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  ×î½üÔÚ×ö½Ó¿ÚµÄʱºò×ÜÊÇÓöµ½Ò»¸öforÓï¾äÖРÿ´ÎÑ­»·»áÉæ¼°ºÜ¶à×ÊÔ´,°üÀ¨ ftp io db,×ÜÏëÓÃÏÖ³¡À´¿ØÖÆÌ«.ÕÒµ½Ò»ÆªÎÄÕ  http://daoger.javaeye.com/blog/142485 Ð´µÄ²»´í.×Ô¼ºÐ´ÁË2¸ödemo
1. Ö÷Ï̲߳»µÈ´ý
 public class CopyOfTestThreadPool {
 public static void main(String args[]) throws InterruptedException {
  // only two threads
  ExecutorService exec = Executors.newFixedThreadPool(20);
  List<Long> list = new ArrayList<Long>();
  for(int index = 0; index < 1000000; index++){
   list.add(System.nanoTime());
  }
  
  long start = System.currentTimeMillis();
  for (Long long1 : list) {
   final Long l = long1;
   exec.execute(new Runnable(){
    public void run() {
     System.out.println(l);
     try {
      Thread.sleep(5000);
     } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
     
    }});
  }
  // must shutdown
  exec.shutdown();
   long end = System.currentTimeMillis();
   System.out.print("¹²¼ÆÓÃʱ ");
   System.out.println(end  - start);
 }
}
2 Ö÷Ï̻߳áµÈ´ý
public class TestCountDownLatch {
 public static void main(String[] args) throws InterruptedException {
  long start = System.currentTimeMillis();
  // ¿ªÊ¼µÄµ¹ÊýËø
  final CountDownLatch begin = new CountDownLatch(1);
  // ½áÊøµÄµ¹ÊýËø
  final CountDownLatch end = new CountDownLatch(10000);
  // Ê®ÃûÑ¡ÊÖ
  final ExecutorService exec = Executors.newFixedThrea


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package sort;

import java.util.Random;

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