java线程池的使用

import  java.util.concurrent.ExecutorService;
import  java.util.concurrent.Executors;
import  java.util.concurrent.ScheduledExecutorService;
import  java.util.concurrent.ScheduledFuture;
import  java.util.concurrent.TimeUnit;


/**/ /*
 * 学习使用JDK5以上的线程池操作
 */

public   class  ThreadPool  {

    public static void main(String[] args)
    {
            /**//*
             * 可以安排线程运行时间
             * 
             */
        
            final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);
            final Runnable beeper = new Runnable() 
            {     
                int count = 0; 
                public void run() 
                {        
                    System.out.println( " beep " + (++count));
                    
                }    
            };
            final ScheduledFuture<?> beeperHandle = scheduler.scheduleAtFixedRate(beeper, 1, 2,TimeUnit.SECONDS);
            
            scheduler.schedule(new Runnable() 
                                {      
                                    public void run()
                                    {        
                                        beeperHandle.cancel(true);   
                                        scheduler.shutdown();
                                    }    
                                }, 200, TimeUnit.SECONDS
                                );
            /**//*
             * 不可以安排线程的运行时间
             */
            ExecutorService    exec = Executors.newFixedThreadPool(2);    
            for(int index = 0; index < 200; index++) 
            {
                Runnable run = new Runnable()
                {
                    public void run() 
                    {   long time =(long)(Math.random() * 1000);
                        System.out.println("Sleeping " + time + "ms");
                        try { 
                            Thread.sleep(time);
                            } catch (InterruptedException e)
                            {           
                                
                            }        
                    }
                };
                exec.execute(run);    
            }
            exec.shutdown();  
    
    }
    
    
}