Java - How To Create a CountDown Timer In Java Netbeans

How to Create a CountDown Timer App In Java Netbeans

In this Java Tutorial we will see How To Make a CountDown Timer With Minutes and Seconds Numbers In Netbeans.

What We Are Gonna Use In This Project:

- Java Programming Language.
- NetBeans Editor.

What This Project Do:

- This app lets users set a countdown in minutes and seconds, then start the timer.

- The timer counts down and updates the display every second, showing the remaining time from the specified initial time.

- After reaching zero on the countdown, the timer stops, and a 'Time's Up!' message is shown.

Project Source Code:

package new_tutorials;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

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.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

import javax.swing.SwingUtilities;

import javax.swing.Timer;

public class CountDownTimer {

    private int minutes = 0;

    private int seconds = 0;

    

    private Timer timer;

    private JLabel timerLabel;

    private JButton startButton;

    private JTextField minutesField, secondsField;

    

    public CountDownTimer(){

        

        // Create the main JFrame

        JFrame frame = new JFrame("Count Down Timer");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(350, 250);

        frame.getContentPane().setBackground(Color.white);

        frame.setLocationRelativeTo(null);

        

        // Create the content panel with BorderLayout

        JPanel contentPanel = new JPanel();

        contentPanel.setLayout(new BorderLayout());

        

        // Create and configure the timer label

        timerLabel = new JLabel("Time remaining: 00:00");

        timerLabel.setHorizontalAlignment(SwingConstants.CENTER);

        timerLabel.setFont(new Font("Helvetica", Font.BOLD, 20));

        timerLabel.setForeground(Color.DARK_GRAY);

        

        // Create the input panel for timer values

        JPanel inputPanel = new JPanel();

        inputPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));

        inputPanel.setBackground(Color.white);

        

        // Create input fields and start button

        minutesField = new JTextField(2);

        secondsField = new JTextField(2);

        startButton = new JButton("Start Timer");

        startButton.setBackground(new Color(30, 144, 255));

        startButton.setForeground(Color.white);

        startButton.setFocusPainted(false);

        startButton.setBorderPainted(false);

        

        // Add action listener for the start button

        startButton.addActionListener(new ActionListener(){

            @Override

            public void actionPerformed(ActionEvent e) {

            

               startTimer();

            

            }

        });

        

        // Add components to input panel

        inputPanel.add(new JLabel("Minutes:"));

        inputPanel.add(minutesField);

        inputPanel.add(new JLabel("Seconds:"));

        inputPanel.add(secondsField);

        inputPanel.add(startButton);

        

        // Add components to content panel

        contentPanel.add(timerLabel, BorderLayout.CENTER);

        contentPanel.add(inputPanel, BorderLayout.SOUTH);

        

        // Add content panel to the main JFrame

        frame.add(contentPanel);

        frame.setVisible(true);

                

    }

    

    private void startTimer(){

        // Stop the existing timer if it's running

        if(timer != null && timer.isRunning())

        {

            timer.stop();

        }

        

        try

        {

            // Parse input values for minutes and seconds

          minutes = Integer.parseInt(minutesField.getText());

          seconds = Integer.parseInt(secondsField.getText());

        }

        catch(NumberFormatException ex)

        {

            JOptionPane.showMessageDialog(null, "Invalid input. Please enter valid minutes and seconds.");

            return;

        }

        

        int totalSeconds = minutes * 60 + seconds + 1;

        

        

        // Create a new timer with an ActionListener

        timer = new Timer(1000, new ActionListener() {

            int count = totalSeconds;

            @Override

            public void actionPerformed(ActionEvent e) {

                

                count--;

                

                if(count >= 0)

                {

                  int remainningMinutes = count/60;

                  int remainningSeconds = count%60;

                  timerLabel.setText(String.format("Time Remaining: %02d:%02d", remainningMinutes, remainningSeconds));

                }

                else

                {

                  timer.stop();

                  timerLabel.setText("Time's Up!");

                }

                

            }

        });

        

        timer.start();  // Start the timer

        

    }

    

    

    public static void main(String[] args){

        

        SwingUtilities.invokeLater(()-> new CountDownTimer());

        

    }

    

    

}

The Final Result:

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