest  - current thread is : t2 sleep 7 times
2019-07-29 16:49:27,785   [t2] INFO  SleepTest  - current thread is : t2 sleep 8 times
2019-07-29 16:49:28,098   [t2] INFO  SleepTest  - current thread is : t2 sleep 9 times