Create Custom Exception (Classes) using Java

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package main;

/**
 *
 * @author markjasongalang
 */
import java.util.Scanner;

class InvalidGradeException extends Exception {
    public String PrintErrorMessage() {
        return "Grade should be between 0 to 100 only.";
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        try {
            System.out.print("Enter grade: ");
            int grade = in.nextInt();
            if (grade < 0 || grade > 100) {
                throw new InvalidGradeException();
            }
            System.out.println("Grade: " + grade);
        } catch (InvalidGradeException e) {
            System.out.println(e.PrintErrorMessage());
        }
    }
}