Java中sleep()与wait()的区别总结

/** *  */package com.b510.test;/** * java中的sleep()和wait()的区别 * @author Hongten * @date 2013-12-10 */public class TestD { public static void main(String[] args) {  new Thread(new Thread1()).start();  try {   Thread.sleep(5000);  } catch (Exception e) {   e.printStackTrace();  }  new Thread(new Thread2()).start(); }  private static class Thread1 implements Runnable{  @Override  public void run(){   synchronized (TestD.class) {   System.out.println("enter thread1...");    System.out.println("thread1 is waiting...");   try {    //调用wait()方法，线程会放弃对象锁，进入等待此对象的等待锁定池    TestD.class.wait();   } catch (Exception e) {    e.printStackTrace();   }   System.out.println("thread1 is going on ....");   System.out.println("thread1 is over!!!");   }  } }  private static class Thread2 implements Runnable{  @Override  public void run(){   synchronized (TestD.class) {    System.out.println("enter thread2....");    System.out.println("thread2 is sleep....");    //只有针对此对象调用notify()方法后本线程才进入对象锁定池准备获取对象锁进入运行状态。    TestD.class.notify();    //==================    //区别    //如果我们把代码：TestD.class.notify();给注释掉，即TestD.class调用了wait()方法，但是没有调用notify()    //方法，则线程永远处于挂起状态。    try {     //sleep()方法导致了程序暂停执行指定的时间，让出cpu该其他线程，     //但是他的监控状态依然保持者，当指定的时间到了又会自动恢复运行状态。     //在调用sleep()方法的过程中，线程不会释放对象锁。     Thread.sleep(5000);    } catch (Exception e) {     e.printStackTrace();    }    System.out.println("thread2 is going on....");    System.out.println("thread2 is over!!!");   }  } }}

enter thread1...thread1 is waiting...enter thread2....thread2 is sleep....thread2 is going on....thread2 is over!!!thread1 is going on ....thread1 is over!!!

TestD.class.notify();

enter thread1...thread1 is waiting...enter thread2....thread2 is sleep....thread2 is going on....thread2 is over!!!