📚 Java Collection Framework & Generics Examples

This project was developed for the SLIIT Object-Oriented Programming (OOP) module to demonstrate the use of Java Collections Framework and Generics.
It includes two mini applications: BookApp (PriorityQueue) and InventoryApp (HashMap).

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📚 Project Overview

This project showcases how to:

• Use PriorityQueue to manage book titles dynamically.
• Use HashMap to manage a product inventory with unique product codes.
• Apply Generics for type safety and clean object management.

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🧩 Components

1️⃣ BookApp.java

Implements a library management system using a PriorityQueue.

Features

• Accepts book titles until the user types "done".
• Allows removing a specific book by title.
• Displays whether removal was successful or not.
• Counts and prints remaining books in alphabetical order.

Core Concepts

• PriorityQueue for sorted data storage.
• Scanner for input handling.
• Generics for type-safe collection operations.

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2️⃣ InventoryApp.java

Implements a simple inventory system using a HashMap.

Features

• Adds, updates, and removes products.
• Stores product details (code, name, quantity, price).
• Displays complete inventory after each operation.
• Automatically updates products if the code already exists.

Core Concepts

• HashMap for key-value storage.
• Object references as map values.
• Method-based CRUD operations.
• Iteration using enhanced for-loops.

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3️⃣ Tool.java

Helper class defining the product structure with:

• Product code (String)
• Product name (String)
• Quantity in stock (int)
• Price per unit (double)

Used as the value object in the inventory HashMap.

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⚙️ How to Run

Clone the Repository

git clone https://github.com/<your-username>/Java-Collections-Framework-Examples.git
cd Java-Collections-Framework-Examples

🧠 Concepts Demonstrated

| Concept           | Description                               |
| ----------------- | ----------------------------------------- |
| **PriorityQueue** | For ordered book title management         |
| **HashMap**       | For efficient key-value product inventory |
| **Generics**      | For compile-time type safety              |
| **Encapsulation** | Through the Tool (Product) class          |
| **Polymorphism**  | Used via overridden `toString()` methods  |