/**
 * 
 */
package com.b510.test;

/**
 * java中的sleep()和wait()的區(qū)別
 * @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 {
    //調(diào)用wait()方法，線程會放棄對象鎖，進(jìn)入等待此對象的等待鎖定池
    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....");
    //只有針對此對象調(diào)用notify()方法后本線程才進(jìn)入對象鎖定池準(zhǔn)備獲取對象鎖進(jìn)入運(yùn)行狀態(tài)。
    TestD.class.notify();
    //==================
    //區(qū)別
    //如果我們把代碼：TestD.class.notify();給注釋掉，即TestD.class調(diào)用了wait()方法，但是沒有調(diào)用notify()
    //方法，則線程永遠(yuǎn)處于掛起狀態(tài)。
    try {
     //sleep()方法導(dǎo)致了程序暫停執(zhí)行指定的時間，讓出cpu該其他線程，
     //但是他的監(jiān)控狀態(tài)依然保持者，當(dāng)指定的時間到了又會自動恢復(fù)運(yùn)行狀態(tài)。
     //在調(diào)用sleep()方法的過程中，線程不會釋放對象鎖。
     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!!!