Java GUI – ToDo App

Project Description

The ToDo App is a simple Java Swing-based desktop application that allows users to add and delete tasks. It demonstrates the use of Swing components, event handling, and layout management in Java GUI development.

Objective

Build a To-Do list using Java Swing that performs basic task management operations.

Tools Used

• Java
• Swing (built-in GUI toolkit)
• IntelliJ IDEA Community Edition or Eclipse

Deliverables

A fully functional Java GUI application that supports adding and deleting tasks from a list.

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Features

• Add tasks to a list
• Delete selected tasks
• Scrollable task list using JScrollPane
• Simple and clean GUI layout

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How to Run

1. Save the code as ToDoApp.java.

2. Open a terminal in the project directory.

3. Compile the file:

   javac ToDoApp.java
   

4. Run the program:

   java ToDoApp

5. The ToDo App window will open where you can add or delete tasks.

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Key Concepts

• Swing Components (JFrame, JPanel, JButton, JTextField, JList, JScrollPane)
• Event Handling using ActionListener
• Layout Management (BorderLayout, GridLayout)
• DefaultListModel for dynamic task management

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Interview Questions and Answers

1. What is Swing?

Swing is a Java GUI toolkit that provides lightweight components for building desktop applications.

2. Difference between AWT and Swing?

AWT is platform-dependent and uses native components, while Swing is platform-independent and provides more flexible, lightweight components.

3. What is ActionListener?

ActionListener is an interface used to handle action events, such as button clicks.

4. How to manage layouts in Java?

Layouts are managed using layout managers like BorderLayout, FlowLayout, and GridLayout to control component placement.

5. What is the Event Dispatch Thread?

The Event Dispatch Thread (EDT) is a special thread that handles all GUI updates and event processing in Swing.

6. What are the GUI components in Java?

Common GUI components include JButton, JLabel, JTextField, JList, JPanel, and JFrame.

7. How to handle multiple events?

You can register multiple event listeners or use anonymous inner classes or lambda expressions to handle different events.

8. What is JPanel vs JFrame?

JFrame represents the main window, while JPanel is a container used to organize and group components within the frame.

9. How to add scroll bar in GUI?

A scrollbar can be added by wrapping components inside a JScrollPane, for example: new JScrollPane(JList).

10. What is MVC architecture?

MVC (Model-View-Controller) separates an application into three layers: Model (data), View (UI), and Controller (logic), improving modularity and maintainability.