armstrong java

// program to check if a given number is an Armstrong number or not

import java.util.Scanner;
import java.util.ArrayList;

class armstrong{

    int number,upper,lower;
    Scanner sc = new Scanner(System.in);

    public void getData(){
        System.out.print("Enter the number : ");
        this.number = sc.nextInt();
    }

    public void getRange(){
        System.out.print("Enter the upper limit : ");
        this.upper = sc.nextInt();
        System.out.print("Enter the lower limit : ");
        this.lower = sc.nextInt();
    }

    boolean armstrong(){
        ArrayList<Integer> myNum = new ArrayList<Integer>();
        int num = this.number;
        int temp = 0;
        int sum = 0;
        while(num != 0){
            temp = num%10;
            num = num/10;
            myNum.add(temp);
        }

        for(int i : myNum){
            sum = sum + i*i*i;
        }

        if(sum == this.number){
            return true;
        }
        else{
            return false;
        }

    }

    void check(){
        for(int i=this.lower; i<=this.upper;i++){
            this.number = i;
            boolean isArmstrong = armstrong();
            if(isArmstrong){
                System.out.println(i);
            }
        }
    }

}

public class armstrongChecker{
    public static void main(String arg[]){
        Scanner s = new Scanner(System.in);
        boolean cont = true;
        int choice = 0;
        while(cont){
            System.out.println("The following choices are availiable : ");
            System.out.println("1.Check if a number is an Armstrong number or not");
            System.out.println("2.Print all armstrong numbers in a given range");
            System.out.print("Enter your choice : ");
            choice = s.nextInt();

            while(choice > 2 || choice < 0){
                System.out.println("Wrong input!");
                System.out.print("Enter your choice : ");
                choice = s.nextInt();
            }

            if(choice == 1){
                armstrong a1 = new armstrong();
                a1.getData();
                boolean isArmstrong = a1.armstrong();
                if(isArmstrong){
                    System.out.println("The entered number is an Armstrong Number.");
                }
                else{
                    System.out.println("The entered number is not an Armstrong Number.");
                }
            }
            else if(choice == 2){
                armstrong a1 = new armstrong();
                a1.getRange();
                a1.check();
            }
            System.out.print("Do you want to continue (1/0): ");
            int n = s.nextInt();
            if(n == 0){
                cont = false;
            }
        }
    }
}