non-static variable calcGrade cannot be referenced from a static context

[blknmld69]

I am working on a major project. I keep getting the error non-static variable calcGrade cannot be referenced from a static context calcGrade.studentList[s] = new Student();

import java.util.*;  
   import java.io.*;
   import javax.swing.*; 
   import java.awt.*; 
   import java.awt.event.*; 
 
    public class GradeCalculator extends JFrame 
    { 
      private static final int WIDTH = 550; 
      private static final int HEIGHT = 430; 
 
      private static final int MAX_NUMBER_OF_STUDENTS = 20; 
 
                // instance variables 
      String Student[] = new String[MAX_NUMBER_OF_STUDENTS]; 
      private int noOfStudents; 
      private double score, tst1, tst2, tst3; 
      private double  classAvg, stAvg, totalScore; 
      private int displayedStudentIndex = 0; 
      private char ltrGrade; 
      private String stName; 
 
                // This area is for the GUI components 
                // Each item that will be displayed will 
                // have a label and a textfield, (L) and (TF),  
                // respectively. 
      private JLabel stNameL, tst1L, tst2L, tst3L, 
                                        classAvgL, stAvgL, headingL; 
      private JTextField stNameTF, tst1TF, tst2TF, tst3TF; 
      private JTextArea classAvgTA, stAvgTA; 
      private JButton exitB, nextB, prevB, calcGrade; 
 
      private ButtonHandler bHandler; 
 
       public GradeCalculator() 
       { 
         setTitle("Grade Calculator");           // set's the title 
         setSize(WIDTH, HEIGHT);                 // set the window size 
         Container pane = getContentPane();      // get the container 
         pane.setLayout(null);                   // set the container's layout to null 
 
         bHandler = new ButtonHandler();         // instantiate the button event handler 
 
                // instantiate the labels 
         headingL = new JLabel("STUDENT RECORD"); 
         stNameL = new JLabel("Studen Name", SwingConstants.RIGHT); 
         tst1L = new JLabel("Test 1", SwingConstants.LEFT); 
         tst2L = new JLabel("Test 2", SwingConstants.LEFT); 
         tst3L = new JLabel("Test 3", SwingConstants.LEFT); 
         stAvgL = new JLabel("Student Average     " 
                                                + "\n"   + "Class Average"); 
                //instantiate the text fields 
         stNameTF = new JTextField(65); 
         tst1TF = new JTextField(10); 
         tst2TF = new JTextField(10); 
         tst3TF = new JTextField(10); 
 
                // instantiate the text area 
         classAvgTA = new JTextArea(6, 20); 
         classAvgTA.setAutoscrolls(true); 
 
                // instantiate the buttons and register the listener 
         exitB = new JButton("Exit"); 
         exitB.addActionListener(bHandler); 
 
         nextB = new JButton("Next"); 
         nextB.addActionListener(bHandler); 
 
         prevB = new JButton("Previous"); 
         prevB.addActionListener(bHandler); 
 
         calcGrade = new JButton("Calc Grade"); 
         calcGrade.addActionListener(bHandler); 
 
                // set the size of the labels, text fields, and buttons 
 
         headingL.setSize(200, 30); 
         stNameL.setSize(100, 30); 
         stNameTF.setSize(100, 30); 
         tst1L.setSize(100, 30); 
         tst1TF.setSize(100, 30); 
         tst2L.setSize(120, 30); 
         tst2TF.setSize(100, 30); 
         tst3L.setSize(100, 30); 
         tst3TF.setSize(100, 30); 
         classAvgTA.setSize(370, 120); 
         calcGrade.setSize(100, 30); 
         prevB.setSize(100, 30);
         nextB.setSize(100, 30); 
         exitB.setSize(100, 30); 
 
                //set the location of the labels, text fields, 
                //and buttons 
         headingL.setLocation(220, 10); 
         stNameL.setLocation(20, 50); 
         stNameTF.setLocation(120, 50); 
         tst1L.setLocation(20, 100); 
         tst1TF.setLocation(120, 100); 
         tst2L.setLocation(300, 50); 
         tst2TF.setLocation(420, 50); 
         tst3L.setLocation(300, 100); 
         tst3TF.setLocation(420, 100); 
         classAvgTA.setLocation(70, 230); 
         prevB.setLocation(120, 370); 
         exitB.setLocation(220, 370); 
         nextB.setLocation(320, 370); 
         calcGrade.setLocation(420, 370); 
 
                //add the labels, text fields, and buttons to the pane 
         pane.add(headingL); 
         pane.add(stNameL); 
         pane.add(stNameTF); 
         pane.add(tst1L); 
         pane.add(tst1TF); 
         pane.add(tst2L); 
         pane.add(tst2TF); 
         pane.add(tst3L); 
         pane.add(classAvgTA); 
         pane.add(calcGrade); 
         pane.add(prevB); 
         pane.add(exitB); 
         pane.add(nextB); 
 
         setVisible(true);         //show the window 
         setDefaultCloseOperation(EXIT_ON_CLOSE); 
         System.exit(0); 
      } 
 
 
 
      public static void main (String [] args)
      { 
 
            File file = new File("AcademicGrades.txt");
            Scanner keyboard = new Scanner(System.in);
            Scanner inputFile = new Scanner(file); 
 
 
         for (int s = 0; s < MAX_NUMBER_OF_STUDENTS; s++) 
            {
            calcGrade.studentList[s] = new Student(); 
 
             gradeCalc.noOfStudents = 
                        inputFile.nextInt();       // get the number of students 
             gradeCalc.score = 
                        inputFile.nextDouble();    // get the student's scores 
 
               gradeCalc.getStudentData(inputFile); 
             gradeCalc.displayGradeAverage(0); 
         }
       }
                        // get the student data from file 
 
 
       public void getStudentData(Scanner inputFile) 
       { 
         System.out.println("Grade Calculator is getting information..."); 
         System.out.println("One Moment Please"); 
       } 
       private class ButtonHandler implements ActionListener 
       { 
          public void actionPerformed (ActionEvent e) 
          { 
            if (e.getActionCommand().equals("Previous")) 
               if (displayedStudentIndex > 0) 
                  displayGradeAverage(displayedStudentIndex - 1); 
               else 
                  displayGradeAverage(displayedStudentIndex); 
            else if (e.getActionCommand().equals("Next")) 
               if (displayedStudentIndex + 1 < noOfStudents) 
                  displayGradeAverage(displayedStudentIndex + 1); 
               else 
                  displayGradeAverage(displayedStudentIndex); 
            else if (e.getActionCommand().equals("Calc Grade")) 
               displayGradeAverage(0); 
            else 
               System.exit(0); 
         } 
       } 
 
       public void displayGradeAverage(int stName) 
       { 
             int studentList;
         displayedStudentIndex = stName; 
         String strName = ""; 
         boolean classAvg = studentList[(int) (totalScore / noOfStudents)].getClassAverage(); 
         stNameTF.setText(studentList[stName].getFirstName() + " " 
                                                            + studentList[stName].getLastName());
         stAvgTA.setText(""+studentList[(int) (totalScore / 5.0)].getStudentAverage());
         classAvgTA.setText(""+studentList[(int) (totalScore / noOfStudents)].getClassAverage()); 
       }
     }
 

[Oralloy]

The reason its giving you troubles is that your student loop is in the main method at line 131:

public static void main (String [] args)

Main, you will notice, is a static method, and thus is not associated with any specific object. Whereas the attribute calcGrade is an attribute of the GradeCalculator class.

The problem being that you never actually instantiate a GradeCalculator object in your code. You just start banging on object attributes in main without creating any object at all.

What I think you need to do is move all the code from main into getStudentData, and insert code in main to instantiate a GradeCalculator and run the awt event loop.

First, though, you have to get through your compilation problems. Work those out, then the rest should be easy.

If you're in doubt, comment out sections of code until you can display a minimal, working window, then re-enable code from there.

[Subin Ninan]

Static methods cannot access non-static variables. Static fields, methods are initialized before non-static fields.

[blknmld69]

No Im gettn this cannot find symbols:

   import javax.swing.*;         //needed for swing classes
   import java.awt.event.*;     // needed for the action listener
   import java.awt.*;            //needed for the boader layout class
   import java.io.*;             //need for the file and IOException
   import java.util.Scanner;    // needed for the scanner class
   import java.util.List;      // needed for the  arraylist
   import java.util.Arrays;      //needed for the arraylict class
 
    /**
        Constructor
    */
 
 
   public class project3 extends JFrame 
   {
 
      public gradeTypePanel gradeType; //to reference the the grade Type Panel with the radio buttons
      public namePanel name; // to reference the name panel with the name text field
      public testPanel test;// to reference the test panel with the 3 test grade fields
      public resultPanel result;// to reference the result panel with the result text field
      private JPanel panel; // to reference the a  panel
      private JButton calcButton; // creats the Button named calcButton
      private JButton prevButton; // creats the Button named prevButton
      private JButton nextButton; // creats the Button named nextButton
      private JButton saveButton; // creats the Button named saveButton
      private JPanel buttonPanel; // to  reference the panel where all the buttons go
      public openFile open;// to reference the open file class
      public int masterIndex = -1; // this controls all the of the indexes of all 4 arrays
 
       // constructs the window
      public project3()
      {
         // sets the title
         setTitle("Grade Program");
         // set what happens when the exit button is clicked
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         // sets the border layout
         setLayout(new BorderLayout());
         //calls the resultPanel class and names it result
         result = new resultPanel();
         //calls the gradeTypePanel and names it gradeType
         gradeType = new gradeTypePanel();
         //calls the namePanel and names it name
         name = new namePanel();
         //calls the testPanel and names it test
         test = new testPanel();
 
          //builds the button panel
         buildButtonPanel();
 
          //adds all of the panels to the north, south, east, west, and center panels
         add(name, BorderLayout.NORTH);  
         add(gradeType, BorderLayout.WEST);
         add(test, BorderLayout.CENTER);
         add(buttonPanel, BorderLayout.EAST);
         add(result, BorderLayout.SOUTH);
 
          // packs all the panels togather
         pack();
 
          //makes the window visable
         setVisible(true);
      }
 
      //builds the panel for the buttons
      private void buildButtonPanel()
      {
 
         buttonPanel = new JPanel();
 
 
         prevButton = new JButton("Prev");// adds the text prev to the prevButton
         calcButton = new JButton("Calc Grade");// adds the text Calc Grade to the calcButton
         nextButton = new JButton("Next");// adds the text Next to the nextButton 
         saveButton = new JButton("Save");// adds the text Save to the saveButton
 
 
         calcButton.addActionListener(new CalcButtonListener());// calls the  ActionListener for the calcButton
         prevButton.addActionListener(new PrevButtonListener());// calls the  ActionListener for the prevButto
         nextButton.addActionListener(new NextButtonListener());// calls the  ActionListener for the nextButton
         saveButton.addActionListener(new SaveButtonListener());// calls the  ActionListener for the addButton
 
 
         buttonPanel.add(prevButton);// adds the prevButton to the panel
         buttonPanel.add(saveButton);// adds the saveButton to the panel
         buttonPanel.add(nextButton);// adds the nextButton to the panel
         buttonPanel.add(calcButton);// adds the calcButton to the panel
 
 
      }
       //creats actionlistener for the Calc Grade button
      private class CalcButtonListener implements ActionListener
      {
          // executes when the button is clickd 
         public void actionPerformed(ActionEvent e)
         {
           //if masterIndex = -1 then you are not at index 0 of the arrays so you cant calculate
            if(masterIndex != -1)
            {
               String nameText;// to save the text in the name text field
               nameText = name.txtname.getText();//gets the text form name text field
               String grade1;// to save the text in the test1 text field
               grade1 = test.test1TextFild.getText();//gets the text form test1 text field
               String grade2;// to save the text in the test2 text field
               grade2 = test.test2TextFild.getText();//gets the text form test2 text field
               String grade3;// to save the text in the test3 text field
               grade3 = test.test3TextFild.getText();//gets the text form test3 text field
 
               //if the text in all 3 text field are  <= 100 calculate
               if(Double.parseDouble(grade1) <= 100 && Double.parseDouble(grade2) <= 100 && Double.parseDouble(grade3) <= 100)
               {
                  //convert and add all 3 grades together
                  double totalGrade = Double.parseDouble(grade1) + Double.parseDouble(grade2) + Double.parseDouble(grade3); 
                   //get the the avarage
                  double NumberGrade = (totalGrade / 300) * 100;
                   //to hold the letter grade
                  String letterGrade;
                  //if the alphabetical radio button is Selected get the letter grade
                  if(gradeType.alphabetical.isSelected())
 
                  {
 
 
                     if(NumberGrade >= 90)
                     {
                        //sets letter grade to A
                        letterGrade = "A";
                         //display the result in the result text field
                        result.textResult.setText(letterGrade);
 
                     }
                     else if(NumberGrade >= 80)
                     {
                        //sets letter grade to B
                        letterGrade = "B";
                         //display the result in the result text field
                        result.textResult.setText(letterGrade);
                     }
                     else if(NumberGrade >= 70)
                     {
                        //sets letter grade to C
                        letterGrade = "C";
                         //display the result in the result text field
                        result.textResult.setText(letterGrade);
                     }
                     else if(NumberGrade >= 60)
                     {
                        //sets letter grade to D
                        letterGrade = "D";
                         //display the result in the result text field
                        result.textResult.setText(letterGrade);
                     }
                     else if(NumberGrade < 60)
                     {
                        //sets letter grade to F
                        letterGrade = "F";
                         //display the result in the result text field
                        result.textResult.setText(letterGrade);
                     }
 
 
                  }
                   //if numerical is Selected get the number grade
                  if(gradeType.numerical.isSelected())
                  {
                     //display the result in the result text field
                     result.textResult.setText(Double.toString(NumberGrade));
                  }
               }
               else
               {
                  //displays error message when all grades are not <= 100
                  JOptionPane.showMessageDialog(null, "All Grades must be less than or equal to (100)");
               }
            }
            else
            {
                //shows error message when masterIndex == -1
               JOptionPane.showMessageDialog(null, "Please click (Next) first");
            }
 
         }                                        
      }
      //creats actionlistener for the Calc prev button
      private class PrevButtonListener implements ActionListener
      {
          // executes when the button is clickd gets the input and calcilates it
         public void actionPerformed(ActionEvent e)
         {
            //if masterIndex is > 0 
            if(masterIndex > 0)
            { 
               //decrament masterIndex by 1
               masterIndex--;
 
               String[] nameList;//to store the array
               String[] test1;//to store the array
               String[] test2;//to store the array
               String[] test3;//to store the array
 
 
               try 
               {
 
                  nameList = open.getArrayName();//get the nameList array from the class
                  test1 = open.getArrayTest1();//get the test1 array from the class
                  test2 = open.getArrayTest2();//get the test2 array from the class
                  test3 = open.getArrayTest3();//get the test3 array from the class
                  name.txtname.setText(nameList[masterIndex]);//populate the txtname text field with the array
                  test.test1TextFild.setText(test1[masterIndex]);//populate the test1 text field with the array
                  test.test2TextFild.setText(test2[masterIndex]);//populate the test2 text field with the array
                  test.test3TextFild.setText(test3[masterIndex]);//populate the test3 text field with the array
 
               } 
                  catch (IOException x)
                  { 
                     //displays an error message
                     System.out.println("Error");
                  } 
            }
 
            else
            {
               JOptionPane.showMessageDialog(null, "There are no previous students");
            }
 
         }                                
      }
      //creats actionlistener for the next button
      private class NextButtonListener implements ActionListener
      {
          // executes when the button is clickd 
         public void actionPerformed(ActionEvent e)
         {
            //incrament masterIndex by 1
            masterIndex++;
 
            String[] nameList;//to store the array
            String[] test1;//to store the array
            String[] test2;//to store the array
            String[] test3;//to store the array
 
 
            try 
            {
 
               nameList = open.getArrayName();//get the nameList array from the class
               test1 = open.getArrayTest1();//get the test1 array from the class
               test2 = open.getArrayTest2();//get the test2 array from the class
               test3 = open.getArrayTest3();//get the test3 array from the class
               name.txtname.setText(nameList[masterIndex]);//populate the txtname text field with the array
               test.test1TextFild.setText(test1[masterIndex]);//populate the test1 text field with the array
               test.test2TextFild.setText(test2[masterIndex]);//populate the test2 text field with the array
               test.test3TextFild.setText(test3[masterIndex]);//populate the test3 text field with the array
 
 
            } 
               catch (IOException x)
               { 
                   //displays an error message
                  System.out.println("Error");
               } 
         }
 
      }
      //creats actionlistener for the save button
      private class SaveButtonListener implements ActionListener
      {
          // executes when the button is clickd 
         public void actionPerformed(ActionEvent e)
         {
             //if masterIndex = -1 then you are not at index 0 of the arrays so you cant calculate
            if(masterIndex != -1)
            {
 
               try 
               {
 
                  String[] nameList;//to store the array
                  String[] test1;//to store the array
                  String[] test2;//to store the array
                  String[] test3;//to store the array
 
                  nameList = open.getArrayName();//get the nameList array from the class
                  test1 = open.getArrayTest1();//get the test1 array from the class
                  test2 = open.getArrayTest2();//get the test2 array from the class
                  test3 = open.getArrayTest3();//get the test3 array from the class
 
                  String saveName;// to save the text in the name text field
                  saveName = name.txtname.getText();//gets the text form name text field
                  String saveGrade1;// to save the text in the test1 text field
                  saveGrade1 = test.test1TextFild.getText();//gets the text form test1 text field
                  String saveGrade2;// to save the text in the test2 text field
                  saveGrade2 = test.test2TextFild.getText();//gets the text form test2 text field
                  String saveGrade3;// to save the text in the test3 text field
                  saveGrade3 = test.test3TextFild.getText();//gets the text form test3 text field
 
                  List<String> name1List = Arrays.asList(nameList); //treats the array as an arrayList 
                  List<String> test1List = Arrays.asList(test1);//treats the array as an arrayList
                  List<String> test2List = Arrays.asList(test2);//treats the array as an arrayList
                  List<String> test3List = Arrays.asList(test3);//treats the array as an arrayList
 
                  name1List.set(masterIndex, saveName);//changes of sets the value at the masterIndex to saveName
                  test1List.set(masterIndex, saveGrade1);//changes of sets the value at the masterIndex to saveGrade1
                  test2List.set(masterIndex, saveGrade2);//changes of sets the value at the masterIndex to saveGrade2
                  test3List.set(masterIndex, saveGrade3);//changes of sets the value at the masterIndex to saveGrade3
 
               //opens the file for writing
                  PrintWriter outputFile = new PrintWriter("name.txt");
               //writes the array to a text file
                  for(int index = 0; index < nameList.length; index++)
                  {
                     outputFile.println(nameList[index]);
                  }
               //closes the file    
                  outputFile.close();
 
               //opens the file for writing
                  PrintWriter outputFile1 = new PrintWriter("grade1.txt");
               //writes the array to a text file
                  for(int index1 = 0; index1 < test1.length; index1++)
                  {
                     outputFile1.println(test1[index1]);
                  }
               //closes the file
                  outputFile1.close();
 
               //opens the file for writing
                  PrintWriter outputFile2 = new PrintWriter("grade2.txt");
               //writes the array to a text file
                  for(int index2 = 0; index2 < test2.length; index2++)
                  {
                     outputFile2.println(test2[index2]);
                  }
               //closes the file
                  outputFile2.close();
 
               //opens the file for writing
                  PrintWriter outputFile3 = new PrintWriter("grade3.txt");
               //writes the array to a text file
                  for(int index3 = 0; index3 < test3.length; index3++)
                  {
                     outputFile3.println(test3[index3]);
                  }
               //closes the file
                  outputFile3.close();
 
 
               }  
                  catch (IOException x)
                  { 
                  //displays an error message
                     System.out.println("Error!");
                  }  
            }
            else
            {
                //shows error message when masterIndex == -1
               JOptionPane.showMessageDialog(null, "Please click (Next) first");
 
            }      
         }                                        
      }
 
      public static void main(String[] a)
      {
         // calls the project2 class
         new project2();
 
      }
   }
 

ERRORS
----jGRASP exec: javac -g project3.java

project3.java:17: cannot find symbol
symbol : class gradeTypePanel
location: class project3
public gradeTypePanel gradeType; //to reference the the grade Type Panel with the radio buttons
^
project3.java:18: cannot find symbol
symbol : class namePanel
location: class project3
public namePanel name; // to reference the name panel with the name text field
^
project3.java:19: cannot find symbol
symbol : class testPanel
location: class project3
public testPanel test;// to reference the test panel with the 3 test grade fields
^
project3.java:20: cannot find symbol
symbol : class resultPanel
location: class project3
public resultPanel result;// to reference the result panel with the result text field
^
project3.java:27: cannot find symbol
symbol : class openFile
location: class project3
public openFile open;// to reference the open file class
^
project3.java:40: cannot find symbol
symbol : class resultPanel
location: class project3
result = new resultPanel();
^
project3.java:42: cannot find symbol
symbol : class gradeTypePanel
location: class project3
gradeType = new gradeTypePanel();
^
project3.java:44: cannot find symbol
symbol : class namePanel
location: class project3
name = new namePanel();
^
project3.java:46: cannot find symbol
symbol : class testPanel
location: class project3
test = new testPanel();
^
project2.java:17: cannot find symbol
symbol : class gradeTypeLabel
location: class project2
public gradeTypeLabel gradeType; // to reference the the grade Type Label with the radio buttons
^
project2.java:18: cannot find symbol
symbol : class namePanel
location: class project2
public namePanel name; // to reference the name panel with the name text field
^
project2.java:19: cannot find symbol
symbol : class testPanel
location: class project2
public testPanel test; // to reference the test panel with the 3 test grade fields
^
project2.java:20: cannot find symbol
symbol : class resultPanel
location: class project2
public resultPanel result; // to reference the result panel with the result text field
^
project2.java:27: cannot find symbol
symbol : class openFile
location: class project2
public openFile open; // to reference the open file class
^
project2.java:40: cannot find symbol
symbol : class resultPanel
location: class project2
result = new resultPanel();
^
project2.java:42: cannot find symbol
symbol : class gradeTypeLabel
location: class project2
gradeType = new gradeTypeLabel();
^
project2.java:44: cannot find symbol
symbol : class namePanel
location: class project2
name = new namePanel();
^
project2.java:46: cannot find symbol
symbol : class testPanel
location: class project2
test = new testPanel();
^
project2.java:76: cannot find symbol
symbol : class CalcButtonListener
location: class project2
calcButton.addActionListener(new CalcButtonListener());// calls the ActionListener for the calcButton
^
project2.java:77: cannot find symbol
symbol : class PrevButtonListener
location: class project2
prevButton.addActionListener(new PrevButtonListener());// calls the ActionListener for the prevButto
^
project2.java:78: cannot find symbol
symbol : class NextButtonListener
location: class project2
nextButton.addActionListener(new NextButtonListener());// calls the ActionListener for the nextButton
^
project2.java:79: cannot find symbol
symbol : class SaveButtonListener
location: class project2
saveButton.addActionListener(new SaveButtonListener());// calls the ActionListener for the addButton
^
22 errors

[Oralloy]

Let's start with the first error.

Where is gradeTypePanel even defined? It looks like one of your classes, and I don't see it.

It's referenced in your code, but there's no import for it.

Also, in main(), you call out project2. I think it should be project3.

[blknmld69]

Good morning, Having all kinds of compilation errors with my program. Started a new one and here it is and the errors.

   import java.util.*; 
   import java.io.*; 
   import javax.swing.*; 
   import java.awt.*; 
   import java.awt.event.*; 
 
   public class SuperProject extends JFrame 
   { 
      private static final int WIDTH = 550; 
      private static final int HEIGHT = 430; 
      int gradeCalc; 
      int Student; 
      private StudentList[] sList = new StudentList[20]; 
      private static final int MAX_NUMBER_OF_STUDENTS = 20; 
 
   // instance variables 
      private int noOfStudents; 
      private double score, tst1, tst2, tst3; 
      private double classAvg, stAvg, totalScore; 
      private int displayedStudentIndex = 0; 
      private char ltrGrade; 
      private String stName; 
 
   // This area is for the GUI components 
   // Each item that will be displayed will 
   // have a label and a textfield, (L) and (TF), 
   // respectively. 
      private JLabel stNameL, tst1L, tst2L, tst3L, 
      classAvgL, stAvgL, headingL; 
      private JTextField stNameTF, tst1TF, tst2TF, tst3TF; 
      private JTextArea classAvgTA, stAvgTA; 
      private JButton exitB, nextB, prevB, calcGrade; 
      private ButtonHandler bHandler; 
 
      public SuperProject() 
      { 
         setTitle("Grade Calculator");       // set's the title 
         setSize(WIDTH, HEIGHT);               // set the window size 
         Container pane = getContentPane(); // get the container 
         pane.setLayout(null);                   // set the container's layout to null 
         bHandler = new ButtonHandler();    // instantiate the button event handler 
 
      // instantiate the labels 
         headingL = new JLabel("STUDENT RECORD"); 
         stNameL = new JLabel("Student Name", SwingConstants.RIGHT); 
         tst1L = new JLabel("Test 1", SwingConstants.LEFT); 
         tst2L = new JLabel("Test 2", SwingConstants.LEFT); 
         tst3L = new JLabel("Test 3", SwingConstants.LEFT); 
         stAvgL = new JLabel("Student Average " 
            + "\n" + "Class Average"); 
 
      //instantiate the text fields 
         stNameTF = new JTextField(65); 
         tst1TF = new JTextField(10); 
         tst2TF = new JTextField(10); 
         tst3TF = new JTextField(10); 
 
      // instantiate the text area 
         classAvgTA = new JTextArea(6, 20); 
         classAvgTA.setAutoscrolls(true); 
      // instantiate the buttons and register the listener 
         exitB = new JButton("Exit"); 
         exitB.addActionListener(bHandler); 
         nextB = new JButton("Next"); 
         nextB.addActionListener(bHandler); 
         prevB = new JButton("Previous"); 
         prevB.addActionListener(bHandler); 
         calcGrade = new JButton("Calc Grade"); 
         calcGrade.addActionListener(bHandler); 
      // set the size of the labels, text fields, and buttons 
         headingL.setSize(200, 30); 
         stNameL.setSize(100, 30); 
         stNameTF.setSize(100, 30); 
         tst1L.setSize(100, 30); 
         tst1TF.setSize(100, 30); 
         tst2L.setSize(120, 30); 
         tst2TF.setSize(100, 30); 
         tst3L.setSize(100, 30); 
         tst3TF.setSize(100, 30); 
         classAvgTA.setSize(370, 120); 
         calcGrade.setSize(100, 30); 
         prevB.setSize(100, 30); 
         nextB.setSize(100, 30); 
         exitB.setSize(100, 30); 
 
      //set the location of the labels, text fields, 
      //and buttons 
         headingL.setLocation(220, 10); 
         stNameL.setLocation(20, 50); 
         stNameTF.setLocation(120, 50); 
         tst1L.setLocation(20, 100); 
         tst1TF.setLocation(120, 100); 
         tst2L.setLocation(300, 50); 
         tst2TF.setLocation(420, 50); 
         tst3L.setLocation(300, 100); 
         tst3TF.setLocation(420, 100); 
         classAvgTA.setLocation(70, 230); 
         prevB.setLocation(120, 370); 
         exitB.setLocation(220, 370); 
         nextB.setLocation(320, 370); 
         calcGrade.setLocation(420, 370);
 
      //add the labels, text fields, and buttons to the pane 
         pane.add(headingL); 
         pane.add(stNameL); 
         pane.add(stNameTF); 
         pane.add(tst1L); 
         pane.add(tst1TF); 
         pane.add(tst2L); 
         pane.add(tst2TF); 
         pane.add(tst3L); 
         pane.add(classAvgTA); 
         pane.add(calcGrade); 
         pane.add(prevB); 
         pane.add(exitB); 
         pane.add(nextB); 
         setVisible(true); //show the window 
         setDefaultCloseOperation(EXIT_ON_CLOSE); 
         System.exit(0); 
      } 
 
         private class ButtonHandler implements ActionListener 
      { 
              public void actionPerformed (ActionEvent e)  
             {  
                if (e.getActionCommand().equals("Previous"))  
                   if (displayedStudentIndex > 0)  
                      displayGradeAverage(displayedStudentIndex - 1);  
                   else  
                      displayGradeAverage(displayedStudentIndex);  
                else if (e.getActionCommand().equals("Next"))  
                   if (displayedStudentIndex + 1 < noOfStudents)  
                      displayGradeAverage(displayedStudentIndex + 1);  
                   else  
                      displayGradeAverage(displayedStudentIndex);  
                else if (e.getActionCommand().equals("Calc Grade"))  
                   displayGradeAverage(0);  
                else  
                   System.exit(0);  
             }  
 
      public static void main (String [] args) 
      { 
         new SuperProject(); 
      } 
 
      Scanner inFile = 
      new Scanner(new FileReader("AcademicGrades.txt")); 
      { 
         for (int s = 0; s < MAX_NUMBER_OF_STUDENTS; s++) 
            gradeCalc.StudentList[s] = new Student(); 
         gradeCalc.noOfStudents = 
            inFile.nextInt();     // get the number of students 
         gradeCalc.score = 
            inFile.nextDouble(); // get the student's scores 
         gradeCalc.getStudentData(inFile); 
         gradeCalc.displayGradeAverage(0); 
      } 
 
   // get the student data from file 
      public void getStudentData(Scanner inFile) 
      { 
         System.out.println("Grade Calculator is getting information..."); 
         System.out.println("One Moment Please"); 
      } 
 
 
           public void displayGradeAverage(int stName)  
          {  
             displayedStudentIndex = stName;  
             String strName = "";  
             boolean classAvg = studentList[(int) (totalScore / noOfStudents)].getClassAverage();  
             stNameTF.setText(StudentList[stName].getFirstName() + " "  
                                                                + studentList[stName].getLastName()); 
             stAvgTA.setText(""+StudentList[(int) (totalScore / 3.0)].getStudentAverage()); 
             classAvgTA.setText(""+StudentList[(int) (totalScore / noOfStudents)].getClassAverage()); } 
           } 
        }
 

Then it goes to StudentList.java and gives the following:
ERRORS
----jGRASP exec: javac -g SuperProject.java

StudentList.java:5: class GradeCalculator3 is public, should be declared in a file named GradeCalculator3.java
public class GradeCalculator3 extends JFrame
^
SuperProject.java:13: cannot access StudentList
bad class file: .\StudentList.java
file does not contain class StudentList
Please remove or make sure it appears in the correct subdirectory of the classpath.
private StudentList[] sList = new StudentList[20];
^

----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

[Oralloy]

Sorry, just got in.

First, the error "StudentList.java:5..." is about your "StudentList.java" class failing to compile. Since its failing compile, the error at line 13 just continues the problem.

So. First thing you need to do is clean up StudentList.java. It looks like the main class there is actually declared as "GradeCalculator3". You need to fix that, and any other errors that might result.

[blknmld69]

I will try that Orally but I had to turn the project in this morning! I really do want to get it working. I appreciate all your help and I definitely will be back to the site when my Last class start in Oct.

Once again Thank!

[Oralloy]

@blknmld69,

No worries! Good luck with your schooling.