Hi Friend,

Exceptions always occurs at runtime. ArrayIndexOutOfBoundsException occurs when you try to access an item in an array which either doesn't exist or is outside the length of the array.

IF you want to check whether the entered number is armstrong or not then try the following code:

import java.io.*;
class Check{
public static void main(String[] args) throws Exception {
System.out.print("Enter number to check:");
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String input = reader.readLine();
int num=Integer.parseInt(input);
int i = num;
int number=0,remainder;
while(num > 0){
remainder = num % 10;
number = number + (int)Math.pow(remainder,3);
num = num / 10;
}
if(number == i){
System.out.println(i+" is an Armstrong Number");
}
else{
System.out.println(i+" is not a Armstrong Number");
}
}
}

Thanks