Java Program to Manage Electronics Products and Washing Machines

Java OOP: Exercise-24 with Solution

Write a Java program to create a class called "ElectronicsProduct" with attributes for product ID, name, and price. Implement methods to apply a discount and calculate the final price. Create a subclass " WashingMachine" that adds a warranty period attribute and a method to extend the warranty.

Sample Solution:

Java Code:

ElectronicsProduct.java

// Define the ElectronicsProduct class
public class ElectronicsProduct {
    // Attributes for the product ID, name, and price
    private String productId;
    private String name;
    private double price;

    // Constructor to initialize the ElectronicsProduct object
    public ElectronicsProduct(String productId, String name, double price) {
        this.productId = productId;
        this.name = name;
        this.price = price;
    }

    // Method to apply a discount to the product price
    public void applyDiscount(double discountPercentage) {
        // Calculate the discount amount
        double discountAmount = price * discountPercentage / 100;
        // Subtract the discount amount from the original price
        price -= discountAmount;
    }

    // Method to calculate the final price after discount
    public double getFinalPrice() {
        // Return the current price which may have been discounted
        return price;
    }

    // Getter for product ID
    public String getProductId() {
        return productId;
    }

    // Getter for name
    public String getName() {
        return name;
    }

    // Getter for price
    public double getPrice() {
        return price;
    }
}

Explanation:

ElectronicsProduct Class:

• Attributes: productId, name, and price.
• Constructor: Initializes the attributes.
• applyDiscount(double discountPercentage): Applies a discount to the product price.
• getFinalPrice(): Returns the final price after the discount.
• Getters: Methods to get the values of the attributes.

WashingMachine.java

// Define the WashingMachine subclass that extends ElectronicsProduct
class WashingMachine extends ElectronicsProduct {
    // Additional attribute for the warranty period
    private int warrantyPeriod; // in months

    // Constructor to initialize the WashingMachine object
    public WashingMachine(String productId, String name, double price, int warrantyPeriod) {
        // Call the superclass constructor to initialize common attributes
        super(productId, name, price);
        this.warrantyPeriod = warrantyPeriod;
    }

    // Method to extend the warranty period
    public void extendWarranty(int additionalMonths) {
        // Add the additional months to the current warranty period
        warrantyPeriod += additionalMonths;
    }

    // Getter for warranty period
    public int getWarrantyPeriod() {
        return warrantyPeriod;
    }

    // Override the display method to include warranty period
    @Override
    public void applyDiscount(double discountPercentage) {
        // Call the superclass method to apply the discount
        super.applyDiscount(discountPercentage);
        // Display a message indicating the discount was applied
        System.out.println("Discount applied to Washing Machine: " + getName());
    }
}

Explanation:

WashingMachine Class:

• Extends ElectronicsProduct.
• Additional Attribute: warrantyPeriod.
• Constructor: Initializes the attributes, calling the superclass constructor for the common attributes.
• extendWarranty(int additionalMonths): Extends the warranty period by the given

Main.java

// Main class to test the ElectronicsProduct and WashingMachine classes
public class Main {
    public static void main(String[] args) {
        // Create an ElectronicsProduct object
        ElectronicsProduct product = new ElectronicsProduct("WM123", "Washing Machine", 1.00);
        // Apply a discount and display the final price
        product.applyDiscount(10);
        System.out.println("Product ID: " + product.getProductId());
        System.out.println("Name: " + product.getName());
        System.out.println("Price after discount: $" + product.getFinalPrice());
        System.out.println();

        // Create a WashingMachine object
        WashingMachine washingMachine = new WashingMachine("W456", "Front Load Washing Machine", 800.00, 24);
        // Apply a discount and display the final price
        washingMachine.applyDiscount(15);
        System.out.println("Product ID: " + washingMachine.getProductId());
        System.out.println("Name: " + washingMachine.getName());
        System.out.println("Price after discount: $" + washingMachine.getFinalPrice());
        // Display the warranty period
        System.out.println("Warranty period: " + washingMachine.getWarrantyPeriod() + " months");

        // Extend the warranty period and display the new warranty period
        washingMachine.extendWarranty(12);
        System.out.println("Warranty period after extension: " + washingMachine.getWarrantyPeriod() + " months");
    }
}

Explanation:

Main Class:

• Creates instances of ElectronicsProduct and WashingMachine and demonstrates the usage of their methods.

Output:

Product ID: WM123
Name: Washing Machine
Price after discount: $900.0

Discount applied to Washing Machine: Front Load Washing Machine
Product ID: W456
Name: Front Load Washing Machine
Price after discount: $680.0
Warranty period: 24 months
Warranty period after extension: 36 months

Java Code Editor:

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