Bank Application Documentation

Table of Contents

1. Introduction
2. Project Overview
3. Getting Started
4. Code Structure
5. Features
6. Code Refactoring
7. Usage
8. Compile and Run
9. Author

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1. Introduction

Welcome to the documentation for the Bank Application. This project demonstrates fundamental object-oriented programming concepts in Java, including encapsulation, user input validation, and interactive console-based menus for performing basic banking operations.

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2. Project Overview

The Bank Application allows users to perform the following tasks:

• Deposit money into their account.
• Withdraw money from their account.
• View account balance and previous transactions.
• Calculate interest over a specified period.
• Interact through a user-friendly console-based menu.

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3. Getting Started

Prerequisites

• Java Development Kit (JDK) installed on your system.
• Basic understanding of Java and command-line operations.

Steps

1. Clone or download the project files (Account.java and FirstBank.java).
2. Follow the instructions in Compile and Run to execute the application.

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4. Code Structure

The project consists of the following files:

• Account.java:
  Contains the Account class with methods to handle banking operations like deposit, withdraw, check balance, and calculate interest.

• FirstBank.java:
  Contains the main method to create account instances and display the application menu.

Key Classes and Methods

Account Class

• deposit(int amount): Adds the specified amount to the account balance.
• withdraw(int amount): Subtracts the specified amount from the account balance.
• getPreviousTransaction(): Displays the most recent transaction.
• calculateInterest(int years): Calculates interest over a specified period.
• showMenu(): Displays the main menu for user interaction.

FirstBank Class

• Entry point of the application where accounts are initialized and the menu is displayed.

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5. Features

• Deposit Money: Adds funds to the account and records the transaction.
• Withdraw Money: Deducts funds from the account and records the transaction.
• Check Balance: Displays the current account balance.
• Previous Transaction: Shows the last transaction performed.
• Calculate Interest: Calculates the future balance after applying a fixed interest rate over a specified number of years.
• Interactive Menu: Console-based user interface for navigation and operations.

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6. Code Refactoring

Improvements Made

Encapsulation

• Used private variables and public getter/setter methods to ensure data encapsulation.

User Input Validation

• Added checks to ensure that only valid amounts are deposited or withdrawn.

Menu Options

• Enhanced user experience with clear instructions and error messages for invalid inputs.

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7. Usage

Launch the Application

1. Run the program using the following command:

   java FirstBank

2. Follow the Menu Options Displayed in the Console

• A: Check your account balance.
• B: Deposit money into your account.
• C: Withdraw money from your account.
• D: View your previous transaction.
• E: Calculate interest for a specified number of years.
• F: Exit the application.

Example:

• Deposit 500: Select B and enter 500.
• Withdraw 200: Select C and enter 200.
• Check Balance: Select A.

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8. Compile and Run

Compile the Java Files

To compile the Java files, run the following command:

javac FirstBank.java

Run the Application

To execute the application, run:

java FirstBank

9. Author

This project was developed as a hands-on Java practice to demonstrate fundamental object-oriented programming concepts and banking operations.