事件：Timer的使用

import  javax.swing. * ;
import  java.awt.event. * ;
public   class  TimerFrame  extends  JFrame ... {
    
    JLabel labelMessage,labelTimer;
    int timePassed;
    JButton buttonStart,buttonStop;
    Timer timer;
    JPanel panel;
    
    public TimerFrame()...{
        super("timer");
        panel=new JPanel();
        labelMessage=new JLabel("timer passed");
        labelTimer=new JLabel();
        buttonStart=new JButton("start");
        buttonStart.addActionListener(new StartListener());
        buttonStop=new JButton("stop");
        buttonStop.addActionListener(new StopListener());
        timer=new Timer(1,new TimerListener());
        
        getContentPane().add(panel);
        panel.add(labelMessage);
        panel.add(labelTimer);
        panel.add(buttonStart);
        panel.add(buttonStop);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        setSize(500,200);
    }
    public static void main(String args[])...{
        new TimerFrame();
    }
    
    class StartListener implements ActionListener...{
        public void actionPerformed(ActionEvent e)...{
            timer.start();
        }
    }
    class StopListener implements ActionListener...{
        public void actionPerformed(ActionEvent e)...{
            timer.stop();
        }
    }
    class TimerListener implements ActionListener...{
        public void actionPerformed(ActionEvent e)...{
            timePassed++;
            labelTimer.setText(String.valueOf(timePassed));
        }
    }
    
    
}