How do I set Swing Timer initial delay?

The Swing javax.swing.Timer object fires the action event after the delay time specified in the constructor passed. For some reasons you might want the Timer class fires immediately after it was started.

To achieve this you can set the timer initial delay by calling the setInitialDelay(int initialDelay) method. The example below give you an example how to do it.

package org.kodejava.example.swing;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class TimerInitialDelayDemo extends JFrame {
    private JLabel counterLabel = new JLabel();

    private Timer timer = null;

    public TimerInitialDelayDemo() throws HeadlessException {
        initUI();
    }

    private void initUI() {
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(200, 200);

        Container container = getContentPane();
        container.setLayout(new FlowLayout(FlowLayout.CENTER));
        container.add(counterLabel);

        timer = new Timer(1000, new MyActionListener());

        // Set initial delay of the Timer object. Setting initial delay
        // to zero causes the timer fires the event immediately after
        // it is started.
        timer.setInitialDelay(0);
        timer.start();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TimerInitialDelayDemo().setVisible(true);
            }
        });
    }

    class MyActionListener implements ActionListener {
        private int counter = 10;

        public void actionPerformed(ActionEvent e) {
            counter = counter - 1;
            String text = "<html><font size=\"14\">" +
                String.valueOf(counter) +
                "</font></head>";
            counterLabel.setText(text);
            if (counter == 0) {
                timer.stop();
            }
        }
    }
}

How do I add a delay in my program?

You have a problem that you want to add a delay for a couple of seconds in your program. Using Thread.sleep() method we can add delay in our application in a millisecond time. The Thread.sleep() need to be executed inside a try-catch block and we need to catch the InterruptedException. Let’s see the code snippet below.

package org.kodejava.example.lang;

public class DelayExample {
    public static void main(String[] args) {
        // This program demonstrate how to add a delay in our 
        // application.
        for (int i = 0; i < 10; i++) {
            // Print the value of i
            System.out.println("i = " + i);

            try {
                // Using Thread.sleep() we can add delay in our 
                // application in a millisecond time. For the example 
                // below the program will take a deep breath for one 
                // second before continue to print the next value of 
                // the loop.
                Thread.sleep(1000);

                // The Thread.sleep() need to be executed inside a 
                // try-catch block and we need to catch the 
                // InterruptedException.
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }
        }
    }
}