JavaDifficulty: Intermediate

Object-Oriented Banking Transaction System

Core Java application demonstrating encapsulation, polymorphism, custom exception hierarchies, and thread-safe collections handling.

JavaOOPCollectionsJUnit 5

Full Architecture & Scope

A robust banking account and ledger transaction simulator built using Java principles. Features immutable transaction records, abstract account classes, interest calculations, and overdraft safety checks.

Architectural Implementation

Strict SOLID principles, custom business exceptions (such as InsufficientFundsException), and synchronized transaction processing.

Required Engineering Deliverables

Abstract class and interface hierarchy for savings, checking, and loan accounts.

Thread-safe in-memory ledger backed by Java Collections Framework.

JUnit 5 test suite verifying transaction atomicity and exception handling.

Repository Access (Simulation)

git clone https://github.com/beyondcollege/java-oop-banking-transaction-system.git

Includes containerized environments, unit test fixtures, and technical documentation.

Sample demonstration repository.

Technical Prerequisites

Core Java syntax, classes, and inheritance.