Chapter 12, Problem 9PE

Explanation of Solution

Program:

File name: “TestGrade.java”

//Import necessary header files

import java.util.*;

//Define a class named TestGrade

public class TestGrade

{

    //Define a main method

    public static void main(String args[]) throws Exception

    {

        //Create an object for Scanner class

        Scanner input = new Scanner(System.in);

        //Declare an array to store eight student ID numbers

        int[] ids = {1234, 1245, 1267, 1278, 2345,

                     1256, 3456, 3478, 4567, 5678

                    };

        //Declare test letter grades

        char[] grades = new char[10];

        String gradeString = new String();

        //Declare the variables and initialize the values

        final int HIGHLIMIT = 100;

        String inString, outString = "";

        int flag = 0;

        //For loop to be executed until x exceeds 8

        for (int x = 0; x < ids.length; ++x)

        {

//Prompt the user to enter a letter grade for the //student

System.out.println("Enter letter grade for student id number: " + ids[x]);

            inString = input.next();

            grades[x] = inString.charAt(0);

            //Try

            try

            {

                TestGrade.isValidGrade(grades[x]);

            }

            //Catch the GradeException

            catch(GradeException e)

            {

                //Print an appropriate message

                System.out.println(e);

                //Store I for student for whom

                //an exception is caught

                grades[x] = 'I';

            }

        }

        //For loop to be executed until x exceeds 8

        for (int x = 0; x < ids...