Welcome to JavaBank Inc!

A bank transfer system written entirely in Java. Was built in around two days and my primary focuses were to improve my Object Oriented Design as well using Test-Driven Development to create an application in a language I barely know.

A blog post regarding this project can be found here.

Try It Without Downloading Anything:

A live demo is available: https://repl.it/@Kharouk/JavaBank

Just press run.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. Due to the project being a Java application, there are a few prerequisites if you've never launched a Java program on your computer.

Prerequisites

1. Check if you have Java installed. If not, follow the instructions to download Java here.

$ java

2. Once Java is installed/already installed, try running java in your console again.
3. If you see a bunch of info regarding using Java, you're ready.

Setting Up

Time to get the app on your computer!

1. Let's clone the project:

$ git clone https://github.com/Kharouk/java-bank.git
$ cd java-bank

2. Head to the package directory:

$ cd out/production/JavaBank2/

3. If you list inside the directory, you should see:

$ ls
>> META-INF com

4. You're all set up! Now to run the application:

$ java com.javabanktech.Main

5. This launches the Main class of the program. Hopefully, you'll see this:

Tests

Used JUnit 5 as well as Mockito to Test Drive the code. Test files are located at:

cd out/test/JavaBank2/com/javabanktech

If you want to run the tests, open up the files in an IDE like IDEA or a text editor like VSCode:

Requirements as a Technical Challenge

This project was simulated to be like a Technical Challenge. Here was the criteria given in solving this challenge:

• You should be able to interact with your code via a REPL like IRB or the JavaScript console. (You don't need to implement a command line interface that takes input from STDIN.)

• Deposits, withdrawal.

• Account statement (date, amount, balance) printing.

• Data can be kept in memory (it doesn't need to be stored to a database or anything).

Given a client makes a deposit of 1000 on 10-01-2012
And a deposit of 2000 on 13-01-2012
And a withdrawal of 500 on 14-01-2012
When she prints her bank statement
Then she would see:

date || credit || debit || balance
14/01/2012 || || 500.00 || 2500.00
13/01/2012 || 2000.00 || || 3000.00
10/01/2012 || 1000.00 || || 1000.00

Built With

• IDEA - The IDE Used
• Repl.it - Live Demo/Quick Feature Testing
• JUnit - Testing Framework

Acknowledgments

• Hat tip to Makers for providing the technical test
• To the many developers who explain Java a lot better than the docs