public class RunnableDemo implements Runnable 
	{
		String threadName;
		public RunnableDemo(String s) 
		{
	 		System.out.println(" Making thread:" + s);
	  		threadName=s;
		}
	   
	   	public void run() 
	   	{
	      	for(int i=0; i<3; i++) 
	      	{
	         		System.out.println(" Running thread number=" + threadName);
	         		try 
	       		{
	            		Thread.sleep((int)(Math.random() * 1000));
	         		}
	         		catch ( InterruptedException ex ) 
	         		{
	            		System.err.println(ex.toString());
	         		}
	      	}
	   	}
	   
	   	public static void main(String[] args) 
	   	{
	   	 	String download = "downloading";
	   	 	String play = "playing";
	   	 	Thread downloadThread,playThread;
	   	 
	   	 	// 創建線程
	      	downloadThread = new Thread( new RunnableDemo(download) );
	      	playThread = new Thread( new RunnableDemo(play) );
	      
	      	// 啟動線程
	      	downloadThread.start();
	      	playThread.start();
	      
	      	System.out.println("End of main");
	   	}
	}