2025

Java Development, Team Project

UML Architectural Planning & Financial Logic

The Simple Banking System was engineered to emphasize clean code standards, defensive programming, and structured software planning before execution.

System Design & Development Workflow

  • UML Modeling & Architecture: Designed comprehensive UML class diagrams prior to writing code to define entity relationships, encapsulation boundaries, and inheritance hierarchies.

  • Core Banking Features: Engineered modular transaction methods for automated account creation, balance calculations, deposits, and withdrawal processing.

  • Transaction Validation Logic: Implemented input validation algorithms to prevent negative balance states, invalid deposit amounts, and unauthorized overdraft attempts.

  • Collaborative Development: Utilized IntelliJ IDEA for version control and clean code formatting across team modules.

Mission

Mission

To design a secure, Object-Oriented Java banking engine by modeling system relationships through UML and enforcing strict transaction validation logic.

To design a secure, Object-Oriented Java banking engine by modeling system relationships through UML and enforcing strict transaction validation logic.

Challenge

Challenge

Financial software requires strict data accuracy and boundary checking. Designing a system to handle state changes—such as preventing withdrawals that exceed account balances or handling invalid input parameters—requires robust error checking and well-structured class relationships to prevent runtime bugs.

Financial software requires strict data accuracy and boundary checking. Designing a system to handle state changes—such as preventing withdrawals that exceed account balances or handling invalid input parameters—requires robust error checking and well-structured class relationships to prevent runtime bugs.

Solution

Solution

Mapped out the class architecture using UML before implementation to ensure clean separation of responsibilities. Built encapsulated Java objects representing accounts and transactions, equipped with conditional validation checks to maintain data integrity during all financial operations.

Mapped out the class architecture using UML before implementation to ensure clean separation of responsibilities. Built encapsulated Java objects representing accounts and transactions, equipped with conditional validation checks to maintain data integrity during all financial operations.

Result

Result

Developed as a team project at Indiana University Indianapolis, this Simple Banking System models essential financial transaction workflows using Java and IntelliJ IDEA. The system provides core banking capabilities—including account creation, real-time balance tracking, deposits, withdrawals, and transaction validation rules. Prior to implementation, the team utilized Unified Modeling Language (UML) diagrams to architect object relationships, class inheritance, and system flow, ensuring clean code structure and robust data management.

Developed as a team project at Indiana University Indianapolis, this Simple Banking System models essential financial transaction workflows using Java and IntelliJ IDEA. The system provides core banking capabilities—including account creation, real-time balance tracking, deposits, withdrawals, and transaction validation rules. Prior to implementation, the team utilized Unified Modeling Language (UML) diagrams to architect object relationships, class inheritance, and system flow, ensuring clean code structure and robust data management.