Vyshnavi Tellagorla - Hard level tasks

Bank.java

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+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+class Account {
+    private String accountNumber;
+    private String holderName;
+    private double balance;
+
+    public Account(String accountNumber, String holderName, double balance) {
+        this.accountNumber = accountNumber;
+        this.holderName = holderName;
+        this.balance = balance;
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getHolderName() {
+        return holderName;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public void deposit(double amount) {
+        balance += amount;
+    }
+
+    public void withdraw(double amount) {
+        if (amount <= balance) {
+            balance -= amount;
+        } else {
+            System.out.println("Insufficient funds!");
+        }
+    }
+}
+
+public class OnlineBankingSystem {
+    private static Map<String, Account> accounts = new HashMap<>();
+    private static Scanner scanner = new Scanner(System.in);
+
+    public static void main(String[] args) {
+        while (true) {
+            System.out.println("1. Create Account");
+            System.out.println("2. Deposit");
+            System.out.println("3. Withdraw");
+            System.out.println("4. Exit");
+            System.out.print("Choose an option: ");
+            int option = scanner.nextInt();
+            scanner.nextLine();  // Consume newline character
+
+            switch (option) {
+                case 1:
+                    createAccount();
+                    break;
+                case 2:
+                    deposit();
+                    break;
+                case 3:
+                    withdraw();
+                    break;
+                case 4:
+                    System.out.println("Exiting...");
+                    System.exit(0);
+                default:
+                    System.out.println("Invalid option!");
+            }
+        }
+    }
+
+    private static void createAccount() {
+        System.out.print("Enter account number: ");
+        String accountNumber = scanner.nextLine();
+        System.out.print("Enter holder name: ");
+        String holderName = scanner.nextLine();
+        System.out.print("Enter initial balance: ");
+        double balance = scanner.nextDouble();
+        scanner.nextLine();  // Consume newline character
+
+        Account account = new Account(accountNumber, holderName, balance);
+        accounts.put(accountNumber, account);
+        System.out.println("Account created successfully!");
+    }
+
+    private static void deposit() {
+        System.out.print("Enter account number: ");
+        String accountNumber = scanner.nextLine();
+        Account account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.print("Enter deposit amount: ");
+            double amount = scanner.nextDouble();
+            account.deposit(amount);
+            System.out.println("Deposit successful. New balance: " + account.getBalance());
+        } else {
+            System.out.println("Account not found!");
+        }
+    }
+
+    private static void withdraw() {
+        System.out.print("Enter account number: ");
+        String accountNumber = scanner.nextLine();
+        Account account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.print("Enter withdrawal amount: ");
+            double amount = scanner.nextDouble();
+            account.withdraw(amount);
+            System.out.println("Withdrawal successful. New balance: " + account.getBalance());
+        } else {
+            System.out.println("Account not found!");
+        }
+    }
+}

Ecommerce.java

@@ -0,0 +1,166 @@
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+class Product {
+    private int id;
+    private String name;
+    private double price;
+
+    public Product(int id, String name, double price) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+}
+
+class CartItem {
+    private Product product;
+    private int quantity;
+
+    public CartItem(Product product, int quantity) {
+        this.product = product;
+        this.quantity = quantity;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+}
+
+class ShoppingCart {
+    private List<CartItem> items;
+
+    public ShoppingCart() {
+        this.items = new ArrayList<>();
+    }
+
+    public void addItem(CartItem item) {
+        items.add(item);
+    }
+
+    public List<CartItem> getItems() {
+        return items;
+    }
+
+    public double calculateTotal() {
+        double total = 0;
+        for (CartItem item : items) {
+            total += item.getProduct().getPrice() * item.getQuantity();
+        }
+        return total;
+    }
+}
+
+public class ECommercePlatform {
+    private static List<Product> products = new ArrayList<>();
+    private static ShoppingCart cart = new ShoppingCart();
+    private static Scanner scanner = new Scanner(System.in);
+
+    public static void main(String[] args) {
+        initializeProducts();
+
+        while (true) {
+            System.out.println("1. Browse Products");
+            System.out.println("2. Add to Cart");
+            System.out.println("3. View Cart");
+            System.out.println("4. Checkout");
+            System.out.println("5. Exit");
+            System.out.print("Choose an option: ");
+            int option = scanner.nextInt();
+            scanner.nextLine();  // Consume newline character
+
+            switch (option) {
+                case 1:
+                    browseProducts();
+                    break;
+                case 2:
+                    addToCart();
+                    break;
+                case 3:
+                    viewCart();
+                    break;
+                case 4:
+                    checkout();
+                    break;
+                case 5:
+                    System.out.println("Exiting...");
+                    System.exit(0);
+                default:
+                    System.out.println("Invalid option!");
+            }
+        }
+    }
+
+    private static void initializeProducts() {
+        products.add(new Product(1, "Product 1", 10.0));
+        products.add(new Product(2, "Product 2", 20.0));
+        // Add more products here
+    }
+
+    private static void browseProducts() {
+        System.out.println("Available Products:");
+        for (Product product : products) {
+            System.out.println(product.getId() + ". " + product.getName() + " - $" + product.getPrice());
+        }
+    }
+
+    private static void addToCart() {
+        System.out.print("Enter product ID: ");
+        int productId = scanner.nextInt();
+        scanner.nextLine();  // Consume newline character
+        Product selectedProduct = null;
+        for (Product product : products) {
+            if (product.getId() == productId) {
+                selectedProduct = product;
+                break;
+            }
+        }
+        if (selectedProduct != null) {
+            System.out.print("Enter quantity: ");
+            int quantity = scanner.nextInt();
+            scanner.nextLine();  // Consume newline character
+            cart.addItem(new CartItem(selectedProduct, quantity));
+            System.out.println("Item added to cart!");
+        } else {
+            System.out.println("Product not found!");
+        }
+    }
+
+    private static void viewCart() {
+        List<CartItem> items = cart.getItems();
+        if (items.isEmpty()) {
+            System.out.println("Cart is empty.");
+        } else {
+            System.out.println("Cart:");
+            for (CartItem item : items) {
+                System.out.println(item.getProduct().getName() + " - Quantity: " + item.getQuantity());
+            }
+            System.out.println("Total: $" + cart.calculateTotal());
+        }
+    }
+
+    private static void checkout() {
+        System.out.println("Checkout - Total: $" + cart.calculateTotal());
+        System.out.println("Thank you for shopping with us!");
+        // Logic for completing the checkout process (e.g., payment, order creation, etc.) would go here
+        // This is a simplified version without payment integration or order tracking
+        cart = new ShoppingCart(); // Clear the cart after checkout
+    }
+}