thread

package com.huawei.thread;

import java.util.LinkedList;

public class WorkQueue
{

 private final int nThreads;//线程池的大小

 private final PoolWorker[] threads;//用数组实现线程池

 private final LinkedList queue;//任务队列

 public WorkQueue(int nThreads)
 {
  this.nThreads = nThreads;
  queue = new LinkedList();
  threads = new PoolWorker[nThreads];

  for (int i = 0; i < nThreads; i++)
  {
   threads[i] = new PoolWorker(i);
   try
   {
    threads[i].start();
   } catch (Exception e)
   {
    // TODO 自动生成 catch 块
    e.printStackTrace();
   }//启动所有工作线程
  }
 }

 public void execute(Mytask r)
 {//执行任务
  synchronized (queue)
  {
   
   queue.addLast(r);
   System.out.println("当前队列任务数"+queue.size());
   queue.notify();
  }
 }

 class PoolWorker extends Thread
 {
  private int num;
  PoolWorker(int num)
  {
   this.num = num;
   System.out.println("线程"+num+"启动...");
  }
  //工作线程类
  public void run()
  {
   
   Mytask r;
   while (true)
   {
    synchronized (queue)
    {
     while (queue.isEmpty())
     {//如果任务队列中没有任务，等待
      try
      {
       queue.wait();
      } catch (InterruptedException ignored)
      {
      }
     }
     r = (Mytask) queue.removeFirst();//有任务时，取出任务
    }
    try
    {
     System.out.println("线程"+num+"正在处理"+((Mytask)r).getTasknum());
     r.runTask();//执行任务
     System.out.println("线程"+num+"处理完毕 "+((Mytask)r).getTasknum());
    } catch (RuntimeException e)
    {
     // You might want to log something here
    }
   }
  }
 }

 public static void main(String args[])
 {
  WorkQueue wq = new WorkQueue(10);//10个工作线程
  Mytask r[] = new Mytask[20];//20个任务

  for (int i = 0; i < 20; i++)
  {
   r[i] = new Mytask(i);
   wq.execute(r[i]);
  }
 }

}

package com.huawei.thread;

public class Mytask  //implements Runnable
{//任务接口
     private int tasknum;
    
     Mytask(int num)
     {
      this.tasknum = num;
     }

     public int getTasknum()
     {
      return tasknum;
     }
    
   public void runTask(){
          String name=Thread.currentThread().getName();
          try{
              Thread.sleep(2000);//模拟任务执行的时间
          }catch(InterruptedException e){}
          //System.out.println("任务"+name+" executed OK");
    }

}