线程轮循打印ABC...

 package com.java.concurrent;

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

 /**
  * 使用多线程的方式进行轮循打印ABCABC
  * @author fliay
  *
  */
 public class TestABCAlternate {

     public static void main(String[] args) {
         final AlternateDemo ad = new AlternateDemo();
         new Thread(new Runnable() {

             public void run() {
                 for(int i = ;i<;i++){
                     try {
                         ad.loopA(i);
                     } catch (InterruptedException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     }
                 }
             }
         },"线程1").start();

     new Thread(new Runnable() {

             public void run() {
                 for(int i = ;i<;i++){
                     try {
                         ad.loopB(i);
                     } catch (InterruptedException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     }
                 }
             }
         },"线程2").start();

     new Thread(new Runnable() {

         public void run() {
             for(int i = ;i<;i++){
                 try {
                     ad.loopC(i);
                 } catch (InterruptedException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }
     },"线程3").start();

     }

 }

 class AlternateDemo{

     private int number=;//当前正在执行的线程标记

     private Lock lock = new ReentrantLock();

     private Condition condition1 = lock.newCondition();
     private Condition condition2 = lock.newCondition();
     private Condition condition3 = lock.newCondition();

     public void loopA(int totalLoop) throws InterruptedException{
         lock.lock();
         try{
             //1.判断
             if(number!=){
                 condition1.await();
             }
             //2.打印
             System.out.println(Thread.currentThread().getName()+":A"+"-"+totalLoop);

             //3.唤醒
             number=;
             condition2.signal();
         }finally{
             lock.unlock();
         }
     }

     public void loopB(int totalLoop) throws InterruptedException{
         lock.lock();
         try{
             //1.判断
             if(number!=){
                 condition2.await();
             }
             //2.打印
             System.out.println(Thread.currentThread().getName()+":B"+"-"+totalLoop);

             //3.唤醒
             number=;
             condition3.signal();
         }finally{
             lock.unlock();
         }
     }

     public void loopC(int totalLoop) throws InterruptedException{
         lock.lock();
         try{
             //1.判断
             if(number!=){
                 condition3.await();
             }
             //2.打印
             System.out.println(Thread.currentThread().getName()+":C"+"-"+totalLoop);

             //3.唤醒
             number=;
             condition1.signal();
         }finally{
             lock.unlock();
         }
     }

 }