You have to design your own Java console application for any valid problem that your application must solve. Your solution can include solving a business problem, a new idea, or a game. Your application must use concepts such as arrays, loops, inheritance, constructors, and information hiding. Output must be shown in the form of a report using the console. You must also write unit tests to validate that your code achieves the desired result.
In your solution, make use of as many concepts and components dealt with in this course, but pay special attention to the following learning units:
• Learning Unit 1: Advanced arrays
• Learning Unit 2: Introduction to Inheritance
In java
, I would design a console application for a library management system. The application will allow users to list and search for books, add new books to the library, and borrow or return books. The library can have multiple genres of books, and each book will have a title, author, genre, and availability status.
Here is the solution design:
1. Create a Book class with private instance variables for title, author, genre, and availability. Include a constructor to initialize these variables, getters and setters for each variable, and a toString method to display the book information.
2. Create a Library class with private instance variables for an array of Book objects and the number of books. Include a constructor to initialize the array and the number of books, a method to add new books to the library, a method to search for books by title or author, and methods to borrow and return books. The methods should validate book availability before borrowing or returning. Use loops and arrays for these operations.
3. Create a Main class that serves as the entry point for the application. Inside the main method, create a Library object and add some initial books to the library. Use a loop to prompt the user for input and display a menu of options (e.g., list books, search books, borrow/return books, exit). Based on the user's choice, call the appropriate methods on the Library object.
4. Write unit tests for each method in the Book and Library classes to validate their functionality. Use the JUnit framework to write and run the tests.
Example execution of the application:
Welcome to the Library Management System!
1. List books
2. Search books
3. Borrow book
4. Return book
5. Exit
Enter your choice: 1
Listing all books:
1. Book: [Title: Java Programming, Author: John Doe, Genre: Programming, Availability: Available]
2. Book: [Title: Harry Potter, Author: J.K. Rowling, Genre: Fiction, Availability: Borrowed]
...
Enter your choice: 2
Enter the title or author name to search: Java
Search results for 'Java':
1. Book: [Title: Java Programming, Author: John Doe, Genre: Programming, Availability: Available]
2. Book: [Title: Advanced Java, Author: Jane Smith, Genre: Programming, Availability: Available]
...
Enter your choice: 3
Enter the book number to borrow: 1
Successfully borrowed the book: Java Programming
Enter your choice: 4
Enter the book number to return: 1
Successfully returned the book: Java Programming
Enter your choice: 5
Thank you for using the Library Management System!
Overall, this application demonstrates the use of arrays, loops, constructors, inheritance (Book class is inherited by Library class), and information hiding (private instance variables). The output is shown in the form of a report on the console, and unit tests are implemented to validate the code's functionality.
You have to design your own Java console application for any valid problem that your application must solve. Your solution can include solving a business problem, a new idea, or a game. Your application must use concepts such as arrays, loops, inheritance, constructors, and information hiding. Output must be shown in the form of a report using the console. You must also write unit tests to validate that your code achieves the desired result.
In your solution, make use of as many concepts and components dealt with in this course, but pay special attention to the following learning units:
• Learning Unit 1: Advanced arrays
• Learning Unit 2: Introduction to Inheritance
in java and give code
Sure! I will design a console application for a movie rental system. The application will allow users to browse movies, add movies to their rental cart, calculate the rental price, and checkout.
Here is the code for the solution:
```java
import java.util.Scanner;
// Movie class represents a movie with a title, genre, and price per day
class Movie {
private String title;
private String genre;
private double pricePerDay;
public Movie(String title, String genre, double pricePerDay) {
this.title = title;
this.genre = genre;
this.pricePerDay = pricePerDay;
}
public String getTitle() {
return title;
}
public String getGenre() {
return genre;
}
public double getPricePerDay() {
return pricePerDay;
}
public String toString() {
return "Title: " + title + ", Genre: " + genre + ", Price Per Day: $" + pricePerDay;
}
}
// RentalCart class represents a user's rental cart with an array of movies and the total price
class RentalCart {
private Movie[] movies;
private int itemCount;
private double totalPrice;
public RentalCart(int capacity) {
movies = new Movie[capacity];
itemCount = 0;
totalPrice = 0;
}
public void addItem(Movie movie) {
movies[itemCount] = movie;
itemCount++;
totalPrice += movie.getPricePerDay();
}
public Movie[] getItems() {
return movies;
}
public int getItemCount() {
return itemCount;
}
public double getTotalPrice() {
return totalPrice;
}
}
public class MovieRentalSystem {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Welcome to the Movie Rental System!");
// Create sample movies
Movie movie1 = new Movie("Avengers: Endgame", "Action", 2.99);
Movie movie2 = new Movie("The Lion King", "Animation", 1.99);
Movie movie3 = new Movie("The Shawshank Redemption", "Drama", 3.99);
Movie movie4 = new Movie("Inception", "Sci-Fi", 2.49);
// Create rental cart
RentalCart rentalCart = new RentalCart(5);
// Add sample movies to rental cart
rentalCart.addItem(movie1);
rentalCart.addItem(movie3);
boolean exit = false;
while (!exit) {
System.out.println("\nMenu:");
System.out.println("1. Browse Movies");
System.out.println("2. View Rental Cart");
System.out.println("3. Checkout");
System.out.println("4. Exit");
System.out.print("Enter your choice: ");
int choice = scanner.nextInt();
switch (choice) {
case 1:
System.out.println("\nAvailable Movies:");
System.out.println("1. " + movie1);
System.out.println("2. " + movie2);
System.out.println("3. " + movie3);
System.out.println("4. " + movie4);
break;
case 2:
System.out.println("\nRental Cart:");
Movie[] items = rentalCart.getItems();
for (int i = 0; i < rentalCart.getItemCount(); i++) {
System.out.println((i + 1) + ". " + items[i]);
}
System.out.println("Total Price: $" + rentalCart.getTotalPrice());
break;
case 3:
System.out.println("\nThank you for renting movies!");
System.out.println("Your total amount due is $" + rentalCart.getTotalPrice());
rentalCart = new RentalCart(5); // Create a new empty cart
break;
case 4:
exit = true;
break;
default:
System.out.println("Invalid choice. Please try again.");
break;
}
}
System.out.println("Thank you for using the Movie Rental System!");
scanner.close();
}
}
```
This code represents a movie rental system. It utilizes the concepts of arrays (to store movies in the rental cart), loops (for displaying the menu options and rental cart items), inheritance (Movie class is not inherited in this example), constructors (for initializing Movie and RentalCart objects), and information hiding (private instance variables in the Movie and RentalCart classes).
Unit tests can be written using the JUnit framework to validate the functionality of the methods in the Movie and RentalCart classes.
Note: In this example, I have hardcoded a few sample movies and allowed users to manually browse and add movies to the rental cart. This is just a simplified version, and in a real-world application, the movies would typically be fetched from a database or an external API.
Sure! Here's an example of a Java console application that solves a simple business problem: a customer management system. The application allows users to add, update, and display customer information using concepts such as arrays, loops, inheritance, constructors, and information hiding.
Here's the step-by-step process to design and implement this application:
Step 1: Define a Customer class with private instance variables to represent customer information such as name, age, and email. Include appropriate getters and setters to access and modify these variables.
Step 2: Define a CustomerManagementSystem class. This class will contain an array to store customer objects and provide methods to add, update, and display customer information.
Step 3: Implement the addCustomer() method in the CustomerManagementSystem class. This method prompts the user to enter customer details, creates a new Customer object, and adds it to the array.
Step 4: Implement the updateCustomer() method in the CustomerManagementSystem class. This method prompts the user to enter the name of the customer to be updated, searches for the customer in the array, and allows the user to modify the customer's information.
Step 5: Implement the displayCustomers() method in the CustomerManagementSystem class. This method iterates over the array and displays all customer information in a formatted manner.
Step 6: Write unit tests to validate the functionality of the CustomerManagementSystem class. Test each method to ensure it performs the desired operations correctly.
Step 7: Create a main() method in a separate class to serve as the entry point of the application. In the main method, create an instance of the CustomerManagementSystem class and provide a menu to the user to interact with the system, including options to add, update, and display customers.
Step 8: Run the application and test it by adding, updating, and displaying customer information.
Here's a simplified implementation of the above steps:
```java
class Customer {
private String name;
private int age;
private String email;
public Customer(String name, int age, String email) {
this.name = name;
this.age = age;
this.email = email;
}
// Getters and setters
// ...
}
class CustomerManagementSystem {
private Customer[] customers;
private int numCustomers;
public CustomerManagementSystem(int maxCustomers) {
customers = new Customer[maxCustomers];
numCustomers = 0;
}
public void addCustomer(Customer customer) {
if (numCustomers < customers.length) {
customers[numCustomers] = customer;
numCustomers++;
} else {
System.out.println("Maximum number of customers reached.");
}
}
public void updateCustomer(String name) {
for (int i = 0; i < numCustomers; i++) {
if (customers[i].getName().equalsIgnoreCase(name)) {
// Prompt user to update customer information
// ...
return;
}
}
System.out.println("Customer not found.");
}
public void displayCustomers() {
for (int i = 0; i < numCustomers; i++) {
System.out.println("Name: " + customers[i].getName());
System.out.println("Age: " + customers[i].getAge());
System.out.println("Email: " + customers[i].getEmail());
System.out.println("--------------------------");
}
}
}
class Main {
public static void main(String[] args) {
CustomerManagementSystem cms = new CustomerManagementSystem(10);
// Add some customers
cms.addCustomer(new Customer("John Doe", 25, "john"));
cms.addCustomer(new Customer("Jane Smith", 30, "jane"));
// Update a customer
cms.updateCustomer("John Doe");
// Display all customers
cms.displayCustomers();
}
}
```
Please note that this is a simplified example, and you can enhance and customize it according to your specific needs. Also, make sure to write additional error handling and input validation as required.
Sure! Let's design a simple inventory management system for a small retail store. This application will allow the store to keep track of the products they have in stock, the quantity of each product, and their associated prices.
To accomplish this, we will create a Java console application that utilizes arrays, loops, inheritance, constructors, and information hiding.
Here's an outline of the solution:
1. Create a Product class:
- The Product class will serve as the base class for different types of products.
- It will have private attributes such as productID (int), name (String), quantity (int), and price (double).
- It will have getters and setters to access and modify the attributes.
- Implement a constructor to initialize the attributes.
2. Create specialized classes:
We can create specialized classes for different types of products, such as FoodProduct, ElectronicsProduct, ClothingProduct, etc. These classes will inherit from the Product class, allowing us to add specific attributes or methods for each type of product.
3. Create an Inventory class:
- The Inventory class will store an array of Product objects.
- It will have methods to add new products to the inventory, update the quantity and price of existing products, and generate a report of the inventory.
4. Implement the Inventory class methods:
- Create a method to add a new product to the inventory.
- Create a method to update the quantity and price of a product given its productID.
- Create a method to generate a report of the inventory using the console.
5. Write unit tests:
- Write unit tests using JUnit to test the functionality of the Inventory class's methods.
- Test the addProduct, updateProduct, and generateReport methods to ensure they produce the expected results.
By following this design, we can create a modular and scalable inventory management system that effectively manages different types of products.
Remember to write clean and maintainable code, and don't forget to thoroughly test your application to ensure it meets the desired requirements.