Building a Bank Application in Java – A Beginner’s Guide

In this blog, we will walk through a simple Bank Application built using Java. This mini project showcases fundamental Java concepts, including encapsulation, user input handling, and menu-driven programming. Whether you are a beginner or looking to brush up your Java skills, this guide will help you understand how banking transactions work in a basic console-based application.

Understanding the Code Functionality

This Bank Application in Java allows users to:

• Check account balance
• Deposit money
• Withdraw money
• View previous transactions
• Exit the application safely

The code follows an object-oriented approach, where the BankAccount class manages the core banking operations, and the Application class initiates the program.

Key Features of the Code:

Flowchart for Java Bank Application

Start
   │
   ▼
Initialize Scanner
   │
   ▼
Create BankAccount Object
   │
   ▼
Show Menu
   │
   ▼
User Input (Choose Option)
   │
   ├───(A) Check Balance ───> Display Balance ───> Show Menu Again
   │
   ├───(B) Deposit ───> Enter Amount ───> Update Balance ───> Show Menu Again
   │
   ├───(C) Withdraw ───> Enter Amount ───> Update Balance ───> Show Menu Again
   │
   ├───(D) Show Previous Transactions ───> Display Transactions ───> Show Menu Again
   │
   ├───(E) Exit ───> "Thank you for using our bank" ───> End
   │
   └─── Invalid Option ───> Display Error ───> Show Menu Again

✔️ Encapsulation: The account details and transactions are securely stored within a class. ✔️ User Input Handling: The application uses a scanner to take input from the user dynamically. ✔️ Menu-driven Interface: Users can interact with the program using simple keyboard inputs. ✔️ Transaction Tracking: The last transaction (deposit or withdrawal) is recorded and displayed.

Topics Covered in the Code

1. Encapsulation in Java

Encapsulation is a core OOP (Object-Oriented Programming) principle used in this project. The BankAccount class encapsulates account details and restricts direct access to data by using methods like deposit() and withdraw().

2. User Input Handling with Scanner

The program uses Scanner to take user inputs dynamically and store values like name, account ID, and transaction amounts.

3. Conditional Statements and Loops

The do-while loop ensures that users can repeatedly perform banking operations until they choose to exit. The switch statement is used for menu selection.

4. Math.abs() for Transaction Tracking

The Math.abs() method is used to ensure negative values (for withdrawals) are displayed as positive numbers when showing transaction history.

How the Bank Application Works?

1️⃣ The program starts by creating a BankAccount object with a customer name and ID. 2️⃣ The showmenu() method displays the available banking options. 3️⃣ The user selects an option to check balance, deposit, withdraw, or view transaction history. 4️⃣ The account balance updates dynamically based on user actions. 5️⃣ The application runs until the user chooses to exit.

Expected Output:

Welcome sudhapusa
Your ID is: 547

A. Check Balance
B. Deposit
C. Withdraw
D. Previous Transaction
E. Exit
=================
Enter an option:
=================

If a user deposits 500:

Enter the amount to deposit:
Amount Deposited Successfully: 500

If a user withdraws 200:

Enter the amount to withdraw:
Amount Withdrawn Successfully: 200

Project Repository

This Bank Application in Java is published on GitHub:

📌 Feel free to fork the repository, enhance the functionality, and explore Java programming further!

Final Thoughts

If you have any doubts about this Bank Application in Java, comment below this blog, and I will respond. You can also reach out on GitHub or message me on my social handles for help.

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