Lock&Condition

package com.ixhong.base.thread;

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

public class ThreeConditionCommunication {

   /**
    * @param args
*/
public static void main(String[] args) {

      final Business business = new Business();
      new Thread(
            new Runnable() {

               @Override
public void run() {

                  for(int i=1;i<=50;i++){
                     business.sub2(i);
                  }

               }
            }
      ).start();

      new Thread(
            new Runnable() {

               @Override
public void run() {

                  for(int i=1;i<=50;i++){
                     business.sub3(i);
                  }

               }
            }
      ).start();    

      for(int i=1;i<=50;i++){
         business.main(i);
      }

   }

   static class Business {
         Lock lock = new ReentrantLock();
         Condition condition1 = lock.newCondition();
         Condition condition2 = lock.newCondition();
         Condition condition3 = lock.newCondition();
        private int shouldSub = 1;
        public  void sub2(int i){
           lock.lock();
           try{
              while(shouldSub != 2){
                 try {
                  condition2.await();
               } catch (Exception e) {
                  // TODO Auto-generated catch block
e.printStackTrace();
               }
              }
               for(int j=1;j<=10;j++){
                  System.out.println("sub2 thread sequence of " + j + ",loop of " + i);
               }
              shouldSub = 3;
              condition3.signal();
           }finally{
              lock.unlock();
           }
        }

        public  void sub3(int i){
           lock.lock();
           try{
              while(shouldSub != 3){
                 try {
                  condition3.await();
               } catch (Exception e) {
                  // TODO Auto-generated catch block
e.printStackTrace();
               }
              }
               for(int j=1;j<=20;j++){
                  System.out.println("sub3 thread sequence of " + j + ",loop of " + i);
               }
              shouldSub = 1;
              condition1.signal();
           }finally{
              lock.unlock();
           }
        }         

        public  void main(int i){
           lock.lock();
           try{
             while(shouldSub != 1){
                  try {
                     condition1.await();
                  } catch (Exception e) {
                     // TODO Auto-generated catch block
e.printStackTrace();
                  }
               }
               for(int j=1;j<=100;j++){
                  System.out.println("main thread sequence of " + j + ",loop of " + i);
               }
               shouldSub = 2;
               condition2.signal();
        }finally{
           lock.unlock();
        }
     }

   }
}

原文链接：[http://wely.iteye.com/blog/2228624]