public class Student

$\{$

private static final int NUM$\_$EXAMS $=4$;

private String firstName;

private String lastName;

private int gradeLevel;

private double gpa;

private int$[]$ exams;

private int numExamsTaken;

$//$ Constructor

public Student$($String fName, String lName, int grade$)$

$\{$

firstName $=$ fName;

lastName $=$ lName;

gradeLevel $=$ grade;

exams $=$ new int$[$NUM$\_$EXAMS$]$;

numExamsTaken $=0$;

$\}$

$//$ Implement this method!

$//$ Returns the sum of the differences between exams

$//$ Example: Assume exams $=\{54,67,89,95\}$

$//$ Improvement $=(67-54)+(89-67)+(95-89)=41$

public int getExamImprovement$()$

$\{$

$//$ your code goes here!

$\}$

public String getName$()$

$\{$

return firstName $+""+$ lastName;

$\}$

public void addExamScore$($int score$)$

$\{$

exams$[$numExamsTaken$]=$ score;

numExamsTaken$++$;

$\}$

$//$ This is a setter method to set the GPA for the Student.

public void setGPA$($double theGPA$)$

$\{$

gpa $=$ theGPA;

$\}$

$/**$

$*$ This is a toString for the Student class. It returns a String

$*$ representation of the object, which includes the fields

$*$ in that object.

$*/$

public String toString$()$

$\{$

return firstName $+""+$ lastName $+"$ is in grade: $"+$ gradeLevel;

$\}$

$\}$