Java并发之ReentrantLock

package com.lxht.test;import com.lxht.emos.system.seqs.service.SystemSeqsService;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.ReentrantLock;public class TestReenTrantLock {     public static void main(String[] args) {         ReentrantLock reentLock = new ReentrantLock();   //创建ReentrantLock

         /**
           * 创建一个Condition;
           * Condition可以实现原来Object的wait(),和notify(),notifyAll()功能,但为什么要新增一个condition呢?
           * Condition比原来Object.wait()和Object.notify()功能更灵活,一个ReentrantLock可以创建多个Condition，这样不同的线程可以使用不同的Condition.awit()，
           * 这样可以灵活的实现部分线程的唤醒,而不用唤醒全部的线程;
         */
         Condition condition = reentLock.newCondition();        

         ReentrantThread thread1 = new ReentrantThread(reentLock,condition);     

         ReentrantThread thread2 = new ReentrantThread(reentLock,condition);     

         ReentrantThread thread3 = new ReentrantThread(reentLock,condition);    

         thread1.start();      

          thread2.start();     

          thread3.start();         

        try {          

           Thread.sleep(3000); 

        } catch (Exception e) {    

            e.printStackTrace();         

       }       

  try {           

          reentLock.lock();  //加锁,注意:多次调用lock()后需要调用配对的unlock()方法解锁, 如果当前Thread调用了2次lock(),则必须执行2次unlock()   

          System.out.println("singall all is running....");        

          condition.signalAll();  //唤醒condition上所有等待的Thread        

 } catch (Exception e) {           

     e.printStackTrace();        

  } finally {            

      reentLock.unlock(); //释放锁         

    }     

}

}  

class ReentrantThread extends Thread{    

     private ReentrantLock reentrantLock;    

    private Condition condition;    

   public ReentrantThread(ReentrantLock reentrantLock,Condition condition) {        

      this.reentrantLock = reentrantLock;       

     this.condition = condition;    

}    

public void run() {       

      int[] cc = new int[]{0,1,2};        try{           

       reentrantLock.lock();           

    for (int i : cc) {           

      System.out.println(this.getName() + ":" + i);          

    }         

      condition.await(); //当前Thread进入等待状态,这时会释放lock;            

      System.out.println("awiat is end....." + this.getName());       

  } catch (Exception e) {          

    e.printStackTrace();       

   } finally {               

     reentrantLock.unlock();            

 System.out.println("unlock," + this.getName());       

 }  

  }

}