ArmstrongNumbers in java

import java.util.*;

public class ArmstrongNum{
    public static boolean isArm(String num){
        int cifre = num.length(),
            sum   = 0;

        for(int i=0; i<cifre; i++)
            sum += Math.pow( num.charAt(i)-'0', cifre );
        if(sum == Integer.parseInt(num))
            return true;
        else return false;
    }
    public static boolean isArm(int num){
        return isArm(Integer.toString(num));
    }
    public static void main(String[] args) {
        String  num   = null;
        int     range = 0;
        Scanner in    = new Scanner(System.in);

        System.out.println("Inserire numero => ");
        num = in.next();

        if(!isArm(num))
            System.out.print("Non ");
        System.out.println("e` un numero di Armstrong");

        System.out.println("Inserire range => ");
        range = in.nextInt();

        for(int i=0, j=1; i<=range; i++)
            if( isArm(i) )
                System.out.println("Numero arm "+(j++)+" "+i);
    }
}