Gradebook program (15 points) (StudentData .java) Write the definition of the cl

Question

Gradebook program (15 points)

(StudentData.java) Write the definition of the class StudentData such that an object of this class can store a student

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.javaimport 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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