class aa implements Runnable{
    private String name;
    public aa(String name){
    	this.name=name;
    }
    public void run()
    {
    	for(int i=0;i<3;i++)
    		System.out.println("執行緒開始："+this.name+", i="+i);
    }
}

public class zz {

	/**
	 * @param args
	 */
		public static void main(String[] args) throws Exception {
			aa mt1=new aa("執行緒a");
			aa mt2=new aa("執行緒b");
			Thread t1=new Thread(mt1);
			t1.start();
			t1.join();  //做完此執行緒至退出，程式才繼續進行。
			Thread t2=new Thread(mt2);
			t2.start();
		}
}