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| public class DemoTimer {
private static final long DELAY = 500;
private final JButton startButton;
private final JButton stopButton;
private final JButton pauseOrResumeButton;
private final JLabel label;
private final Timer timer;
private Task timerTask;
private javax.swing.Timer blinkTask;
public DemoTimer() {
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
timer = new Timer();
label = new JLabel("0:00:00", JLabel.CENTER);
frame.add(label);
JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
startButton = new JButton("Start");
startButton.addActionListener(e -> start());
pauseOrResumeButton = new JButton("Pause");
pauseOrResumeButton.addActionListener(e -> pauseOrResume());
pauseOrResumeButton.setEnabled(false);
stopButton = new JButton("Stop");
stopButton.addActionListener(e -> stop());
stopButton.setEnabled(false);
buttonPanel.add(startButton);
buttonPanel.add(pauseOrResumeButton);
buttonPanel.add(stopButton);
frame.add(buttonPanel, BorderLayout.SOUTH);
frame.setSize(400,300);;
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private void start() {
blinkStop();
timerTask = new Task();
timer.schedule(timerTask, 0, DELAY);
startButton.setEnabled(false);
pauseOrResumeButton.setEnabled(true);
stopButton.setEnabled(true);
startButton.setText("Start");
pauseOrResumeButton.setText("Pause");
}
private void pauseOrResume() {
if ( timerTask.isRunning() ) {
pause();
}
else {
resume();
}
}
private void pause() {
timerTask.cancel();
stopButton.setEnabled(true);
startButton.setEnabled(true);
pauseOrResumeButton.setText("Resume");
startButton.setText("Restart");
blinkStart();
}
private void resume() {
blinkStop();
timerTask=new Task(timerTask);
timer.schedule(timerTask, 0, DELAY);
startButton.setEnabled(false);
stopButton.setEnabled(true);
startButton.setText("Start");
pauseOrResumeButton.setText("Pause");
startButton.setText("Start");
}
private void stop() {
timerTask.cancel();
blinkStop();
stopButton.setEnabled(false);
pauseOrResumeButton.setEnabled(false);
startButton.setEnabled(true);
startButton.setText("Start");
pauseOrResumeButton.setText("Pause");
timer.purge();
}
private void blinkStart() {
if ( blinkTask!=null ) {
blinkTask.stop();
}
blinkTask = new javax.swing.Timer((int)DELAY, e-> label.setVisible(!label.isVisible()));
blinkTask.start();
}
private void blinkStop() {
if ( blinkTask!=null ) {
blinkTask.stop();
blinkTask=null;
label.setVisible(true);
}
}
public static void main(String[] args) {
new DemoTimer();
}
private class Task extends TimerTask {
final long start;
private boolean running;
public Task() {
this(System.currentTimeMillis());
}
public Task(Task task) {
this(task.start);
}
public Task(long start) {
this.start=start;
}
@Override
public boolean cancel() {
final boolean cancel = super.cancel();
running=false;
return cancel;
}
public boolean isRunning() {
return running;
}
@Override
public void run() {
running=true;
final long time = System.currentTimeMillis() - start;
final int seconds = (int) (time / 1000);
final String message = String.format("%d:%02d:%02d", seconds / 3600, (seconds % 3600) / 60, (seconds % 60));
SwingUtilities.invokeLater(new Runnable() {
public void run() {
label.setText(message);
}
});
}
};
} |
