1.首先 sleep 方法是Thread类中的静态方法,他的作用是使当前线程暂时睡眠指定的时间,可以不用放在synchronized方法或者代码块中,但是 wait 方法是Object类的方法,它是使当前线程暂时放弃监视对象的使用权进行等待,必须要放在synchronized方法或者代码块中
2.调用线程的sleep 方法当前线程会让出CPU给其他线程执行,但不会释放锁,依然占用锁的使用权,但是 wait方法会释放锁。
3.sleep方法到睡眠指定时间后会自动回复到可运行状态,但是wait方法需要另外一个拥有锁的对象调用 notify 方法进行唤醒,否则将一直挂起。
验证代码如下:
1 package test.main.com; 2 3 public class SleepAndWait { 4 5 6 private static class Thread1 implements Runnable{ 7 @Override 8 public void run() { 9 synchronized (SleepAndWait.class) { 10 System.out.println("thread 1 enter run method..."); 11 System.out.println("thread 1 start waiting..."); 12 try { 13 SleepAndWait.class.wait(); 14 } catch (Exception e) { 15 e.printStackTrace(); 16 } 17 System.out.println("thread 1 ending waiting..."); 18 System.out.println("thread 1 is over..."); 19 } 20 } 21 } 22 23 24 private static class Thread2 implements Runnable{ 25 26 @Override 27 public void run() { 28 synchronized (SleepAndWait.class) { 29 System.out.println("thread 2 enter run method..."); 30 System.out.println("thread 2 sleeping..."); 31 SleepAndWait.class.notifyAll(); 32 33 try { 34 Thread.sleep(10000); 35 } catch (InterruptedException e) { 36 e.printStackTrace(); 37 } 38 39 System.out.println("thread2 is going on...."); 40 System.out.println("thread2 is over!!!"); 41 } 42 } 43 44 } 45 46 public static void main(String[] args) { 47 new Thread(new Thread1()).start(); 48 new Thread(new Thread1()).start(); 49 new Thread(new Thread1()).start(); 50 51 try { 52 System.out.println("main Thread begin sleeping...."); 53 Thread.sleep(8000); 54 System.out.println("main Thread end sleeping...."); 55 } catch (InterruptedException e) { 56 e.printStackTrace(); 57 } 58 59 new Thread(new Thread2()).start(); 60 } 61 62 63 }
java 中 sleep(1000) 和 wait(1000) 的区别?
原文:http://www.cnblogs.com/tuliang/p/6262043.html