class MThreadDemo
{
  static public void main(String[] args)
  {
	  //創建一個新的線程組group01，名稱為ThreadGroup01
	  ThreadGroup group01 = new ThreadGroup("ThreadGroup01");
	  group01.setMaxPriority(4);

	  //創建新線程，并加入到線程組group01中
	  Thread query01 = new Thread(group01,new Query(),"Query01");
	  Thread query02 = new Thread(group01,new Query(),"Query02");
	  Thread query03 = new Thread(group01,new Query(),"Query03");

	  //創建一個新的線程組group02，名稱為ThreadGroup02
	  ThreadGroup group02 = new ThreadGroup("ThreadGroup02");
	  //創建新線程，并加入到線程組group02中
	  Thread transaction01 = new Thread(group02,new Transaction(),"Transaction01");
	  Thread transaction02 = new Thread(group02,new Transaction(),"Transaction02");

	  //向屏幕輸出當前所有線程組的信息
	  System.out.println("============================================" );
	  System.out.println("線程組group01中的線程有：" );
	  group01.list(); //顯示線程組group01中的所有線程
	  System.out.println("線程組group02中的線程有：" );
	  group02.list(); //顯示線程組group01中的所有線程
	  System.out.println("============================================" );

	  query01.start();	//啟動線程
	  query02.start();
	  query03.start();
	  transaction01.start();
	  transaction02.start();
  }
}

class Query implements Runnable
{
	public void run()	//在此處放置處理實際任務的代碼
	{
		//讓線程總共睡眠3次
		for(int cnt = 1; cnt < 6; cnt++)
		{
			try{
				//睡眠一個隨機的毫秒數
				Thread.currentThread().sleep(
					(int)(Math.random() * 100));
				}catch(InterruptedException e){}
				
				//顯示當前線程的信息
				System.out.println(Thread.currentThread() + 
					"運行，次數是：" + cnt);
		}
	}
}

class Transaction implements Runnable
{
	public void run()	//在此處放置處理實際任務的代碼
	{
		//讓線程總共睡眠3次
		for(int cnt = 1; cnt < 6; cnt++)
		{
			try{
				if(cnt>2)
					//睡眠一個隨機的毫秒數
					Thread.currentThread().sleep(
						(int)(Math.random() * 100));
				}catch(InterruptedException e){}
				
				//顯示特定當前的信息
				System.out.println(Thread.currentThread() + 
					"運行，次數是：" + cnt);
		}
	}
}