Think of your personal bank account experience. When in doubt, go for the simplest solution. Try outside in test driven development.

Create a simple banking application with the following features:

• Deposit into an Account
• Withdraw from an Account
• Print a bank statement to the console

Acceptance criteria: Statement should have transactions in the following format:

Print Statement Acceprace Test

Start with a class like this:

public class Account {
    public void Deposit(int amount);
	public void Withdraw(int amount);	
	public void PrintStatement();
}

1. You can not add other public methods
2. For simplicity, use strings and integers for dates and amounts
3. Spaces in formatting can also be ignored

This follows a tutorial from @sandromancuso, see their for other design/implementation constrasins.

• Object Calisthenics pdf
• Object Calisthenics (full book), Jeff Bay in: The ThoughtWorks Anthology. Pragmatic Bookshelf 2008
• Original idea for the kata: How Object-Oriented Are You Feeling Today? - Krzysztof Jelski (Session on the Software Craftsmanship UK 2011 conference)
• Sandro's Kata repository
• A Java verion