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);}@Overridepublic 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