本例是阅读Think in Java中相应章节后，自己实际写了一下自己的实现

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;/*假设一个学生，日出而作日落而息*/class Student{    private boolean Awake=false;    public synchronized void wakeUp()    {        Awake=true;        System.out.println("WakeUp!");        notifyAll();    //notifyAll()写在这里！1.临界区 2.已经做了一些改变    }    public synchronized void sleep()    {        Awake=false;        System.out.println("Sleep!");        notifyAll();    //同上    }    public  synchronized void waitForSleep() throws InterruptedException {        while(Awake!=false) wait(); //等待写在这里！1.临界区 2.等待外界改变的条件    }    public  synchronized void waitForAwake() throws InterruptedException{        while(Awake!=true) wait();  //同上    }    public boolean isAwake() {        return Awake;    }}class SunRise implements Runnable{
    //日出    Student student=null;    public SunRise(Student student)    {        this.student=student;    }    @Override public void run()    {        try {            while (!Thread.interrupted()) {                student.waitForSleep(); //先等待环境变化                TimeUnit.MILLISECONDS.sleep(100);                student.wakeUp();       //环境已变化，起床！                System.out.println("End Awake");            }        }catch (InterruptedException e)        {            e.printStackTrace();        }    }}class SunFall implements Runnable{    Student student=null;    public SunFall(Student student)    {        this.student=student;    }    @Override public void run()    {        try{            while (!Thread.interrupted()) {                student.waitForAwake(); //先等待环境变化                TimeUnit.MILLISECONDS.sleep(100);                student.sleep();        //环境已变化，睡觉！                System.out.println("End Sleep");            }        }catch (InterruptedException e)        {            e.printStackTrace();        }    }}public class Main{    public static void main(String[]args)    {        Student me=new Student();        SunRise sunRise=new SunRise(me);        SunFall sunFall=new SunFall(me);        ExecutorService service= Executors.newCachedThreadPool();        service.execute(sunRise);        service.execute(sunFall);     }}

 输出是

WakeUp!End AwakeSleep!End Sleep

的不停循环。

应该算成功了吧。