java线程池简单例子

package ThreadPool;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

public class ThreadPool  {
	private BlockingQueue blockingQueue;
	private int poolSize;
	private int workSize;
	public ThreadPool(int size)
	{	
		poolSize = size;
		workSize = 0;
		blockingQueue = new LinkedBlockingQueue();
	}
	public synchronized void excute(Runnable t)
	{	
		if(workSize == poolSize)
		{
           blockingQueue.add(t);
			notify();
		}
		else 
		{
			new Thread(new WorkThread("线程"+workSize,t)).start();
			workSize = workSize + 1;
		}
	}
	public synchronized Runnable getTask () throws InterruptedException
	{
		if(blockingQueue.size() == 0)
		{
			wait();
		}
		return blockingQueue.poll();
	}
	private class WorkThread implements Runnable
	{
		private String threadName;
		private Runnable firstRunnable;
		public WorkThread(String name,Runnable t)
		{
			this.firstRunnable = t;
			this.threadName = name;
		}
		@Override
		public void run() {
			// TODO Auto-generated method stub
			while(true)
			{
				try {
					if(firstRunnable != null)
					{
						System.out.println(threadName + "运行中");
						firstRunnable.run();
						firstRunnable =  null;
					}
					else 
					{
						Runnable runnable = getTask();
						if(runnable == null)return;
						System.out.println(threadName + "运行中");
						runnable.run();
					}
					Thread.sleep(3000);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
			}
		}
		
	}
}