final redemption

SWING
1. CheckBox:
import javax.swing.*;
import java.awt.event.*;

class CheckBox {
    JFrame f;
    JLabel label;
    JCheckBox checkbox1, checkbox2;
    JList<String> list1, list2; // Define JList components

    CheckBox() {
        f = new JFrame("CheckBox Demo");
        label = new JLabel();
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setSize(400, 100);
        checkbox1 = new JCheckBox("C++");
        checkbox1.setBounds(150, 100, 50, 50);
        checkbox2 = new JCheckBox("Java");
        checkbox2.setBounds(150, 150, 50, 50);
        f.add(checkbox1);
        f.add(checkbox2);
        f.add(label);

        checkbox1.addItemListener(new ItemListenerDemo(this));
        checkbox2.addItemListener(new ItemListenerDemo(this));

        f.setSize(400, 400);
        f.setLayout(null);
        f.setVisible(true);
    }

    public static void main(String args[]) {
        new CheckBox();
    }
}

class ItemListenerDemo implements ItemListener {
    CheckBox cbd;

    ItemListenerDemo(CheckBox cbd) {
        this.cbd = cbd;
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        String data = "";
        if (cbd.list1.getSelectedIndex() != -1) {
            data = "Programming language Selected: " + cbd.list1.getSelectedValue();
            cbd.label.setText(data);
        }
        if (cbd.list2.getSelectedIndex() != -1) {
            data += ", Framework Selected: ";
            for (Object frame : cbd.list2.getSelectedValuesList()) {
                data += frame + " ";
            }
        }
        cbd.label.setText(data);
    }
}

2. Border Layout:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class BorderLayoutDemo {
    JFrame f;
    JButton b1;
    JButton b2;
    JButton b3;
    JButton b4;
    JLabel jl;

    public BorderLayoutDemo() {
        f = new JFrame();

        // Creating buttons
        b1 = new JButton("NORTH");
        b2 = new JButton("SOUTH");
        b3 = new JButton("EAST");
        b4 = new JButton("WEST");
        jl = new JLabel("Label@CENTER");

        f.add(b1, BorderLayout.NORTH);
        f.add(b2, BorderLayout.SOUTH);
        f.add(b3, BorderLayout.EAST);
        f.add(b4, BorderLayout.WEST);
        f.add(jl, BorderLayout.CENTER);

        b1.addActionListener(new MyActionListener(this));
        b2.addActionListener(new MyActionListener(this));
        b3.addActionListener(new MyActionListener(this));
        b4.addActionListener(new MyActionListener(this));

        f.setSize(300, 300);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        new BorderLayoutDemo();
    }
}

class MyActionListener implements ActionListener {
    BorderLayoutDemo bld;

    MyActionListener(BorderLayoutDemo bld) {
        this.bld = bld;
    }

    public void actionPerformed(ActionEvent ae) {
        bld.jl.setText(ae.getActionCommand());
    }
}

3. Card Layout:
import java.awt.*;
import javax.swing.*;

class CardLayoutDemo extends JFrame
{
javax.swing.JButton b1;
JButton b2;
JButton b3;
JButton b4;
Container c;
CardLayout cl;
CardLayoutDemo()
{
    b1 = new javax.swing.JButton("NORTH");
    b2 = new JButton("SOUTH");
    b3 = new JButton("EAST");
    b4 = new JButton("WEST");

    c = getContentPane();
    cl = new CardLayout(40,30);
    c.setLayout(cl);

    c.add(b1);
    c.add(b2);
    c.add(b3);
    c.add(b4);

    b1.addActionListener(new MyActionListener(this));
    b2.addActionListener(new MyActionListener(this));
    b3.addActionListener(new MyActionListener(this));
    b4.addActionListener(new MyActionListener(this));

    setSize(300, 300);
    setVisible(true);
}
public static void main(String[] args) {
    new CardLayoutDemo();
}
}

class MyActionListener implements java.awt.event.ActionListener {
  CardLayoutDemo cld;
  MyActionListener(CardLayoutDemo cld){
     this.cld = cld;
  }
  public void actionPerformed(java.awt.event.ActionEvent ae){
    cld.cl.next(cld.c);
  }
}

4. Box Layout:
import javax.swing.*;

class BoxLayoutDemo extends JFrame
{
javax.swing.JButton b1;
JButton b2;
JButton b3;
JButton b4;
JLabel jl;
BoxLayoutDemo()
{
    b1 = new javax.swing.JButton("NORTH");
    b2 = new JButton("SOUTH");
    b3 = new JButton("EAST");
    b4 = new JButton("WEST");
    jl = new JLabel("LABEL@CENTRE");

    add(b1);
    add(b2);
    add(b3);
    add(b4);
    add(jl);

    setLayout (new javax.swing.BoxLayout(getContentPane(), javax.swing.BoxLayout.Y_AXIS));

    b1.addActionListener(new MyActionListener(this));
    b2.addActionListener(new MyActionListener(this));
    b3.addActionListener(new MyActionListener(this));
    b4.addActionListener(new MyActionListener(this));

    setSize(300, 300);
    setVisible(true);
}
public static void main(String[] args) {
    new BoxLayoutDemo();
}
}

class MyActionListener implements java.awt.event.ActionListener {
  BoxLayoutDemo bld;
  MyActionListener(BoxLayoutDemo bld){
     this.bld = bld;
  }
  public void actionPerformed(java.awt.event.ActionEvent ae){
    bld.jl.setText(ae.getActionCommand());
  }
}

-------------------------------------------------------------------------------------------------------------
2. Multilevel Inheritance:
// Base class representing a product
class Product {
    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public void displayProductInfo() {
        System.out.println("Product: " + name);
        System.out.println("Price: $" + price);
    }
}

// Subclass representing electronic products
class Electronics extends Product {
    private String brand;

    public Electronics(String name, double price, String brand) {
        super(name, price);
        this.brand = brand;
    }

    public String getBrand() {
        return brand;
    }

    @Override
    public void displayProductInfo() {
        super.displayProductInfo();
        System.out.println("Brand: " + brand);
    }
}

// Subclass representing laptops
class Laptop extends Electronics {
    private String processor;

    public Laptop(String name, double price, String brand, String processor) {
        super(name, price, brand);
        this.processor = processor;
    }

    public String getProcessor() {
        return processor;
    }

    @Override
    public void displayProductInfo() {
        super.displayProductInfo();
        System.out.println("Processor: " + processor);
    }
}

public class Multi {
    public static void main(String[] args) {
        // Create a Laptop object
        Laptop laptop = new Laptop("Dell XPS 13", 1299.99, "Dell", "Intel Core i7");

        // Display product information
        laptop.displayProductInfo();
    }
}
------------
3. Exception Handling:
import java.util.Scanner;

class InvalidCreditCardException extends Exception {
    public InvalidCreditCardException(String message) {
        super(message);
    }
}

public class CCValidate {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter your 16-digit credit card number: ");
        String creditCardNumber = scanner.nextLine();

        try {
            if (isValidCreditCard(creditCardNumber)) {
                System.out.println("Credit card is valid.");
            } else {
                System.out.println("Credit card is invalid.");
            }
        } catch (InvalidCreditCardException e) {
            System.out.println("Invalid Credit Card: " + e.getMessage());
        }

        scanner.close();
    }

    public static boolean isValidCreditCard(String cardNumber) throws InvalidCreditCardException {
        if (cardNumber == null || cardNumber.length() != 16) {
            throw new InvalidCreditCardException("Credit card number must be exactly 16 digits long.");
        }

        return true;
    }
}
-------------
4. Multi-threading:
class MultithreadingDemo extends Thread {
    public void run() {
        try {
            // Displaying the thread name that is running
            System.out.println(
                "Thread " + Thread.currentThread().getName()
                + " is running");
        } catch (Exception e) {
            // Throwing an exception
            System.out.println("Exception is caught");
        }
    }
}

public class exp7 {
    public static void main(String[] args) {
        int n = 8; // Number of threads
        for (int i = 0; i < n; i++) {
            MultithreadingDemo object = new MultithreadingDemo();
            object.start(); // Note the lowercase 'start' method
        }
    }
}
--------------------
5. Interfaces:
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

// Define the Product interface
interface Product {
    String getName();
    double getPrice();
}

// Implement the Product interface for Electronics
class Electronics implements Product {
    private String name;
    private double price;

    public Electronics(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public double getPrice() {
        return price;
    }
}

// Implement the Product interface for Clothing
class Clothing implements Product {
    private String name;
    private double price;

    public Clothing(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public double getPrice() {
        return price;
    }
}

public class Interface {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Product> shoppingCart = new ArrayList<>();

        while (true) {
            System.out.println("Select a product category:");
            System.out.println("1. Electronics");
            System.out.println("2. Clothing");
            System.out.println("3. Checkout");

            int choice = scanner.nextInt();

            if (choice == 1) {
                System.out.print("Enter electronics name: ");
                String name = scanner.next();
                System.out.print("Enter price: ");
                double price = scanner.nextDouble();
                shoppingCart.add(new Electronics(name, price));
            } else if (choice == 2) {
                System.out.print("Enter clothing name: ");
                String name = scanner.next();
                System.out.print("Enter price: ");
                double price = scanner.nextDouble();
                shoppingCart.add(new Clothing(name, price));
            } else if (choice == 3) {
                break;
            } else {
                System.out.println("Invalid choice. Please select 1, 2, or 3.");
            }
        }

        double totalCost = calculateTotalCost(shoppingCart);
        System.out.println("Total cost of items in the shopping cart: $" + totalCost);

        scanner.close();
    }

    public static double calculateTotalCost(List<Product> shoppingCart) {
        double totalCost = 0.0;
        for (Product item : shoppingCart) {
            totalCost += item.getPrice();
        }
        return totalCost;
    }
}
-------------
6. Multiple Array:
import java.util.Scanner;

public class ECommerceDemo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int maxSize = 100;
        String[] productNames = new String[maxSize];
        double[] productPrices = new double[maxSize];
        int[] productQuantities = new int[maxSize];
        int cartSize = 0;

        while (true) {
            System.out.println("E-commerce Management System");
            System.out.println("1. Add Product to Cart");
            System.out.println("2. View Cart");
            System.out.println("3. Calculate Total Cost");
            System.out.println("4. Exit");

            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            switch (choice) {
                case 1:
                    System.out.print("Enter Product Name: ");
                    String productName = scanner.nextLine();
                    System.out.print("Enter Product Price: $");
                    double productPrice = scanner.nextDouble();
                    System.out.print("Enter Quantity: ");
                    int quantity = scanner.nextInt();

                    productNames[cartSize] = productName;
                    productPrices[cartSize] = productPrice;
                    productQuantities[cartSize] = quantity;
                    cartSize++;
                    break;
                case 2:
                    System.out.println("Your Shopping Cart:");
                    for (int i = 0; i < cartSize; i++) {
                        System.out.println(
                            productNames[i] + " - $" + productPrices[i] + " x " + productQuantities[i]
                        );
                    }
                    break;
                case 3:
                    double totalCost = 0.0;
                    for (int i = 0; i < cartSize; i++) {
                        totalCost += productPrices[i] * productQuantities[i];
                    }
                    System.out.println("Total Cost: $" + totalCost);
                    break;
                case 4:
                    System.out.println("Thank you for using our e-commerce system.");
                    scanner.close();
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please select a valid option.");
                    break;
            }
        }
    }
}
--------------------------------------------------------------------------------------------------------------
Packages:
//packages
//Main.java
import ecommerce.Product;
import ecommerce.Order;
import ecommerce.ShoppingCart;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ShoppingCart cart = new ShoppingCart();

        while (true) {
            System.out.print("Enter product ID (0 to finish): ");
            int productId = scanner.nextInt();
            if (productId == 0) {
                break;
            }

            System.out.print("Enter product name: ");
            scanner.nextLine(); // Consume the newline character
            String productName = scanner.nextLine();

            System.out.print("Enter product price: ");
            double productPrice = scanner.nextDouble();

            System.out.print("Enter quantity: ");
            int quantity = scanner.nextInt();

            Product product = new Product(productId, productName, productPrice);
            cart.addProduct(product, quantity);
        }

        // Display the contents of the shopping cart
        System.out.println("Shopping Cart Contents:");
        cart.displayCart();

        // Create an order from the shopping cart
        Order order = new Order(cart);

        // Display the order details
        System.out.println("\nOrder Details:");
        order.displayOrder();

        scanner. Close();
    }
}

//ecommerce/Product.java
package ecommerce;

public 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;
    }

    // Getters and setters for id, name, and price
    public String toString() {
        return name + " (ID: " + id + ", Price: Rs. " + price + ")";
    }
}

//ecommerce/Order.java
package ecommerce;

import java.util.Date;

public class Order {
    private ShoppingCart cart;
    private Date orderDate;

    public Order(ShoppingCart cart) {
        this.cart = cart;
        this.orderDate = new Date();
    }

    public void displayOrder() {
        System.out.print("Order Date: " + orderDate);
        System.out.println("\n");
        System.out.println("Order Items:");
        cart.displayCart();
    }
}

//ecommerce/ShoppingCart.java
package ecommerce;

import java.util.HashMap;
import java.util.Map;

public class ShoppingCart {
    private Map<Product, Integer> items;

    public ShoppingCart() {
        items = new HashMap<>();
    }

    public void addProduct(Product product, int quantity) {
        items.put(product, quantity);
    }

    public void displayCart() {
        for (Map.Entry<Product, Integer> entry : items.entrySet()) {
            Product product = entry.getKey();
            int quantity = entry.getValue();
            System.out.println(product + " x" + quantity);
        }
    }
}
--------------------------------------------------------------------------------------------------------------------------
MASTER-----!!!!!
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner;

// Base class representing a product
class Product {
    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public void displayProductInfo() {
        System.out.println("Product: " + name);
        System.out.println("Price: $" + price);
    }
}

// Subclass representing electronic products
class Electronics extends Product {
    private String brand;

    public Electronics(String name, double price, String brand) {
        super(name, price);
        this.brand = brand;
    }

    public String getBrand() {
        return brand;
    }

    @Override
    public void displayProductInfo() {
        super.displayProductInfo();
        System.out.println("Brand: " + brand);
    }
}

// Subclass representing laptops
class Laptop extends Electronics {
    private String processor;

    public Laptop(String name, double price, String brand, String processor) {
        super(name, price, brand);
        this.processor = processor;
    }

    public String getProcessor() {
        return processor;
    }

    @Override
    public void displayProductInfo() {
        super.displayProductInfo();
        System.out.println("Processor: " + processor);
    }
}

class InvalidCreditCardException extends Exception {
    public InvalidCreditCardException(String message) {
        super(message);
    }
}

class CCValidate {
    public static boolean isValidCreditCard(String cardNumber) throws InvalidCreditCardException {
        if (cardNumber == null || cardNumber.length() != 16) {
            throw new InvalidCreditCardException("Credit card number must be exactly 16 digits long.");
        }
        return true;
    }
}

class MultithreadingDemo extends Thread {
    public void run() {
        try {
            System.out.println(
                "Thread " + Thread.currentThread().getName() + " is running"
            );
        } catch (Exception e) {
            System.out.println("Exception is caught");
        }
    }
}

// Define the Product interface
interface ProductInterface {
    String getName();
    double getPrice();
}

// Implement the Product interface for Electronics
class ElectronicsInterface implements ProductInterface {
    private String name;
    private double price;

    public ElectronicsInterface(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public double getPrice() {
        return price;
    }
}

// Implement the Product interface for Clothing
class ClothingInterface implements ProductInterface {
    private String name;
    private double price;

    public ClothingInterface(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public double getPrice() {
        return price;
    }
}

public class Master {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int maxSize = 100;
        String[] productNames = new String[maxSize];
        double[] productPrices = new double[maxSize];
        int[] productQuantities = new int[maxSize];
        int cartSize = 0;

        JFrame f = new JFrame("CheckBox Demo");
        JLabel label = new JLabel();
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setSize(400, 100);
        JCheckBox checkbox1 = new JCheckBox("C++");
        checkbox1.setBounds(150, 100, 50, 50);
        JCheckBox checkbox2 = new JCheckBox("Java");
        checkbox2.setBounds(150, 150, 50, 50);
        f.add(checkbox1);
        f.add(checkbox2);
        f.add(label);

        checkbox1.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                if (checkbox1.isSelected()) {
                    label.setText("Programming language Selected: C++");
                }
            }
        });

        checkbox2.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                if (checkbox2.isSelected()) {
                    label.setText("Programming language Selected: Java");
                }
            }
        });

        f.setSize(400, 400);
        f.setLayout(null);
        f.setVisible(true);

        while (true) {
            System.out.println("E-commerce Management System");
            System.out.println("1. Add Product to Cart");
            System.out.println("2. View Cart");
            System.out.println("3. Calculate Total Cost");
            System.out.println("4. Exit");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.print("Enter Product Name: ");
                    String productName = scanner.nextLine();
                    System.out.print("Enter Product Price: $");
                    double productPrice = scanner.nextDouble();
                    System.out.print("Enter Quantity: ");
                    int quantity = scanner.nextInt();

                    productNames[cartSize] = productName;
                    productPrices[cartSize] = productPrice;
                    productQuantities[cartSize] = quantity;
                    cartSize++;
                    break;
                case 2:
                    System.out.println("Your Shopping Cart:");
                    for (int i = 0; i < cartSize; i++) {
                        System.out.println(
                            productNames[i] + " - $" + productPrices[i] + " x " + productQuantities[i]
                        );
                    }
                    break;
                case 3:
                    double totalCost = 0.0;
                    for (int i = 0; i < cartSize; i++) {
                        totalCost += productPrices[i] * productQuantities[i];
                    }
                    System.out.println("Total Cost: $" + totalCost);
                    break;
                case 4:
                    System.out.println("Thank you for using our e-commerce system.");
                    scanner.close();
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please select a valid option.");
                    break;
            }
        }
    }
}