Question

in java

1. Create a new project named, firstInitialLastNameCS185EOS.
2. Create and use a class that prints a title.  
3. Create a use a menu that contains the following items, and calls corresponding methods that do the tasks the menu describes. Use classes when they're appropriate. Keep the driver class as simple as possible. Give each class, method and property simple, descriptive names using Hungarian notation.
   1. Square a number
      1. Simply pass a decimal-type number to the object that does this task. Process its square and format the number so it has no more than 2 decimal places.
   2. Generate a random number
      1. Generate an 8 digit integer that could be used as a temporary password.  
   3. Months
      1. Enter a number from the keyboard, and return its corresponding month as a string to the console using arrays of months.
   4. Process objects
      1. Make an array of objects of the Vehicle class. Each time an object of the Vehicle class is created, keep track of the number of objects and print that number out when the summary is printed.
      2. Use polymorphism to store each vehicle in its own category; for example, create classes of Truck, Sedan, Roadster, Hatchback, and SUV that all inherit from the Vehicle class.
         1. In the Vehicle class, store the make, model and year
         2. In each of the other four classes, store a color. In the Truck class, store the fuel type, Gas or Diesel. In the Roadster class, store the engine type such as 4, 6, 8 or 12 cylinder. In the Sedan class, store the number of doors, 2 or 4.
         3. Print out a report to both the console and to a text file so it can be printed.
   5. Recursion
      1. Demonstrate recursion
4. When each menu item is selected using an integer 1 through 5, cause the execution of each corresponding object.

Answer 1

thanks for the question. The second part of the question where we need to create a class Vehicle is missing the class definition, hence it cannot be coded.

The first part is fully implemented. Below is the code with screenshot.

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import java.util.Random; # for generating random number
import java.util.Scanner; # for reading user input

public class Demo {

    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        System.out.println("Welcome to my class - Demo");
        while (true) { // infinte loop until user presses 4

            System.out.println("[1] Square a number");
            System.out.println("[2] Generate a random number");
            System.out.println("[3] Months");
            System.out.println("[4] Quit");
            System.out.print("Enter a choice ");
            int choice = scanner.nextInt();

            if (choice == 1) {
                squareIt(); // call this static method
            } else if (choice == 2) {
                generateRandomNumber();// call this static method

            } else if (choice == 3) {
                printMonths();// call this static method
            } else if (choice == 4) {
                System.out.println("Thank you for using my program.");
                break;// break out of the while loop
            }
        }
    }

    private static void squareIt() { // square number to 2 decimals
        double square = 0.0;
        System.out.print("Enter a number: ");
        square = scanner.nextDouble();
        System.out.printf("The square of the number is %.2f", square * square);
        System.out.println();
    }

    private static void generateRandomNumber() { / /generate 8 diigit number

        Random random = new Random();
        System.out.println("Here is the 8 digit number: " + (10000000 + random.nextInt(100000000)));

    }

    private static void printMonths() { // prints the month name

        String[] monthNames = {"January", "February", "March", "April", "May", "June", "July", "August", "September",
                "October", "November", "December"};
        System.out.print("Enter a month number [1-12]: ");
        int month = scanner.nextInt();
        if (1 <= month && month <= 12) {
            System.out.println("The month name is: " + monthNames[month - 1]);
        } else {
            System.out.println("Month number cannot be less than 1 or greater than 12.");
        }
    }
}

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import java.util.Random; Run: Demo "C:\Program FileslJavaljdk-11binljava.exe" "-javaagent:C:\Program Fi Welcome to my class Demo [1] Square a number [2] Generate a random number [3] Months 4] Quit Enter a choice 1 Enter a number3.678 i The square of the number is 13.53 [1] Square a number [2] Generate a random number [3] Months [4] Quit Enter a choice 2 Here is the 8 digit number: 36443740 [1] Square a number [2] Generate a random number [3] Months [4] Quit Enter a choice 3 Enter a month number [1-12] 12 The month name is: December [1] Square a number [2] Generate a random number [3] Months [4] Quit Enter a choice 4 Process finished with exit code 0 E 6: TODO Terminal : Messages 4: Run

thanks !