FinSafe Transaction Validator 🛡️💰 FinSafe is a robust, console-based digital wallet application built with Java. It addresses the business challenge of "Overdraft" errors by implementing real-time transaction validation, custom exception handling, and secure data management.
🚀 Business Case Digital wallets often face synchronization issues where users spend more than their actual balance. FinSafe solves this by:
Enforcing Strict Encapsulation of account data.
Implementing Custom Exception Handling to block unauthorized overdrafts.
Maintaining a Sliding Window History (last 5 transactions) for audit purposes.
🛠️ Features Secure Deposits: Validates that only positive amounts are added.
Safe Withdrawals: Prevents overdrafts using a custom InSufficientFundsException.
Transaction Guard: Uses IllegalArgumentException to block negative or zero-value inputs.
Mini Statement: Displays a history of the last 5 successful withdrawals using the Java Collections Framework.
💻 Tech Stack & Concepts Used Language: Java 17+
OOP Principles: * Encapsulation: Used private access modifiers and public getters to protect sensitive financial data.
Abstraction: Leveraged clear method signatures to hide complex validation logic from the end-user.
Collections: Utilized ArrayList for dynamic transaction tracking.
Error Handling: Implemented try-catch blocks and custom Throwable classes.
📂 Project Structure Plaintext ├── Account.java # Core logic and data management ├── InSufficientFundsException.java # Custom business-logic exception └── FinSafeApp.java # Main entry point and User Interface 📸 Screenshots / Demo Note to Janvi: Run your program in the VS Code terminal and take 2-3 screenshots:
A successful withdrawal.
An error message when you try to withdraw more than your balance.
The Mini Statement after 6 transactions (to show only 5 remain). Paste the images here in your GitHub repo!
⚙️ How to Run Clone this repository.
Open the folder in VS Code.
Compile and run FinSafeApp.java.
Follow the on-screen menu to perform banking operations.
