public void actionPerformed(ActionEvent e) {
		if(e.getSource()==ince) {
			ince.setBackground(Color.pink);	//ðťɫ
			stop.setBackground(Color.gray);
			if(!(thread.isAlive())) {
				thread=new Thread(this);
			}
			thread.start();
			b=false;
		}
		if(e.getSource()==stop) {
			ince.setBackground(Color.yellow);
			stop.setBackground(Color.red);
			b=true;
		}
	}