Question

Using jGRASP, write a Java program named LastnameFirstname11.java, using your last name and your first name, that does the following:

• Defines a method called generateNums. This method will create an array of size x, fill it with random numbers between y and z, then return the array. When you call the method, you must specify the size of the array (x), the beginning of your random number range (y), and the ending of your random number range (z).
• Defines a method called avgNums. You will be able to pass a double array to this method. This method will add up all the numbers in the array. Then it will divide that sum by the size of the array to find the average of all the numbers. Return the average.
• Asks the user for input to determine the array size and what range of random numbers to generate.
• Calls the generateNums method 5 times to create arrays based on the user's input.
  • Store each of the returned arrays into a variable.
• Calls the avgNums method 5 times.
  • Store each of the returned arrays into a variable.
• Prints the results, displaying 4 digits after the decimal.

Answer 1

I have created a class whose name is LastnameFirstname11 and If you want to change the name of the main class to your lastname and firstname, you can do if it is important

The code to generate the random elements in the array and to find the average of the elements of the array is as follow:

import java.util.Random;
import java.util.Scanner;
import java.util.Arrays;

class LastnameFirstname11 {
        private static Random random = new Random();

        // Generate a double array with given size, minimun and maximum value
        public static double[] generateNums(int x, int min, int max) {
                double[] array = new double[x];
                for(int i = 0; i< x; i++) {
                        array[i] = (Math.random() * (max - min + 1) + min);
                }
                return array;
        }

        // Generate the average of the elements in the given array
        public static double avgNums(double[] array) {
                double sum = 0;
                for(int i =0; i<array.length; i++) {
                        sum += array[i];
                }

                return sum/array.length;
        }

        // main method which handle the execution of the above functions
        public static void main(String args[]) {
                Scanner scan = new Scanner(System.in);
                double[] averageValues = new double[5];
                double[][] doubleArrays = new double[5][];
                int size, min, max; 
                System.out.println("Enter the information for 5 times \n");

                for(int i =0; i<5; i++ ) {
                        System.out.println("Enter the size of array " + (i + 1));
                        size = scan.nextInt();
                        System.out.println("Enter the Minimum value of array " + (i + 1));
                        min = scan.nextInt();
                        System.out.println("Enter the Maximum value of array " + (i + 1));
                        max = scan.nextInt();
                        doubleArrays[i] = generateNums(size, min, max);
                        averageValues[i] = avgNums(doubleArrays[i]);
                }

                for(int i =0; i < doubleArrays.length; i++) {
                        System.out.println("\nElements of array " + (i + 1));

                        for(int j = 0; j < doubleArrays[i].length; j++) {
                                System.out.printf("%.4f    ", doubleArrays[i][j]);
                        }
                        
                        System.out.printf("\nThe Average value of the above Array is %.4f", averageValues[i], "\n");
                        System.out.println("\n---------------------------------------------------\n");
                }
        }
}

I am even attaching the output images

If you have any doubts you can add a comment in the comments section. Thank you