java 三个线程交替执行

[java]代码库

package cn.itcast.gz;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
 * 第一个线程循环5次，接着第二个线程循环10次，
 * 接着第三个线程循环15次，然后又到第一个线程循环5次
 * 如此往复执行50次
 *
 */
public class Interview3 {

    public static void main(String[] args) {

        ThreadTest3 threadTest3 = new ThreadTest3();

        Thread t1 = new Thread(threadTest3);
        Thread t2 = new Thread(threadTest3);
        Thread t3 = new Thread(threadTest3);

         t1.start();
         t2.start();
         t3.start();

    }   
}

class ThreadTest3 implements Runnable
{

    private Lock lock = new ReentrantLock();
    private int j = 0;
    private int k = 1;

    Condition con1 = lock.newCondition();
    Condition con2 = lock.newCondition();
    Condition con3 = lock.newCondition();

    public void father()
    { 
        lock.lock(); 

        try {           
            while(j!=0)
            con1.await();
            for(int i = 1;i<=5;i++)
            {
                System.out.println("Thread A..."+i);
            }
            j=(j+1)%3;
            con2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally
        {
            lock.unlock();
        }
    }

    public void son()
    {
        lock.lock(); 
        try {
            while(j!=1)
            con2.await();
            for(int i = 1;i<=10;i++)
            {
                System.out.println("Thread B..."+i);
            }
            j=(j+1)%3;
            con3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally
        {
            lock.unlock();
        }
    }

    public void granson()
    {
        lock.lock(); 
        try {
            while(j!=2)
            con3.await();
            for(int i = 1;i<=15;i++)
            {
                System.out.println("Thread C..."+i);
            }
            j=(j+1)%3;
            con1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally
        {
            lock.unlock();
        }
    }

    @Override
    public void run() {

        for(int i = 0;i<3;i++)
        {
            if(k==1)
            {
               father();
               k=(k+1)%3;
            }
            else if(k==2)
             {
               son();
               k=(k+1)%3;
             }
            else
            {
              granson();
              k=(k+1)%3;
            }
        }

    /*  father();
        son();
        granson();*/
    }
}

//源代码片段来自云代码http://yuncode.net