number thing

import java.util.Scanner;

public class NumberThing {
    //main method
    public static void main(String[] args) {
        int size, i;
        int[] numbers;
        boolean kill = false;
        String choice;
        Scanner input = new Scanner(System.in);

        System.out.print("Enter a size for the array: ");
        size = input.nextInt();
        numbers = new int[size];

        //random fill with numbers in range 0 - 99
        for (i = 0; i < size; i++) {
            numbers[i] = (int)(Math.random() * 100);
        }

        while (!kill) {
            System.out.print("\fEnter a letter to choose an operation:\n[S]um of array\n[A]verage of array\n[P]rint even indices\n[E]xit\nLetter? ");
            choice = input.next().toUpperCase();

            switch (choice) {
            case "A":
                System.out.printf("Average of array contents is %f\n", averageArray(numbers));
                break;
            case "E":
                kill = true;
                break;
            case "P":
                printEvenArray(numbers);
                break;
            case "S":
                System.out.printf("Sum of array contents is %d\n", sumArray(numbers));
                System.out.print("Hit enter to continue");
                break;
            }
        }
        input.close();
    }

    //take the sum of all numbers in an array
    public static int sumArray(int[] array) {
        int i, sum = 0;

        for (i = 0; i < array.length; i++) {
            sum += array[i];
        }

        return sum;
    }

    //return the average of all values in array
    public static double averageArray(int[] array) {
        return (double)sumArray(array) / (double)array.length;
    }

    //print even-indexed elements of array
    public static void printEvenArray(int[] array) {
        int i;
        for (i = 0; i < array.length; i += 2) {
            System.out.println(array[i]);
        }
    }
}