Designed for the AUEB CS BSc Java Course
This repository contains a collection of Java programming examples used for teaching core object-oriented programming (OOP) concepts in an engaging and applied way. Each example is organized as a separate package/module, and includes working code, documentation, and console interaction.
Each top-level package contains a complete, runnable Java example:
A full implementation of the Monty Hall game:
- OOP structure (
Door,MontyHallGame,Strategy) - Interactive version (console-based)
- Simulator to run thousands of trials
- Visual comparison of strategies (switch vs stay)
➡️ Teaches: classes, interfaces, composition, simulations, user interaction
A pedestrian routing system on a city grid:
- Location graph representation
- Obstacle-aware pathfinding
- Modular packages:
model,routing,map,simulation
➡️ Teaches: graphs, modular design, file input, BFS-style logic
Demonstrates the difference between:
Math.random()(static, simple, no seed)Randomclass (object-based, supports seeding)- Repeatable pseudo-randomness
➡️ Teaches: randomness, testing, debugging with seeded values
Simulates a basic hotel booking system with multiple room types.
➡️ Teaches: inheritance, encapsulation, polymorphism
Loads movie reviews from a file and filters recommendations by genre, rating, or sentiment.
➡️ Teaches: file I/O, ArrayList, filtering, basic NLP
Use the terminal or your favorite IDE (e.g., IntelliJ, Eclipse):
# Compile from src root
javac montyhall/app/Main.java
java montyhall.app.Main
# Or run another example
javac randomdemo/RandomComparison.java
java randomdemo.RandomComparisonTo contribute to this repo, this cheatsheet may help with the first steps.
This project is licensed under the MIT License.