Overview

This project follows Object-Oriented Programming (OOP) principles to create a banking system with different account types and notification methods.

Implementation Steps

• Create a Java Project

  Set up a Java project in your preferred IDE (e.g., IntelliJ IDEA).

• Define the Notification Interface (OCP)

  Create an interface Notification to send messages.

  interface Notification {
      void send(String message);
  }

• Implement Notification Types

  Create three classes implementing Notification:

  • EmailNotification
  • SMSNotification
  • WhatsAppNotification

  Each should override send() to print messages.

  class EmailNotification implements Notification {
      @Override
      public void send(String message) {
          System.out.println("[Email] " + message);
      }
  }

• Define Banking Interfaces (ISP)

  Create three interfaces for account functionalities:

  • DepositAccount → for deposits
  • WithdrawableAccount → for withdrawals
  • BalanceCheck → to check balance

  interface DepositAccount {
      void deposit(double amount);
  }

• Implement Savings Account (LSP)

  Create a SavingsAccount class implementing deposit, withdraw, and balance check.

  class SavingsAccount implements DepositAccount, WithdrawableAccount, BalanceCheck {
      private double balance;
      private Notification notification;
  
      public SavingsAccount(double initialBalance, Notification notification) {
         
      }
  
      @Override
      public void deposit(double amount) {
          balance += amount;
          notification.send("Deposited $" + amount + ". New Balance: $" + balance);
      }
  }

• Implement Loan and Crypto Accounts

  Create:

  • LoanAccount → Can only accept deposits (loan repayments).
  • CryptoAccount → Can only accept deposits (crypto investments).

  Each should notify when a deposit is made.

• Create the Main Class

  In Main.java, test all accounts:

  public class Main {
      public static void main(String[] args) {
          SavingsAccount savings = new SavingsAccount(1000, new EmailNotification());
          savings.deposit(500);
      }
  }

Expected Output

                    
                    === Banking Transactions ===
                    [Email Notification] Deposited $500. New Balance: $1500
                    [Email Notification] Withdrew $200. New Balance: $1300
                    [Email Notification] Withdrawal failed due to insufficient funds!
                    
                    === Loan Repayment ===
                    [SMS Notification] Loan repayment of $1000. Remaining Loan: $4000
                    Loan Balance: $4000
                    
                    === Crypto Account ===
                    [WhatsApp Notification] Crypto deposited $700. New Balance: $700
                    Crypto Balance: $700