A collection of Java projects — from a full-stack marketplace to focused GUI and OOP exercises. The flagship project is Dikan, an eBay-style online marketplace with a Spring Boot backend and a native Android client.
A full-stack marketplace where anyone can buy and sell — built with a Spring Boot REST API, a native Android client, and a polished bilingual (Persian/English) UI.
Dikan is a complete, eBay-style online marketplace. Sellers can list products with photos, buyers can browse, search, sort, and purchase them, and an administrator can review activity and manage the platform. The repository contains two tightly-coupled apps that work together:
| Folder | Role | Stack |
|---|---|---|
Dikan-Server |
Backend REST API | Java · Spring Boot · SQLite |
Dikan-Android |
Native mobile app | Java · Android SDK · Retrofit |
Built as a university project, Dikan demonstrates an end-to-end product: a database-backed server, a full client, authentication, an admin panel, and a polished bilingual mobile UI.
For buyers
- Register, log in, and recover a forgotten password by email
- Browse product listings with photos, pull-to-refresh, and live search
- Sort results by price (low→high / high→low)
- View product details, call the seller directly, and "buy" with one tap
For sellers
- Create listings with image upload (images are base64-encoded)
- Manage your shop: edit or delete your own ads at any time
For the administrator
- Dashboard with live analytics (products, sellers, total sales, best seller)
- Feature ("star") products to promote them
- Monitor all users and their login activity
Under the hood
- Token-based sessions (UUID) for authentication
- SQLite database with joined user/product relations
- RESTful API consumed by a native Android client via Retrofit
- Bilingual UI (English + Persian) with RTL support
┌──────────────────────┐ HTTP / JSON ┌──────────────────────┐
│ Dikan-Android │ ────────────────────────▶ │ Dikan-Server │
│ (Native client) │ ◀──────────────────────── │ (Spring Boot API) │
└──────────────────────┘ responses └──────────┬───────────┘
│ JDBC
┌─────▼─────────┐
│ SQLite DB │
└───────────────┘
The Android client sends JSON requests over Retrofit; the Spring Boot server exposes REST endpoints that read and write to a SQLite database. Sessions are tracked with per-user UUID tokens.
Backend (Dikan-Server)
cd Dikan-Server
./mvnw spring-boot:runThe API runs on http://localhost:8080/ by default. See the server README for the full endpoint list.
Android app (Dikan-Android)
- Open
Dikan-Androidin Android Studio. - Point the base URL in
Controler.javato your server (defaulthttp://192.168.1.12:8080/). - Build and run on a device or emulator (min SDK 22).
- Java 8 — primary language across the whole stack
- Spring Boot — REST API scaffolding and embedded server
- SQLite + JDBC — lightweight relational storage
- Android SDK — native mobile UI (Material Components)
- Retrofit + Gson — networking and JSON parsing on Android
- TextView, RecyclerView, NavigationView — modern Android layout & navigation
MineSweeper-GUI-Java — A classic 8×8 Minesweeper game with a Swing GUI, built using an OOP Button class and array-backed board logic. 12 mines are shuffled onto the board each round, and the player reveals safe cells to win.
Hospital-Managers-GUI-Java — A Swing-based hospital management system with three modules: Patient records, Admin management, and Accountancy, covering doctor/nurse administration, patient profiles, and sickness submissions.
Pixel-Class-Java — An OOP demo modeling image pixels, where Pixel represents an RGB pixel with validation, a grayscale converter, and hex constructors, and TransparentPixel extends it with an RGBA alpha channel.
university-manager-Command-line — A command-line university manager driven by regex-parsed commands, supporting students, professors, courses, course assignment, enrollment listing, and salary calculation.
This project was created for academic purposes. Feel free to use it as a learning reference.
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