3. Gradebook Program a. (StudentData.java) Write the definition of the class Stu

Question

3. Gradebook Program a. (StudentData.java) Write the definition of the class StudentData such that an object of this class can store a student’s id, first name, last name, midterm score, final score, and homework score. - Include 6 private data members: id, firstName, lastName, midtermScore, finalScaore, and hwScore. - Add constructors, getters and setters. - Add a method that calculates and returns the average score. o The method signature should be • public double calculateAverageScore() o Average score = midtermScore * 30% + finalScore * 40% + hwScore * 30% - Add a method that determines and returns the grade. o The method signature should be • public char calculateGrade() o A – the average score is 90 and above; o B – the average score is 80 to 89; o C – the average score is 70 to 79; o D – the average score is 60 to 69; o F – the average is 59 and below. - Override the toString method so that it returns student data as a string. b. (GradeBook.java) Write a menu-driven client program that can help the instructor to manage the grade book. The program should repeatedly execute until the user choose not to. - Use an array of objects of the class StudentData to store each student’s data. - Read the data file “student_data.txt” to populate the array of objects (the data file is on D2L). - Use a menu to do the following. 1: Output students’ information. 2: Output the class average. 3: Find the student with the highest score and display his/her information. 4: Find the students with the final grade A and display his/her information. 0: End the program.

Explanation / Answer

import java.io.*; import java.util.*; public class StudentData{ private int id; private String firstName; private String lastName; private double averageScore; public StudentData() //default constructor { } public StudentData(int id, String firstName, String lastName, double averageScore) { this.id = id; this.firstName = firstName; this.lastName = lastName; this.averageScore = averageScore; } public void setId( int id ) { this.id = id; } public int getId() { return id; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getFirstName() { return firstName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getLastName() { return lastName; } public void setAverageScore(double averageScore) { this.averageScore = averageScore; } public double getAverageScore() { return averageScore; } public char calculateGrade() { char grade; if(this.averageScore >=90){ grade = 'A'; } else if(this.averageScore >=80){ grade = 'B'; } else if(this.averageScore >= 70){ grade = 'C'; } else if(this.averageScore >= 60){ grade = 'D'; } else{ grade = 'F'; } return grade; } public String toString() { return "id = " + id + "," + "name = " + name + "," + "avarege score = " + averageScore + "," + "grade is" + calculateGrade(); } } //GradeBook.java import java.io.*; import java.util.*; public class GradeBook //client program { public static void main(String[] args) throws FileNotFoundException { //create an array of 10 elements of type StudentData??? StudentData[] students = new Student[10]; //create and associate the Scanner object to the input file??? Scanner sc = new Scanner("student_data.txt"); //create ten StudentData object to populate the array ??? //read data from the file and set each object properly ??? StringTokenizer st = null; for(int i=0; i

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