import java.awt.Color;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Timer;
public class StopWatch extends JFrame
                               //implements Runnable,
                                                 //                                                 ActionListener
{
    private JTextField text_time;
    private JButton button_start,button_continue,button_stop;
    private JLabel label;
    private Thread thread;
    private JPanel jpanel1,jpanel2;
    private double time = 0.00;
    private Timer timer;

    public StopWatch()
    {
        super("秒表");
        this.setBounds(240,300,240,100);
        this.setBackground(java.awt.Color.lightGray);
        this.setResizable(false);
        this.getContentPane().setLayout(new GridLayout(2,1));

        text_time = new JTextField("0.00",10);
        label = new JLabel("秒");
        jpanel1 = new JPanel();
        jpanel1.setLayout(new FlowLayout(FlowLayout.CENTER));
        jpanel1.add(text_time);
        jpanel1.add(label);
        this.getContentPane().add(jpanel1);

        button_start = new JButton("start");
        button_continue = new JButton("continue");
        button_stop = new JButton("stop");
        jpanel2 = new JPanel();
        jpanel2.add(button_start);
        jpanel2.add(button_continue);
        jpanel2.add(button_stop);
        this.getContentPane().add(jpanel2);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
        timer = new Timer(10,new ActionListener(){
                DecimalFormat formatter = new DecimalFormat("0.00");
                public void actionPerformed(final ActionEvent e){
                    time += 0.01;
                    text_time.setText(formatter.format(time));
                }
            });
        button_start.addActionListener(new ActionListener(){
                public void actionPerformed(final ActionEvent e){
                    time = 0.00;
                    timer.start();
                }
            });
        button_stop.addActionListener(new ActionListener(){
                public void actionPerformed(final ActionEvent e){
                    timer.stop();
                }
            });
        button_continue.addActionListener(new ActionListener(){
                public void actionPerformed(final ActionEvent e){
                    timer.restart();
                }
            });
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new java.lang.Runnable(){
                @Override public void run(){
                    new StopWatch();
                }
            });
    }
}