Creating a Custom Exception

import java.util.Scanner;
class MyException extends Exception{}
class InputTest{
        static Scanner sc = new Scanner(System.in);
        static public void main (String[] args){
                System.out.print("Enter your favorite number: ");
                try{
                        if(!sc.hasNextBigInteger() && !sc.hasNextBigDecimal()){
                                MyException e = new MyException();
                                throw e;
                        }
                        else    System.out.println("That's a cool number!");
                } catch(MyException e){
                        System.out.println("That's not really a number!");
                }
        }
}
//Output:-
//C:\Java>java InputTest
//Enter your favorite number: 3.1415926535897932384626433832795028841971693993751058209
//749445923078164062862089986280348253421170679
//That's a cool number!