Developing a To-Do List App with Java


A to-do list app is a practical tool for managing tasks and staying organized. Java is a versatile programming language for developing such applications. In this guide, we'll walk you through the process of building a to-do list app with Java, covering essential concepts and providing sample code to get you started on your development journey.


Before you start building a to-do list app in Java, make sure you have the following prerequisites:

  • Java Development Kit (JDK) installed on your computer.
  • An integrated development environment (IDE) for Java, such as IntelliJ IDEA or Eclipse.
  • Basic knowledge of Java programming concepts.

Designing the To-Do List App

The first step in building a to-do list app is designing its user interface and functionality. Consider the features you want to include, such as adding tasks, marking them as complete, and organizing them into categories.

Sample Java Code for a To-Do List App

Below is a simplified example of Java code for a basic to-do list app. This code demonstrates how to create a simple application that allows users to add tasks to a list and mark them as complete.

Java Code (To-Do List App):

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ToDoListApp {
public static void main(String[] args) {
JFrame frame = new JFrame("To-Do List App");
frame.setSize(400, 300);
DefaultListModel<String> toDoListModel = new DefaultListModel<>();
JList<String> toDoList = new JList<>(toDoListModel);
JTextField taskInput = new JTextField();
JButton addTaskButton = new JButton("Add Task");
JButton completeTaskButton = new JButton("Complete Task");
addTaskButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String task = taskInput.getText();
if (!task.isEmpty()) {
completeTaskButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int selectedIndex = toDoList.getSelectedIndex();
if (selectedIndex != -1) {
JPanel inputPanel = new JPanel(new BorderLayout());
inputPanel.add(taskInput, BorderLayout.CENTER);
inputPanel.add(addTaskButton, BorderLayout.EAST);
JPanel buttonPanel = new JPanel(new BorderLayout());
buttonPanel.add(completeTaskButton, BorderLayout.EAST);
frame.add(new JScrollPane(toDoList), BorderLayout.CENTER);
frame.add(inputPanel, BorderLayout.NORTH);
frame.add(buttonPanel, BorderLayout.SOUTH);

Building the To-Do List App

To build a to-do list app in Java, follow these steps:

  1. Set up your Java project and create the user interface using Swing components.
  2. Implement event listeners to handle user interactions, such as adding and completing tasks.
  3. Enhance the app by adding features like task categories, due dates, and data persistence.
  4. Test your to-do list app to ensure it functions as expected and is user-friendly.


Building a to-do list app in Java is a practical project that allows you to gain experience in GUI development and event handling. Whether you're developing a simple personal task tracker or a more sophisticated project management tool, Java provides the flexibility to create an application that suits your needs.