Can i add an if statement anywhere in this code?

Question

I need to add an if statement anywhere in this code, it doesnt matter where, but if it is nested it would be better. any ideas?
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import javax.swing.*;
import java.util.*;
import static java.lang.System.out;
import java.util.Scanner;
//Defines the counter for the student count and the lists for students
//to be saved in
public class EdronProject {
  private              int           studentCount;
  private static final String        USAGE = "Usage: java EdronProject <student count>";
  private              List<Student> list;
//Set up the counter fo the number of students and the list in which
//each student's information is saved once processed
  public EdronProject(int count) {
    studentCount = count;
    list = new ArrayList<Student>();
//Checks the number or arguments, and it executes the rest of the code
//if there is 1 argument or more (the number of arguments = the number
//of students being processed)
  public static void main( String args[] )  throws NumberFormatException {
   int count = 0;
   switch (args.length) {
     case 1: count = Integer.parseInt(args[0]); break;
     default: System.out.println(USAGE);
  //Defines method for processing and printing students within the
  //EdronProject class 
    EdronProject edp = new EdronProject(count);
    edp.processStudents();
    edp.printStudents();
  class Student {
  //Define integer values for the 5 subject's grades, the gradeCounter (used
  //in the processing stage) and the student name string
      private int 
                gradeCounter,
                grade1,
                grade2,
                grade3,
                grade4,
                grade5;
     private double total;
     private String studentName;
//Use setter getter methods for the student name to be retrieved
    public void setStudentName(String name) {
       studentName = name;
    public String getStudentName() {
      return( studentName );
//Use setter getter methods for the grades inputted to be retrieved
//by the processing stage
    public void setGrade(int gradeNo, int grade)  throws IllegalArgumentException {
      switch( gradeNo) {
        case 1 : grade1 = grade; break;
        case 2 : grade2 = grade; break;
        case 3 : grade3 = grade; break;
        case 4 : grade4 = grade; break;
        case 5 : grade5 = grade; break;
        default: throw new IllegalArgumentException("ERROR: Bad grade number passed!");
  //Increase grade counter for it to register the number of grades inputted
  //by user
      gradeCounter++;
    public int getGrade(int gradeNo)  throws IllegalArgumentException {
      int grade = 0;
      switch( gradeNo) {
        case 1 : grade = grade1; break;
        case 2 : grade = grade2; break;
        case 3 : grade = grade3; break;
        case 4 : grade = grade4; break;
        case 5 : grade = grade5; break;
        default: throw new IllegalArgumentException("ERROR: Bad grade number passed!");
  //Return grade values for them to be used by the processing stage   
      return( grade );
  //Calculate the total by adding al 5 grade values 
    public double getTotal() { 
      total = (getGrade(1) + getGrade(2) + getGrade(3) + getGrade(4) + getGrade(5));
  //Total value returned for it to be used to calculate the average   
      return total;
  //Average is calculated by dividing the total over the grade
  //counter (number of grades inputted)
    public double getAverage() { 
      return ( (gradeCounter == 0) ? 0 : total / gradeCounter);

Answer 1

//Get input from user for student's 5 grades which are set as Grade 1, 2, 3, 4, 5
  //and each five inputs for the student are saved to their own list along with the
  //student name
  public void processStudents() {
    for (int counter = 0; counter < studentCount; counter++) {
      Student student = new Student();
      student.setStudentName(JOptionPane.showInputDialog("Enter student's name:"));
      student.setGrade(1, Integer.parseInt(JOptionPane.showInputDialog( "Enter the student's grade for Psychology \n(You may ONLY use whole positive numbers ranging from 0 to 10)")));
      student.setGrade(2, Integer.parseInt(JOptionPane.showInputDialog( "Enter the student's grade for Math \n(You may ONLY use whole positive numbers ranging from 0 to 10)")));
      student.setGrade(3, Integer.parseInt(JOptionPane.showInputDialog( "Enter the student's grade for Art \n(You may ONLY use whole positive numbers ranging from 0 to 10)")));
      student.setGrade(4, Integer.parseInt(JOptionPane.showInputDialog( "Enter the student's grade for Science \n(You may ONLY use whole positive numbers ranging from 0 to 10) ")));
      student.setGrade(5, Integer.parseInt(JOptionPane.showInputDialog( "Enter the student's grade for English \n(You may ONLY use whole positive numbers ranging from 0 to 10)")));
      list.add(student);
//Begin printting stage for each student entered
  public void printStudents() {
    for ( int i = 0; i < list.size(); i++ ) {
      Student s = list.get(i);
      printStudent(s);
//Print the student name along with each grade entered separated by commas
//and the total and average values in separate lines
  private void printStudent(Student student) {
    System.out.println("Student Name: "+student.getStudentName()
                      +", Pych: "+student.getGrade(1)
                      +", Math: "+student.getGrade(2)
                      +", Art : "+student.getGrade(3)
                      +", Sci : "+student.getGrade(4)
                      +", Eng : "+student.getGrade(5)
                      +",\n Total  : "+student.getTotal()         
                      +",\n Average: "+student.getAverage()+"\n");