Programming Language: JAVA

Need Help Trying To Calculate Student's GPA. I have pasted the three classes I have so far down below. (Student,Classes,Grade)

Assignment: Generate a student report card that lists all classes, grades, and the grade point average for a semester.

Student.java

importjava.util.*;

public class Student {

private String firstName;

private String lastName;

private String IDnum;

private String gender;

private String gradeLevel;

public Student() {

firstName = " ";

lastName = " ";

IDnum = " ";

gender = " ";

gradeLevel = " ";

}

public Student(String ln, String fn, String ID, String gender, String gradeLevel) {

lastName = ln;

firstName = fn;

IDnum = ID;

this.gender = gender;

this.gradeLevel = gradeLevel;

}

/**gets the last name

* @return last name

*/

public String getln() {

returnlastName;

}

/**gets first name

* @return first name

*/

public String getfn() {

returnfirstName;

}

/**returns Student ID

* @return Student ID

*/

public String ID() {

return IDnum;

}

/**returns gender

* @return gender

*/

public String gender() {

return gender;

}

public String getGradeLevel(){

returngradeLevel;

}

public void setln(String ln) {

lastName=ln;

}

public void setfn(String fn) {

firstName=fn;

}

public void setID(String ID) {

IDnum=ID;

}

public void setGender(String gender) {

this.gender = gender;

}

public void setGradeLevel(String gradeLevel) {

this.gradeLevel = gradeLevel;

}

public double gradePointAverage() {

return 0;

}

/** it returns string of the different student details */

public String toString() {

return " Name: "+firstName + " " + lastName+" ID: "+IDnum +" Gender: "+gender +" Grade Level: "+ gradeLevel;

}

}

Classes.java

importjava.util.*;

public class Classes extends Student {

private String courseNumber;

private String courseName;

protected static String gradeLetter;

private String units;

public Classes() {

courseNumber = " ";

courseName = " ";

gradeLetter = " ";

units = " ";

}

public Classes(String cNumber, String cName, String gLetter, String units) {

courseNumber = cNumber;

courseName = cName;

gradeLetter = gLetter;

this.units = units;

}

/**Gets the Course Number

* @return course number

*/

public String getcourseNumber() {

returncourseNumber;

}

/**Gets Course Name

* @return course name

*/

public String getcourseName() {

returncourseName;

}

/**returns Grade Letter

* @return grade letter

*/

public String gradeLetter() {

returngradeLetter;

}

/**Gets Grade Letter

* @return grade letter

*/

public String getGradeLetter(){

returngradeLetter;

}

/**sets Last name with a new value

* @param ln Last name

*/

public void setcourseNumber(String courseNumber) {

this.courseNumber=courseNumber;

}

/**sets first name with a new value

* @param fn First name

*/

public void setcourseName(String courseName) {

this.courseName=courseName;

}

/**sets Id with a new value

* @param ID Employee ID

*/

public void setGradeLetter(String gradeLetter) {

this.gradeLetter=gradeLetter;

}

public void setUnits(String units) {

this.units = units;

}

/** it returns string of the different student details */

public String toString() {

return " Course Number: "+ "\tCourse Name: "+"\tUnits: " +"\tGrade: " + " " + courseNumber+"\t\t" +courseName+"\t\t" +units+"\t"+gradeLetter;

}

}

Grades.java

public class Grades extends Classes {

//static double gradePointAverage=0;

static Student student[]=new Student[1];

staticClasses classes[]=new Classes[4];

/** Main method which throws CloneNotSupportedException

* @param args

* @throws CloneNotSupportedException

*/

public static void main(String [] args)throws CloneNotSupportedException {

student[0]= new Student("Wilson", "Alison", "2420213", "F", "Senior");

classes[0]= new Classes("123", "Math", "A", "4");

classes[1]= new Classes("456", "English", "A", "3");

classes[2]= new Classes("789", "History", "A", "3");

classes[3]= new Classes("011", "Science", "A", "3");

for(inti=0;i<1;i++) {

System.out.println(student[i]);

}

for(int j=0;j<4;j++) {

System.out.println(classes[j]);

}

}

public double gradePointAverage() {

for(inti=6;i<9;) {

gradeLetter+=classes[j].gradePointAverage();

//String gra = " ";

double total = 0.0;

doubledecValue = 0.0;

if (gradeLetter.equals("A")) {

decValue = 4;

total += decValue;

} else if (gradeLetter.equals("B")) {

decValue = 3;

total += decValue;

} else if (gradeLetter.equals("C")) {

decValue = 2;

total += decValue;

} else if (gradeLetter.equals("D")) {

decValue = 1;

total += decValue;

} else if (gradeLetter.equals("F")) {

decValue = 0;

total += decValue;

System.out.println("GPA:"+ total);

}

returndecValue;

}

returngradeLetter;

}

}