CODEWITHSUNDEEP
javaswinguser-interface
victorb3
victorb3

Reputation: 3

Java GUI is frozen but program still running in the terminal

I'm trying to make a simple Java GUI chronometer, but whenever I press the start button the GUI freezes and won't allow me to click the stop button, but the program continues to run perfectly on the terminal.

Here is the code of my start button:

startButton = new JButton();
startButton.setText("START");
startButton.setFont(new Font("RuneScape UF", Font.PLAIN, 16));
startButton.setFocusable(false);
startButton.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startButton) {
            System.out.println("Start button pressed!");
            isRunning = true;
            System.out.println(isRunning);

            long startTime = System.currentTimeMillis();
            while (isRunning) {
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException interruptedException) {
                    interruptedException.printStackTrace();
                }

                long elapsedTime = System.currentTimeMillis() - startTime;
                long elapsedSeconds = elapsedTime / 1000;
                if (elapsedSeconds == 60) {
                    elapsedSeconds = 0;
                    startTime = System.currentTimeMillis();
                }
                if ((elapsedSeconds % 60) == 0) {
                    minutesDisplay++;
                }
                if ((minutesDisplay % 60) == 0 && stupidFix > 0) {
                    stupidFix++;
                    hoursDisplay++;
                }
                //System.out.println(elapsedSeconds);
                String h = String.format("%02d", hoursDisplay);
                String m = String.format("%02d", minutesDisplay);
                String s = String.format("%02d", elapsedSeconds);

                timePassed.setText(h + ":" + m + ":" + s);
                System.out.println(h + ":" + m + ":" + s);
            }
        }
    }
});

Upvotes: 0

Views: 72

Answers (1)

Priyanshu Nautiyal
Priyanshu Nautiyal

Reputation: 26

You are using a while loop inside a button action listener. Using a while loop inside a button action listener is considered a heavy task.You have to use SwingWorker for this.

You can see the tutorial for it here:

https://docs.oracle.com/javase/7/docs/api/javax/swing/SwingWorker.html

Upvotes: 1

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