A fully functional Java 8 Swing desktop banking application built as a baseline for Java modernization exercises.
Nova Bank is a desktop banking system written in Java 8 using Swing for the UI layer. It simulates a real-world retail banking application with customer management, multi-currency accounts, cards, loans, and transaction processing.
This project serves as a modernization baseline — a deliberately "legacy" codebase that can be migrated to modern Java (17/21), Spring Boot, containerized architectures, or cloud-native stacks as a hands-on learning exercise.
| Module | Capabilities |
|---|---|
| Dashboard | Real-time stats: total customers, accounts, balance, recent transactions |
| Customers | Register, search, view details, block/activate. Double-click for profile |
| Accounts | Open checking, savings, investment, business accounts. Freeze/unfreeze/close |
| Transactions | Deposit, withdraw, transfer between accounts with full audit trail |
| Cards | Issue debit/credit cards (Visa, Mastercard, Amex). Block/unblock |
| Loans | Apply for personal, mortgage, auto, business loans. Make repayments |
| Branches | View all bank branch locations and contact details |
- 18 pre-seeded customers with realistic international profiles, accounts, and transaction histories
- Multi-currency support — USD, EUR, ILS, JPY, BRL, GHS, SEK, and more
- Israel timezone (Asia/Jerusalem) — all dates and timestamps displayed as
dd-MM-yyyy HH:mm:ss - Empty-by-default pattern — panels load data only after explicit customer selection
- Bank Nova Bank-inspired color palette — navy blue, white, and orange professional theme
| Layer | Technology |
|---|---|
| Language | Java 8 (JDK 1.8) |
| UI Framework | Java Swing |
| Build Tool | Apache Maven 3.6+ |
| Architecture | MVC (Model–View–Controller) |
| Data Storage | In-memory (no database) |
| Timezone | Asia/Jerusalem |
bank-java-modernization/
├── pom.xml # Maven build configuration
├── docs/ # Documentation and screenshots
│ └── screenshot-customers.png
└── src/main/java/com/bank/
├── BankApplication.java # Entry point
├── config/
│ └── BankConfig.java # Bank branding and constants
├── data/
│ └── DataSeeder.java # Pre-populated sample data (18 customers)
├── exception/ # Custom business exceptions
├── model/ # Domain models
│ ├── Customer.java
│ ├── Account.java
│ ├── Transaction.java
│ ├── Card.java
│ ├── Loan.java
│ ├── Branch.java
│ └── enums/ # AccountType, CardType, LoanType, etc.
├── repository/ # In-memory data repositories
├── service/ # Business logic services
├── ui/ # Swing UI layer
│ ├── MainWindow.java # Main frame, sidebar, theme colors
│ └── panels/ # Dashboard, Customers, Accounts, etc.
└── util/
└── DateUtil.java # Centralized Israel timezone formatting
- Java 8+ (JDK 1.8 or higher)
- Maven 3.6+
# Clone the repository
git clone https://github.com/igor-olikh/bank-java-modernization.git
cd bank-java-modernization
# Build the project
mvn clean package
# Run the application
java -jar target/bank-system.jarThe application window will open with the Dashboard showing aggregated statistics. Navigate using the sidebar on the left.
The system starts with 18 customers from around the world, each with:
- Pre-opened bank accounts (checking, savings, investment, business)
- Issued debit/credit cards
- Transaction history (salary credits, payments, ATM withdrawals, fees)
- Active loans (personal, mortgage, auto)
Member-since dates are randomized between 3–10 years ago for realism. Account opening dates are logically tied to each customer's join date.
| Branch | Location |
|---|---|
| Main Headquarters | New York, USA |
| European HQ | London, UK |
| Asia Pacific Office | Singapore |
| Tel Aviv Branch | Tel Aviv, Israel |
This codebase is intentionally built with Java 8 patterns to provide a realistic migration exercise. Potential modernization targets include:
| Area | Legacy (Current) | Modern Target |
|---|---|---|
| Java Version | Java 8 | Java 17 / 21 (Liberty) |
| UI Framework | Swing | Web UI (React, Angular, or Vaadin) |
| Backend | Monolithic JAR | Spring Boot microservices |
| Data Storage | In-memory collections | JPA + PostgreSQL / MongoDB |
| Build | Maven JAR plugin | Docker containerization |
| Deployment | Desktop JAR | Kubernetes / Cloud Run |
| API Layer | None | REST API (OpenAPI 3.0) |
| Testing | None | JUnit 5 + Mockito |
This project is intended for educational and demonstration purposes.
For questions or contributions, please open an issue on GitHub.