jahnaviJavaException

import java.util.Scanner;

public class Jahnavi20BCE0413 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner ReadInput = new Scanner(System.in);
        System.out.println("Input Registration number:");
        String reg = ReadInput.nextLine();
        try {
            if (reg.equals("20BCE0413")) {
                throw new RegNumException();
            }
            System.out.println("Valid Registration number");
        }
        catch(RegNumException e) {
            System.out.println("Invalid Registration number");
        }
        ReadInput.close();
    }
}

class RegNumException extends Exception{

}