Compare Numbers

import java.util.Arrays;

public class CompareNumbers {
    public static void firstAndLast(int[] arr) {
        System.out.println("First number is " + arr[0]);
        System.out.println("Last number is " +arr[arr.length-1]);
        System.out.println();
    }
    public static void allElements(int[] arr) {
        for(int i = 0; i < arr.length; i++) {
            System.out.printf("%d number " + arr[i], i+1);
            System.out.println();
        }
        System.out.println();
    }
    public static int sumElements(int[] arr) {
        int sum = 0;
        for(int i = 0; i < arr.length; i++) {
            sum += arr[i];
        }
        System.out.println("Sum is " + sum);
        System.out.println();
        return sum;
    }
    public static void biggestNum(int[] arr) {
        int max = 0;
        for(int i = 0; i < arr.length; i++) {
            if(arr[i] > max) {
                max = arr[i];
            }
        }
        System.out.println("Max is " + max);
        System.out.println();
    }
    public static void average(int[] arr, int sum) {
        int average = sum/arr.length;
        System.out.println("Average is " + average);
        System.out.println();
    }

    public static void main(String[] args) {
        int[] chisla = {1,2,3,4,5,6,7};
        firstAndLast(chisla);
        allElements(chisla);
        int totalSum = sumElements(chisla);
        biggestNum(chisla);
        average(chisla, totalSum);
    }
}