import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class TimerExample extends JPanel implements ActionListener {
private Timer timer = new Timer(100, this);
private JLabel clockLabel;
private Calendar calendar = Calendar.getInstance();
private SimpleDateFormat dateFormat = new SimpleDateFormat("h:mm ss a");
private JProgressBar secondsProgressBar = new JProgressBar(0, 1000);
public TimerExample() {
this.clockLabel = new JLabel("Clock Stopped");
this.clockLabel.setFont(this.clockLabel.getFont().deriveFont(Font.BOLD, 16));
this.clockLabel.setHorizontalTextPosition(JLabel.CENTER);
this.secondsProgressBar.setVisible(false);
this.secondsProgressBar.setForeground(Color.blue);
add(this.clockLabel);
add(secondsProgressBar);
add(new JButton(new ToggleClockAction()));
}
private class ToggleClockAction extends AbstractAction {
private String startClock = "Start Clock";
private String stopClock = "Stop Clock";
private String clockStopped = "Clock Stopped";
public ToggleClockAction() {
super();
putValue(Action.NAME, startClock);
}
public void actionPerformed(ActionEvent e) {
if (TimerExample.this.timer.isRunning()) {
putValue(Action.NAME, startClock);
TimerExample.this.timer.stop();
TimerExample.this.secondsProgressBar.setVisible(false);
TimerExample.this.clockLabel.setText(clockStopped);
} else {
putValue(Action.NAME, stopClock);
// Call Action Performed To Initialize Time Before Timer is Started.
// Null is ok since we ignore the event.
TimerExample.this.actionPerformed(null);
TimerExample.this.secondsProgressBar.setVisible(true);
TimerExample.this.timer.start();
}
}
}
public void actionPerformed(ActionEvent e) {
this.calendar.setTimeInMillis(System.currentTimeMillis());
this.clockLabel.setText(this.dateFormat.format(this.calendar.getTime()));
int milliseconds = this.calendar.get(Calendar.MILLISECOND);
this.secondsProgressBar.setValue(milliseconds);
}
public void endExample() {
this.timer.stop();
}
public static void main(String[] a){
JFrame f = new JFrame();
f.setDefaultCloseOperation(1);
f.add(new TimerExample());
f.pack();
f.setVisible(true);
}
}