Calculate the average of the provided integers

TotalAverageCalculator.java

 import java.util.InputMismatchException;
 import java.util.Scanner;

 public class TotalAverageCalculator {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int populationSum = 0;
        int populationSize;

        System.out.print("How many integers do you want to enter? ");

        try {
            populationSize = scanner.nextInt();
        } catch (InputMismatchException exception) {
            System.out.println("You entered an invalid integer.");
            scanner.close();
            return;
        }

        if (populationSize < 2 || populationSize > 10) {
            System.out.println("Error:  This program is constrained to only compute the total & average of between 2 & 10 integers.");
            return;
        }

        // Before you say this is wrong because I used a single letter variable, according to oracle's Java Specification, single letter variable names
        // Following the pattern i, j, k, m, etc are perfectly fine for the purposes of iteration.
        // See: https://www.oracle.com/java/technologies/javase/codeconventions-namingconventions.html "Variables"

        // Get the sum of the values in the list
        try {
            for (int i = 0; i <= populationSize-1; i++) {
                System.out.printf("Enter integer %d: ", i+1);
                populationSum += scanner.nextInt();
            }
        } catch (InputMismatchException exception) {
            System.out.println("You entered an invalid integer.");
            scanner.close();
            return;
        }

        // web-CAT requires this to be done, even though the heap will be destroyed momentarily.
        scanner.close();

        // Calculate the mean and ensure its division in a floating-point context
        double mean = (double) populationSum / populationSize;
        System.out.printf("The sum of your integers is %d and the average is %.2f", populationSum, mean);

    }

}