Java Programming Projects Suite

This repository contains three independent Java programs demonstrating key computer science and software engineering concepts:

• WebCrawler – Networking, I/O, and data structures
• JavaFX GUI Application – Event-driven programming and GUI rendering
• JUnit Test Suite – Unit testing and exception handling

Each project showcases object-oriented design, clean coding, and modular architecture.

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🕸️ WebCrawler

A simple web crawler that takes a user-provided URL, explores its hyperlinks, and prints discovered links to the console.
The program uses Java’s URL and I/O classes to read and process webpage content.

Features

• Reads a starting URL from the user.
• Recursively crawls pages up to 100 links deep.
• Extracts sub-URLs by detecting "http" in HTML lines.
• Uses ArrayLists to track pending and traversed URLs.
• Handles malformed URLs and I/O exceptions gracefully.

Technologies & Concepts

• Java Networking API (java.net.URL)
• I/O and Exception Handling
• Collections Framework (ArrayList)
• OOP and modular design

Example Output

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🎨 JavaFX Application

A JavaFX GUI demo that displays a rectangle, a circle, and a styled text label inside a window.
The program illustrates layout management, shape drawing, and text styling in JavaFX.

Features

• Displays a StackPane containing a rectangle, circle, and label.
• Demonstrates color fills, stroke styling, and font customization.
• Uses scene graph hierarchy and event-driven architecture typical of JavaFX apps.

Technologies & Concepts

• JavaFX API (javafx.scene, javafx.stage, javafx.scene.control)
• Scene Graph and Layouts (StackPane)
• Shapes and Text Rendering
• Event-driven Programming

Example UI

🟧 Orange rectangle background
🟣 Violet circle overlay
🧾 Centered text label “MATT DAVIES” in bold italic Avenir font

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🧪 JUnit Test Suite

A set of JUnit tests for validating the Money class, ensuring reliable addition and exception handling.

Features

• Tests basic addition of money amounts with the same currency.
• Ensures exceptions are correctly thrown for invalid (negative) values.
• Demonstrates Test-Driven Development (TDD) workflow.

Technologies & Concepts

• JUnit 4 Framework
• Assertions and Exception Testing
• OOP and Encapsulation

Example Tests

@Test
public void simpleAdd() throws Exception {
    Money m12CAD = new Money(12, "CAD");
    Money m14CAD = new Money(14, "CAD");
    Money known = new Money(26, "CAD");
    assertTrue(known.equals(m12CAD.add(m14CAD)));
}