java面试题系列3

package queue;

import java.util.concurrent.Semaphore;
import java.util.concurrent.SynchronousQueue;
 
 public class Test {
 
  public static void main(String[] args) {
   
   final Semaphore semaphore = new Semaphore(1);
   final SynchronousQueue<String> queue = new SynchronousQueue<String>();
   
   for(int i = 0; i < 10; i++){
    new Thread(new Runnable(){
     @Override
     public void run() {
      try {
       semaphore.acquire();
       String input = queue.take();
       String output = TestDo.doSome(input);
       System.out.println(Thread.currentThread().getName()+ ":" + output);
       semaphore.release();
      } catch (InterruptedException e) {
       // TODO Auto-generated catch block
       e.printStackTrace();
      }
     }
    }).start();
   }
   
   System.out.println("begin:"+(System.currentTimeMillis()/1000));
   for(int i=0;i<10;i++){  //这行不能改动
    String input = i+"";  //这行不能改动
    try {
     queue.put(input);
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
 }
 
 //不能改动此TestDo类
 class TestDo {
  public static String doSome(String input){
   
   try {
    Thread.sleep(1000);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
   String output = input + ":"+ (System.currentTimeMillis() / 1000);
   return output;
  }
 }