Throws vs throws

 package com.company;

class negativeRadiusException extends Exception{
    @Override
    public String toString() {
        return "Negative radius not allow";
    }
    @Override
    public String getMessage() {
        return "Area is not negative";
    }
}
public class CWH_84_throwVsThrow {
    public static double area(int r) throws negativeRadiusException{
        if(r<0){
            throw new negativeRadiusException();
        }
        double ar= Math.PI*r*r;
        return ar;
//        System.out.println(ar);
    }
    public static int divide(int a,int b) throws ArithmeticException{
        int c= a/b;
        return c;
    }
    public static void main(String[] args) {
       try {
//           double result = divide(54, 0);
//           System.out.println(result);
           double a= area(-9);
           System.out.println(a);
       }
       catch(Exception e){
           System.out.println("Exception");
           System.out.println(e.getMessage());
       }
    }
}