Java Exception Handling

import java.util.Scanner;
class MyCalculator {
    long power(int n , int p) throws Exception
    {
        if(n==0 && p==0)
        throw new Exception("n and p should not be zero.");
        else if(n<0 || p<0)
        throw new Exception("n or p should not be negative.");
        else
        return (long)Math.pow(n,p);
    } 
}

public class Solution {
    public static final MyCalculator my_calculator = new MyCalculator();
    public static final Scanner in = new Scanner(System.in);
    
    public static void main(String[] args) {
        while (in .hasNextInt()) {
            int n = in .nextInt();
            int p = in .nextInt();
            
            try {
                System.out.println(my_calculator.power(n, p));
            } catch (Exception e) {
                System.out.println(e);
            }
        }
    }
}

Input (stdin):
3 5
2 4
0 0
-1 -2
-1 3

Output:
243
16
java.lang.Exception: n and p should not be zero.
java.lang.Exception: n or p should not be negative.
java.lang.Exception: n or p should not be negative.