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💸 Java OOP Practice - Simple Banking System

This is a Java practice project that simulates a basic banking system using core Object-Oriented Programming (OOP) principles. It was designed to be completed in 120 minutes, focusing on class design, inheritance, encapsulation, polymorphism, and abstraction.

To start the assessment create a branch or clone the repo...Don't push to main##

⏱ Duration

Estimated Time: 120 minutes
Skill Level: Beginner to Intermediate Java

✅ Goal

Build a console-based banking system that allows:

  • Creating customers
  • Creating checking/savings accounts
  • Depositing and withdrawing (with balance stored in cents)
  • Transferring money between accounts
  • Displaying account info and transaction summaries

💡 Requirements

  • Use int for money (cents instead of rand) to avoid floating point errors.
  • Use OOP concepts throughout the project.
  • All functionality must be accessible via a CLI menu in the Main.java.

🔨 Features to Implement

📄 Abstract Class: Account

  • protected String accountNumber
  • protected int balance (in cents)
  • abstract void displayInfo()
  • Methods:
    • deposit(int amountInCents)
    • withdraw(int amountInCents)
    • getBalance()
    • getAccountNumber()

🏦 Subclasses: SavingsAccount and CheckingAccount

  • Inherit from Account
  • Override displayInfo()
  • (Optional) Add withdrawal restrictions in SavingsAccount

👤 Class: Customer

  • Fields:
    • String name
    • String customerId
    • ArrayList<Account> accounts
  • Methods:
    • addAccount(Account account)
    • getAccounts()
    • getName(), getCustomerId()

🔁 Class: BankingService

Handles the business logic:

  • createCustomer(name)
  • createAccount(customerId, type)
  • deposit(customerId, accountNumber, amountInCents)
  • withdraw(customerId, accountNumber, amountInCents)
  • transfer(customerIdFrom, accFrom, customerIdTo, accTo, amountInCents)
  • printCustomerAccounts(customerId)

Use an ArrayList<Customer> for storing data in memory.

🖥️ Class: Main

Console-based interface:

===== Banking Menu =====
1. Create Customer
2. Create Account
3. Deposit
4. Withdraw
5. Transfer
6. View Account Info
7. Exit