Java中的notyfy()和notifyAll()的本质区别

package com.thread.wait; 
public class Wait { 
  private int counter = 0; 
  private String name = null; 
  public Wait(int counter,String name){ 
    this.counter = counter; 
    this.name = name; 
  } 
  public synchronized void doSomthing(){ 
    int tempCounter = --counter; 
    if(tempCounter <= 0){ 
      customizedNotifyAll(); 
    } 
    else 
    { 
      while(tempCounter > 0){ 
        try { 
          System.out.println(Thread.currentThread().getName()+"-<"+name+tempCounter+">"+"will invoke WAIT()"); 
          --tempCounter; 
          wait(); 
        } catch (InterruptedException e) { 
          e.printStackTrace(); 
          notifyAll(); 
        } 
        System.out.println(Thread.currentThread().getName()+"-<"+name+tempCounter+">"+"has been ACTIVED"); 
      } 
      customizedNotifyAll(); 
    } 
  } 
  public void customizedNotifyAll(){ 
    notifyAll(); 
    System.out.println(Thread.currentThread().getName()+"-<"+name+counter+">"+"::"+"INVOKED NOTIFYALL() AND FINISHED"); 
  } 
} 

package com.thread.wait; 
public class TestThread implements Runnable { 
  private Wait wait; 
  public TestThread(Wait wait){ 
    this.wait = wait; 
  } 
  public void run() { 
    wait.doSomthing(); 
  } 
  public static void main(String [] args){ 
    Wait wait = new Wait(4,"DAVID"); 
    Thread t1 = new Thread(new TestThread(wait)); 
    Thread t2 = new Thread(new TestThread(wait)); 
    Thread t3 = new Thread(new TestThread(wait)); 
    Thread t4 = new Thread(new TestThread(wait)); 
    t1.start(); 
    t2.start(); 
    t3.start(); 
    t4.start(); 
  } 
} 

Thread-0-<DAVID3>will invoke WAIT() 
Thread-1-<DAVID2>will invoke WAIT() 
Thread-2-<DAVID1>will invoke WAIT() 
Thread-3-<DAVID0>::INVOKED NOTIFYALL() AND FINISHED 
Thread-0-<DAVID2>has been ACTIVED 
Thread-0-<DAVID2>will invoke WAIT() 
Thread-1-<DAVID1>has been ACTIVED 
Thread-1-<DAVID1>will invoke WAIT() 
Thread-2-<DAVID0>has been ACTIVED 
Thread-2-<DAVID0>::INVOKED NOTIFYALL() AND FINISHED 
Thread-0-<DAVID1>has been ACTIVED 
Thread-0-<DAVID1>will invoke WAIT() 
Thread-1-<DAVID0>has been ACTIVED 
Thread-1-<DAVID0>::INVOKED NOTIFYALL() AND FINISHED 
Thread-0-<DAVID0>has been ACTIVED 
Thread-0-<DAVID0>::INVOKED NOTIFYALL() AND FINISHED 

Thread-1-<DAVID3>will invoke WAIT() 
Thread-0-<DAVID2>will invoke WAIT() 
Thread-2-<DAVID1>will invoke WAIT() 
Thread-3-<DAVID0>::INVOKED NOTIFYALL() AND FINISHED 
Thread-1-<DAVID2>has been ACTIVED 
Thread-1-<DAVID2>will invoke WAIT()