Question

In Java

Main method

Your main program will prompt the user for a test name and the number of scores the user will enter. After creating an arraylist to hold the scores, prompt the user for all the scores to hold in the arraylist. After all the scores are entered, then repeat back the score & letter grade.

GradeBook Object

Create an instance of a GradeBook object and pass the test name and arraylist to set the instance variables. At some point (inside a constructor or some other method), call a user-created method called setLetterGrades( ) that will set the letter grades that corresponds to the scores arraylist.

*There are multiple ways to set this up. You pick. Again, ultimate freedom. Get used to it.

Verify that the GradeBook object has getter and setter methods for all instance variables. Also, include a default no-argument constructor.

Use the chart below to figure out the appropriate letter grade.

Score (Greater than or equal to)	Letter Grade
90	A
80	B
70	C
60	D
Less than 60	F

Get the values back into the main program and print everything out.

Your output should look something like the example on page 2, with the user selecting different numbers for the scores array each time the program is ran or using a sentinel value loop.

Sample run

How many scores would you like to enter? 5

Enter a score: 46

Enter a score: 64

Enter a score: 72

Enter a score: 86

Enter a score: 94

Score -------- Grade

46 --------   F

64 --------   D

72 --------   C

86 --------   B

94 --------   A

Answer 1

The Java code for the above question is given below:

import java.util.*;
/**
 * GradeBook Class
 */
public class GradeBook {
    /**
     * Data members of the class
     * testName -- it denotes the name of the test
     * letterGrades  --- arraylist which denotes the letter grades of the score
     * scores -----  arraylist which denotes the scores
     */
    private String testName;
    private ArrayList<Character> letterGrades;
    private ArrayList<Integer> scores;

    /**
     * Default constructor  
     */
    GradeBook() {
        testName = "sample test";
    }

    /**
     * Parameterized constructor
     * parameters : name of the test and arraylist of scores
     */
    GradeBook(String name, ArrayList<Integer> arr) {
        testName = name;
        scores = arr;
        letterGrades = calculateLetterGrades(arr); // method to convert the score to letterGrades 
    }

    /**
     * Method to convert the scores to the letterGrades
     * It returns an arrayList of characters storing the lettergrades
     */
    public ArrayList<Character> calculateLetterGrades(ArrayList<Integer> arr) {
        ArrayList<Character> grade = new ArrayList<Character>(arr.size());
        for(int i=0;i<arr.size();i++) {
            if(arr.get(i) >= 90)
                grade.add('A');
            else if(arr.get(i) >= 80)
                grade.add('B');
            else if (arr.get(i) >= 70)
                grade.add('C');
            else if (arr.get(i) >= 60)
                grade.add('D');
            else
                grade.add('F');
        }
        return grade;
    }
    /**
     * Getters and Setters
     */
    public String getTestName() {
        return testName;
    }
    public void setTestName(String testName) {
        this.testName = testName;
    }
    public ArrayList<Character> getLetterGrades() {
        return letterGrades;
    }
    public void setLetterGrades(ArrayList<Character> letterGrades) {
        this.letterGrades = letterGrades;
    }
    public ArrayList<Integer> getScores() {
        return scores;
    }
    public void setScores(ArrayList<Integer> scores) {
        this.scores = scores;
    }

    /**
     * Main Method 
     */
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String testName;
        System.out.print("Enter Test Name : ");
        testName = scan.nextLine(); // input the test name
        int numberOfScores;
        System.out.print("How many scores would you like to enter? ");
        numberOfScores = scan.nextInt();  // input the number of scores
        ArrayList<Integer> arr = new ArrayList<Integer>(numberOfScores);
        for(int i=0;i<numberOfScores;i++) {
            System.out.print("Enter a Score: ");
            int score = scan.nextInt();  // input the scores
            arr.add(score);
        }
        GradeBook gradeBook = new GradeBook(testName, arr); // create an instance of GradeBook class
        ArrayList<Character> letterGrades = gradeBook.getLetterGrades(); // getting the letterGrades
        ArrayList<Integer> scores = gradeBook.getScores(); // getting the scores
        System.out.println("Score -------- Grade");
        for(int i=0;i<scores.size();i++) {
            System.out.println(scores.get(i) + " -------- " + letterGrades.get(i));
        }
    }
}

Sample Input and Output:

Screenshot of the code is given below:

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