Array's methods and comands

I was trying to obtain the minimun value and its index between an array of int.

I can't understand why if I use the for-loop inside the main method it doesn't work, but if I use the same code in an aux method it works. The code should be right.

The part of the code that is commented is the for-loop that doesn't work.

package minimoArray;
import java.util.Scanner;

public class minimoArray {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Inserisci 10 numeri interi: "); 
        int [] Arr = new int [10];
        //int a = Arr[0];
        int b = 0;

        for (int i = 0; i < Arr.length; i++) {    //NON si può riempire l'array con for-each
            Arr[i] = scanner.nextInt();         
        }

        /*
        for (int i = 0; i < Arr.length; i++) {      
            if (Arr[i] < a) {
                a = Arr[i];
                b = i;
            }
        }*/

        int minimo = minimo(Arr);

        for (int i = 0; i < Arr.length; i++) {  
            if (Arr[i] == minimo) {
                b = i;
            }
        }

        System.out.println(" il minimo è: " + minimo); 
        System.out.println(" l'indice del minimo è: " + b); 
    }

    private static int minimo (int [] a) {
        var min = a[0];
        for (int i = 1; i < a.length; i++) {
            if (a[i] < min ) {
                min = a[i];
            }
        }
        return min;
    }  
}