💸 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.

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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

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✅ 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

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💡 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.

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🔨 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()

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🏦 Subclasses: SavingsAccount and CheckingAccount

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

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👤 Class: Customer

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

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🔁 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.

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🖥️ 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