Java计时器

import java.awt.FlowLayout;
import java.awt.event.*;

import javax.swing.*;

public class TimerWin {
    public static void main(String[] args) {
        TimeWin tw = new TimeWin();
    }
}

class TimeWin extends JFrame implements ActionListener {

    JTextField text;
    JButton bStart, bStop, bContinue;
    Timer time;
    int n = 0, start = 1;

    TimeWin() {
        time = new Timer(800, this);
        text = new JTextField(10);
        bStart = new JButton("开始计时");
        bStop = new JButton("暂停计时");
        bContinue = new JButton("继续计时");
        bStart.addActionListener(this);
        bStop.addActionListener(this);
        bContinue.addActionListener(this);
        setLayout(new FlowLayout());
        add(bStart);
        add(bStop);
        add(bContinue);
        add(text);
        setSize(400, 150);
        validate();
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == time) {
            // java.util.Date date=new java.util.Date();
            // String str=date.toString().substring(11, 19);
            n++;
            text.setText("时间：" + n);
        } else if (e.getSource() == bStart) {
            time.start();
            n = 0;
        } else if (e.getSource() == bStop)
            time.stop();
        else if (e.getSource() == bContinue)
            time.restart();
    }

}