1-public class InvalidGradeException extend Exception { }

2-we must use customclass for exception

3-for points method it must use throw

Objectives: In this lab, the following topic will be covered: 1. Exception Handling Task Write a method that returns quality points for a letter grade if it is valid and throws invalid exception otherwise. Write a test program that prompts the user to enter a letter grade and displays the quality points, as presented in the following sample run: Enter a letter grade: A The quality points 3.75 Enter a letter grade: C The quality points 2.0 Enter a letter grade: X Invalid grade