Java Swing Pizza Order Form: Complex Form Design

💡 Overview

This project involves creating a full-featured order entry form using the Java Swing framework. The primary goal is to gain practical experience with essential form components (JCheckBox, JRadioButton, JComboBox) and implement the business logic required to calculate and format a detailed receipt for a single pizza order.

🎯 Implementation Goals

This lab demonstrates proficiency in:

1. Designing a complex GUI layout using multiple nested JPanel containers.
2. Implementing interactive input components (JCheckBox, JRadioButton, JComboBox).
3. Managing component state and extracting user selections upon button click.
4. Implementing detailed calculation logic (sub-total, tax, total).
5. Advanced event handling, including using JOptionPane for confirmation dialogues.

🛠️ GUI Component and Layout Breakdown

The application is structured using several JPanel containers, each with a TitledBorder for clear organization:

Panel Focus	Components Used	Notes
Crust Type	JRadioButton set	Options: {Thin, Regular, Deep-dish}. Only one can be selected.
Size	JComboBox	Options: {Small, Medium, Large, Super} with corresponding base costs.
Toppings	JCheckBox set	At least 6 toppings; each adds a fixed cost of $1.00.
Order Display	JTextArea inside a JScrollPane	Displays the final, formatted receipt output.
Controls	JButtons	Order, Clear, and Quit actions.

⚙️ Core Logic and Event Handling

1. Order Button

• Validation: Ensures an order is compiled only if a Crust and Size are selected, and at least one ingredient is chosen.
• Calculation: Gathers all selected prices to calculate the sub-total, applies a 7% tax (.07), and calculates the final total.
• Display: Formats the complete order and cost into a register receipt format displayed in the JTextArea.

2. Clear Button

• Wipes the state of all input components (JRadioButton, JCheckBox, JComboBox) and clears the output JTextArea, preparing the form for a new order.

3. Quit Button

• Exits the application after presenting a confirmation dialogue using JOptionPane.ConfirmMessegeDialog to ensure the user truly wishes to quit.

Receipt Formatting Example

The final output is precisely formatted to mimic a cash register receipt, including bolded labels and divider lines: