Hey to everyone out there. I am new to this forum and seeking assistance with a java program assignment. if anyone can help let me know. The program is completed all I have left is to produce accurate output of a students grade. Here is the code:

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import javax.swing.JOptionPane;
class Student {
final double ASSIGNMENT_ONE_PERCENTAGE = .10;
final double ASSIGNMENT_TWO_PERCENTAGE = .10;
final double ASSIGNMENT_THREE_PERCENTAGE = .10;
final double ASSIGNMENT_FOUR_PERCENTAGE = .10;
final double MIDTERM_PERCENTAGE = .25;
final double FINALEXAM_PERCENTAGE = .25;
final double PARTICIPATION_PERCENTAGE = .10;

String name, finalLetterGrade;
int assignmentOne = 0;
int assignmentTwo = 0;
int assignmentThree = 0;
int assignmentFour = 0;
int midterm = 0;
int finalExamGrade = 0;
int participation = 0;
double finalNumericGrade = 0;


public Student() {
System.out.println (" Initializing Student...");

}

public void inputGrades() {
name=JOptionPane.showInputDialog("Enter Student's full Name:");
assignmentOne = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Assignment One Grade" ));
assignmentTwo = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Assignment Two Grade" ));
assignmentThree = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Assignment Three Grade" ));
assignmentFour = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Assignment Four Grade" ));
midterm = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Midterm Grade" ));
finalExamGrade = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Final Examination Grade" ));
participation = Integer.parseInt(JOptionPane.showInputDialog( "Enter the Participation Grade" ));
}

public double getAverage(){
finalNumericGrade =
(assignmentOne * ASSIGNMENT_ONE_PERCENTAGE) +
(assignmentTwo * ASSIGNMENT_TWO_PERCENTAGE) +
(assignmentThree * ASSIGNMENT_THREE_PERCENTAGE) +
(assignmentFour * ASSIGNMENT_FOUR_PERCENTAGE) +
(midterm * MIDTERM_PERCENTAGE) +
(finalExamGrade * FINALEXAM_PERCENTAGE) +
(participation * PARTICIPATION_PERCENTAGE);
return finalNumericGrade;
}

private String letterGrade(){
if (finalNumericGrade >= 93)
finalLetterGrade = "A";
else
if ((finalNumericGrade >= 85) & (finalNumericGrade < 93))
finalLetterGrade = "B";
else
if ((finalNumericGrade >= 78) & (finalNumericGrade < 85))
finalLetterGrade = "C";
else
if ((finalNumericGrade >= 70) & (finalNumericGrade < 78))
finalLetterGrade = "D";
else
if (finalNumericGrade < 70)
finalLetterGrade = "F";

return finalLetterGrade;



}


public String toString() {
String studentStringValue= " Student Name is: "+name +"\n";
studentStringValue+= " Assignment One grade is: " + assignmentOne + "\n";
studentStringValue+=" Assignment Two grade is: " + assignmentTwo + "\n";
studentStringValue+=" Assignment Three grade is: " + assignmentThree + "\n";
studentStringValue+=" Assignment Four grade is: " + assignmentFour + "\n";
studentStringValue+=" Midterm grade is: " + midterm + "\n";
studentStringValue+=" Final Exam is: " + finalExamGrade + "\n";
studentStringValue+=" Participation grade is: " + participation + "\n\n";
studentStringValue+=" Final Numeric Grade is: " + finalNumericGrade + "\n";
studentStringValue+=" Final Letter Grade is: " + finalLetterGrade +"\n";

return studentStringValue;
}


public void printName(){
System.out.print(" "+name);
}

}

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I can not get the letter grade to reflect in the output. ANy ideas?