创建一个递增计时器以中断Java

ClockExample

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JToggleButton;
import javax.swing.Timer;

/** @see https://stackoverflow.com/questions/5528939*/
class ClockExample extends JFrame {

private static final int N = 60;
private static final String stop = \"Stop\";
private static final String start = \"Start\";
private final ClockListener cl = new ClockListener();
private final Timer t = new Timer(1000, cl);
private final JTextField tf = new JTextField(8);

public ClockExample() {
    t.setInitialDelay(0);

    JPanel panel = new JPanel();
    tf.setHorizontalAlignment(JTextField.RIGHT);
    tf.setEditable(false);
    panel.add(tf);
    final JToggleButton b = new JToggleButton(stop);
    b.addItemListener(new ItemListener() {

        @Override
        public void itemStateChanged(ItemEvent e) {
            if (b.isSelected()) {
                t.stop();
                b.setText(start);
            } else {
                t.start();
                b.setText(stop);
            }
        }
    });
    panel.add(b);

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.add(panel);
    this.setTitle(\"Timer\");
    this.pack();
    this.setLocationRelativeTo(null);
    this.setVisible(true);
}

public void start() {
    t.start();
}

private class ClockListener implements ActionListener {

    private int hours;
    private int minutes;
    private int seconds;
    private String hour;
    private String minute;
    private String second;

    @Override
    public void actionPerformed(ActionEvent e) {
        NumberFormat formatter = new DecimalFormat(\"00\");
        if (seconds == N) {
            seconds = 00;
            minutes++;
        }

        if (minutes == N) {
            minutes = 00;
            hours++;
        }
        hour = formatter.format(hours);
        minute = formatter.format(minutes);
        second = formatter.format(seconds);
        tf.setText(String.valueOf(hour + \":\" + minute + \":\" + second));
        seconds++;
    }
}

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            ClockExample clock = new ClockExample();
            clock.start();
        }
    });
  }
}