Session 21

Source Code

import java.util.*;

public class Week21 {
    public static void main(String[] args) {
        String myName = ""; // add your name
        System.out.println("Week 21" + " - " + myName);

        // Menu
        System.out.println("Menu");
        System.out.println("E1 - Example 1");
        System.out.println("Q  - Quit");

        // setup Scanner
        Scanner in = new Scanner(System.in);
        System.out.print("Choice: ");
        String choice = in.nextLine();

        // switch choices
        switch (choice) {
            case "E1":
                System.out.println("Example 1");
                example1();
                break;
            case "E2":
                System.out.println("Example 2");
                example2();
                break;
            case "E3":
                System.out.println("Example 3");
                example3();
                break;
            case "Q":
                System.out.println("Quitting..!");
                break;
        }
    }

    // example1 method
    public static void example1() {
        // Create a Greeter
        
        // Create a MeanGreeter
        

    }

    // example2 method
    public static void example2() {
        // Create a Greeter
        
        // Create a MeanGreeter
        
    }

    // example3 method
    public static void example3() {
        
    }
}

Greeter.java

public class Greeter {
    // greet method no parameters


    // greet method with one parameter

}

MeanGeeter.java

public class MeanGreeter extends Greeter {
    @Override // Compiler will verify this actually overrides a method
    // greet method with no parameters


    
    // greet method with one parameter


}

SocialMediaDemo.java

class SocialMediaUser {
    private String username;
    private String platform;

    // constructor


    // introduce method
    public void introduce() {

    }

    // Getter methods
    public String getUsername() {
        return username;
    }

    public String getPlatform() {
        return platform;
    }
}

class TeenInfluencer extends SocialMediaUser {
    private String contentNiche;
    private int followerCount;

    // constructor


    @Override
    public void introduce() {
       
       

    }

    // Helper method to format follower count (e.g., 1500 -> 1.5K)
    private String formatFollowerCount(int count) {
        if (count >= 1000000) {
            return String.format("%.1fM", count / 1000000.0);
        } else if (count >= 1000) {
            return String.format("%.1fK", count / 1000.0);
        } else {
            return String.valueOf(count);
        }
    }

    // Helper method to add a catchy tagline based on content niche
    private void addTagline() {
        switch (contentNiche.toLowerCase()) {
            case "gaming":
                System.out.println("Let's get this win! #GamerLife");
                break;
            case "fashion":
                System.out.println("Serving looks 24/7! #StyleIcon");
                break;
            case "music":
                System.out.println("Dropping beats and making waves! #MusicLife");
                break;
            case "fitness":
                System.out.println("No pain, no gain! #FitCheck");
                break;
            default:
                System.out.println("Don't forget to like and subscribe! #ContentCreator");
        }
    }
}

public class SocialMediaDemo {
    public static void main(String[] args) {
        // Create a regular social media user


        // Create some teen influencers with different niches


        // Test the introduce methods


    }
}

Customer.java

public class Customer
{
    private String name;
    private String address;

    public Customer(String n, String a)
    {
        name = n;
        address = a;
    }

    public String toString()
    {
        return "Name: " + name + "\nAddress: " + address;
    }

    public static void main(String[] args)
    {
        Customer c = new Customer("Fran Santiago", "123 Main St., Anytown, USA");
        System.out.println(c);

        // Uncomment these to test OnlineCustomer
        // OnlineCustomer c2 = new OnlineCustomer("Jasper Smith",
        //       "456 High St., Anytown, USA", "[email protected]");
        // System.out.println(c2);
    }
}

// Complete the OnlineCustomer class to inherit from Customer
// It should have an email attribute,
// a constructor with 3 arguments (name, address, email) that uses the super
// constructor,
// and an overridden toString() method that calls the super toString() method
//  and then prints "\nEmail:" and the email variable.

class OnlineCustomer
{

}

MoreShapesDemo.java

// Shape class
class Shape {
    // Method to describe the relationship between two shapes


    // Overriding toString() method


}

// Square class
class Square extends Shape {
    // Overriding toString() method


}

// Rectangle class
class Rectangle extends Shape {
    // Overriding toString() method

}

// Main class to demonstrate the relationship method
public class MoreShapesDemo {
    public static void main(String[] args) {
        // Creating Shapes


        // Array of Shapes


        // Demonstrating the relationships
        

    }
}

ShoppingCartDemo.java

import java.util.*;

/**
 * This code is based upon code in
 * https://practiceit.cs.washington.edu/problem/view/bjp4/chapter9/e10-DiscountBill
 */

// Class representing an item with a name and price
class Item {
    private String name; // Name of the item
    private double price; // Price of the item

    // Default constructor initializing item with empty name and price 0.0
    public Item() {
        this.name = "";
        this.price = 0.0;
    }

    // Constructor that initializes item with given name and price
    public Item(String name, double price) {
        this.name = name;
        this.price = price;
    }

    // Method to get the price of the item
    public double getPrice() {
        return price;
    }

    // Method to format a double value to a currency string
    public String valueToString(double value) {
        String result = "" + Math.abs(value);
        if (result.indexOf(".") == result.length() - 2) {
            result += "0";
        }
        result = "$" + result;
        return result;
    }

    // Overriding toString() to return the item name and price as a string
    public String toString() {
        return name + " " + valueToString(price);
    }
}

// DiscountedItem class inheriting from Item
class DiscountedItem extends Item {
    // Instance variable for the discount amount

    // Default constructor initializing discount to 0.0
    

    // Constructor that initializes name, price, and discount
    
    
        // Call the superclass constructor
        

    // Getter method for discount amount
    

    // Setter method for discount amount
    
    
    // Overriding toString() to include discount amount formatted as currency
    
}

// ShoppingCart class to manage a collection of items
class ShoppingCart {
    private ArrayList<Item> order; // List to store items
    private double total; // Total price of items
    private double internalDiscount; // Total discount amount

    // Constructor initializing the cart with an empty order list and zero totals
    public ShoppingCart() {
        order = new ArrayList<Item>();
        total = 0.0;
        internalDiscount = 0.0;
    }

    // Method to add an item to the cart and update totals
    public void add(Item i) {
        order.add(i);
        total += i.getPrice();
        // Check if the item is a discounted item and update discount
        // if (i instanceof DiscountedItem)
        //    internalDiscount += ((DiscountedItem) i).getDiscount();
    }

    // Method to print the order details
    public void printOrder() {
        System.out.println(this);
    }

    // Overriding toString() to return a formatted order summary
    public String toString() {
        return discountToString();
    }

    // Method to format the entire order, including subtotal, discount, and total
    public String discountToString() {
        return orderToString() + "\nSub-total: " + valueToString(total) + "\nDiscount: " + valueToString(internalDiscount) + "\nTotal: " + valueToString(total - internalDiscount);
    }

    // Method to format a double value to a currency string
    private String valueToString(double value) {
        value = Math.rint(value * 100) / 100.0;
        String result = "" + Math.abs(value);
        if (result.indexOf(".") == result.length() - 2) {
            result += "0";
        }
        result = "$" + result;
        return result;
    }

    // Method to build a string representation of all order items
    public String orderToString() {
        String build = "\nOrder Items:\n";
        for (int i = 0; i < order.size(); i++) {
            build += "   " + order.get(i);
            if (i != order.size() - 1) {
                build += "\n";
            }
        }
        return build;
    }
}

// Main class to demonstrate the ShoppingCart functionality
public class ShoppingCartDemo {
    public static void main(String[] args) {
        ShoppingCart cart = new ShoppingCart();
        // Adding regular items to the cart
        cart.add(new Item("bread", 3.25));
        cart.add(new Item("milk", 2.50));

        // Adding discounted items to the cart
        // cart.add(new DiscountedItem("ice cream", 4.50, 1.50));
        // cart.add(new DiscountedItem("apples", 1.35, 0.25));

        // Print the contents of the cart
        cart.printOrder();
    }
}