学习实践 JDK5 concurrent 并行包之CountDownLatch

学习实践 JDK5 concurrent 并行包之CountDownLatch

CountDownLatch 类跟CyclicBarrier类似，通过countDown()方法递减，直到为零，所有被它阻塞的线程被唤起执行。
1  package  net.vincent.study.other;
 2 
 3  import  java.util.concurrent.CountDownLatch;
 4 
 5  public   class  part2 {
 6       public   static   void  main(String[] agrs){
 7          CountDownLatch countDownlatch  =   new  CountDownLatch( 2 );
 8           new  testThread( " threadOne " ,countDownlatch).start();
 9           new  testThread( " threadOne " ,countDownlatch).start();
10          
11          
12      }
13  }
14  class  testThread  extends  Thread {
15      CountDownLatch countDownlatch;
16       public  testThread(String threadName,CountDownLatch countDownlatch){
17           super (threadName);
18           this .countDownlatch  =  countDownlatch;
19      }
20       public   void  run(){
21          System.out.print( this .getName() + "   running   " );
22           try  {
23              
24              countDownlatch.countDown();
25              System.out.println( " count is  " + countDownlatch.getCount());
26              countDownlatch.await();
27          }  catch  (InterruptedException e) {
28              e.printStackTrace();
29          }
30          System.out.println( this .getName() + "  Done " );
31      }
32  }
33