Good afternoon, tell me please, what is wrong with the code? In Eclipse, I have everything working. Maybe I misunderstood condition. I wrote so that the program first asks how many numbers will be introduced, and then takes them.
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import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.*;
public class zadacha {

    public static void main(String[] args) {
        System.out.println("Сколько чисел вы хотите ввести?");
        Scanner scan = new Scanner(System.in);
        int temp = scan.nextInt();
        int arr[] = new int[temp];

        for (int i=0; i < temp; ++i){
            System.out.println("Введите число номер " +(i+1));
            arr[i] = scan.nextInt();
        }
        scan.close();
        DecimalFormatSymbols s = new DecimalFormatSymbols();
        s.setDecimalSeparator('.');
        DecimalFormat f = new DecimalFormat("#,##0.0000", s);
        for (int j = temp-1; j >= 0; j--){
            double z = Math.sqrt(arr[j]);
            System.out.println(f.format(z));
        }
    }
}

Remove all outputs which are not connected with the task.