I don't know how to display timer when stopped

Question

How are you all doing? I have a little problem with my code. When I stop my timer program, it will say \"Done!\" since I set it to \"Done\", but I would like to display the

Answer 1

but I would like to display the remaining time instead of the word "Done".

Change timerLabel.setText("Done!"); to timerLabel.setText(counter);?

I should point out that because of it's nature, Swing Timer is not entirely accurate and you should be focusing the amount of time that has passed and not how often the timer has been called. This of course comes entirely down to how accurate you want the count to be of course, but it's worth knowing (IMHO)

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public static class TestPane extends JPanel {

        private JLabel label;
        private JButton button;

        private Timer timer;
        private long startedAt;

        public static final int RUN_TIME = 5000;

        public TestPane() {
            label = new JLabel("...");
            button = new JButton("Start");
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridwidth = GridBagConstraints.REMAINDER;

            add(label, gbc);
            add(button, gbc);

            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (timer == null) {
                        button.setText("Stop");
                        startedAt = System.currentTimeMillis();
                        timer = new Timer(500, new ActionListener() {
                            @Override
                            public void actionPerformed(ActionEvent e) {
                                long diff = System.currentTimeMillis() - startedAt;
                                if (diff >= RUN_TIME) {
                                    label.setText("Out of time; Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
                                    timer.stop();
                                    button.setText("Start");
                                } else {
                                    label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
                                }
                            }
                        });
                        label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
                        timer.start();
                    } else {
                        timer.stop();
                        long diff = System.currentTimeMillis() - startedAt;
                        label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
                        button.setText("Start");
                        timer = null;
                    }
                }
            });
        }

        public int remainingTime() {
            long diff = System.currentTimeMillis() - startedAt;
            return (int) Math.round((RUN_TIME - diff) / 1000d);
        }

        public int usedTime() {
            long diff = System.currentTimeMillis() - startedAt;
            return (int) Math.round(diff / 1000d);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(300, 200);
        }

    }

}