MinMaxAvg.java

import java.util.Scanner;

public class MinMaxAvg {
    public static void main(String[] args) {
        int minNumra = 20, maxNumra = 180;
        Scanner input = new Scanner(System.in);

        int[] userNumbers = new int[20];

        System.out.println("Shkruani 20 numra:");

        int numra = 0;
        while (numra < 20) {
            System.out.print((numra+1) + ": ");
            userNumbers[numra] = input.nextInt();
            if (userNumbers[numra] >= minNumra && userNumbers[numra] <= maxNumra) {
                numra++;
            } else {
                System.err.println("Numri duhet te jete >= " + minNumra + " dhe <= " + maxNumra);
            }
        }

        double[] result = kalkulo(userNumbers);

        System.out.println("\n-----------------\nRezultatet\n");
        System.out.println("Min: " + result[0]);
        System.out.println("Max: " + result[1]);
        System.out.println("Avg: " + result[2]);

    }

    private static double[] kalkulo(int[] numbers) {
        int min = 19999, max = 0, sum = 0;

        for (int n : numbers) {
            if (n < min) min = n;
            if (n > max) max = n;
            sum += n;
        }

        double avg = sum / numbers.length;
        return new double[]{min, max, avg};
    }

}