LockDemo

package cn.sice;

import java.util.ArrayList;
import java.util.Date;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class LockDemo
{

    public static void main(String[] args)
    {
        Res r = new Res();
        In in = new In(r);
        Out out = new Out(r);
        new Thread(in).start();
        new Thread(out).start();
    }

}

class Res
{
    ArrayList<String> arrList = new ArrayList();
    Lock lock = new ReentrantLock();
    Condition conSet = lock.newCondition();
    Condition conGet = lock.newCondition();
    boolean flag = false;

    public void set()
    {
        lock.lock();
        try
        {
            while (flag)
                conSet.await();

            arrList.add(new Date().toString());
            System.out.println("SET----" + arrList.size() + "-- "
                    + arrList.get(arrList.size() - 1) + "  ***  "
                    + Thread.currentThread().getName());
            flag = true;
            conGet.signal();

        } catch (InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }

    }

    public void get()
    {
        lock.lock();
        try
        {
            while (!flag)
                conGet.await();
            System.out.println("GET----" + arrList.size() + "-----"
                    + arrList.get(0) + "  ***  "
                    + Thread.currentThread().getName());
            arrList.remove(0);
            flag = false;
            conSet.signal();
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }
    }
}

class In implements Runnable
{
    public void run()
    {
        while (true)
        {
            r.set();
        }
    }

    private Res r;

    public In(Res r)
    {
        this.r = r;
    }
}

class Out implements Runnable
{
    private Res r;

    public Out(Res r)
    {
        this.r = r;
    }

    public void run()
    {
        while (true)
        {
            r.get();
        }
    }
}