Challenge involving creating a file on GUI & seeing one record at a time...

Question

Hi,
If anyone can help me with this project I'd be most appreciative. I'll try and explain the problem the best I can. I'm adding students to a database at a university they're either a Graduate or an Undergraduate. I'm taking in first, lastname's, ssn, & ACT/SAT/GMAT test results. I have a GUI called StudentRecord that has all the JTextFields, JButton's, etc. I'm also writing it to a .txt file called StudentDA. For this I used a BufferedFile reader.
What I really need is on my StudentRecord when I click the display button I want it to show one record at a time in another JFrame. This other JFrame I named it display. I'm trying to create an instance of JFrame inside of the actionPerformed for StudentRecord but when I click display nothing happens.
I adding the students with a vector that I'm calling v. I want the Display to read from the .txt file and display one at a time hence next, and previous. I'm going to post the tidbit of relevant code. If anyone can help me you'd be my hero for the day for all time I've tried to get this to work.
Here's the StudentRecord (GUI) display part:
      public void actionPerformed( ActionEvent event )
     try {
          Display d = new Display(StudentDA.v);
         }//end try
        //catch right here no problems with this..Here's the DataAccess part:
public class StudentDA{
  static Vector v = new Vector();;
  static String pathName = "a:/Final Project/test1.txt";
  static File studentFile = new File(pathName);
  static String status;
  public StudentDA() {}
  public static void initialize() {
    if (studentFile.exists() && studentFile.length() !=0) {
     try{
      BufferedReader in = new BufferedReader(new
      FileReader(studentFile) );
      do{
         status = in.readLine();
          if(status.equals ("uGrad")) {
            uGrad u = new uGrad();
            u.setFName(in.readLine() );
            u.setLName(in.readLine() );
            u.setssNum(Integer.parseInt(in.readLine()) );
            u.setACT(Integer.parseInt(in.readLine() ));
            v.add(u);
            System.out.println(u + "inside ugrad");
          }//end if uGrad
          else{
            if(status.equals("Grad")) {
            //same process as uGrad
            v.add(g);
          }//end else Grad
      }while (status != null);
    }//end try statement
    catch (Exception e) {
      }//end catch
    }//end if there's something there
  }//end method initialize
  //creating the terminate method
  public static void terminate() {
    try{
      PrintStream out = new PrintStream ( new
      FileOutputStream (studentFile) );
      for (int i = 0; i < v.size(); i++) {
        Student s = (Student) v.elementAt(i);
        String p = s.printRecord();
        StringTokenizer rt = new StringTokenizer(p, "\t");
        while (rt.hasMoreTokens() ) {
          out.println(rt.nextToken() );
          }//end while
      }//end for loop
    }//end try loop
    catch (Exception e){
    }//end catch
  }//end terminate
public static void add(Student s){// throws DuplicateException{
          boolean duplicate = false;
          for(int i = 0; i < v.size(); i++){
               if(s.getssNum() == ((Student)(v.elementAt(i))).getssNum()){
                    duplicate = true;
                    break;
               if(duplicate){
                    throw new DuplicateException("Student Already Exists");
               else{
                    v.add(s);
}//end add method
}//end classHere's the display class:
public class Display extends JFrame {
     private JButton Next, Previous;
     private JTextField statusField, firstField, lastField, socialField, advPlacementField, actField;
     private JLabel statusLabel, firstLabel, lastLabel, socialLabel, advPlacementLabel, actLabel;
     private JPanel fieldPanel, buttonsPanel;
     private JTextArea displayArea;
     static int count = 0;
     static String status;
     public Display(){}
public Display(Vector v){
     //setting up the GUI components for the display class here
     //JTextAreas & JLabels
     buttonsPanel = new JPanel();
     buttonsPanel.setLayout(new GridLayout(1,2));
    Next = new JButton("Next");
    buttonsPanel.add(Next);
    Next.addActionListener(
    new ActionListener() {
      public void actionPerformed( ActionEvent event )
          //try to catch display errors
       try {
                    count++;
                 displayData(count);
                 //displayData();
      }//end try
          catch {
         }//end catch
      } // end actionPerformed
    } // end anonymous inner class
    ); // end call to addActionListener
    buttonsPanel.add(Next);
    Previous = new JButton("Previous");
    buttonsPanel.add(Previous);
    Previous.addActionListener(
    new ActionListener() {
      public void actionPerformed( ActionEvent event )
          //try to catch display errors
          try {
               count--;
               displayData(count);
               //displayData();
         }//end try
          catch {
         }//end catch
      } // end actionPerformed
    } // end anonymous inner class
    ); // end call to addActionListener
}//end display() constructor
public void displayData(int count) {
     StudentDA.initialize();
       if (status.equals ("uGrad")) {
       //these are all part of the StudentRecord GUI not Display GUI
            fieldPanel.setVisible(true);
            buttonsPanel.setVisible(true);
            actLabel.setVisible(true);
            actField.setVisible(true);
            advPlacementLabel.setVisible(false);
            advPlacementLabel.setVisible(false);
       }//end if
       else {
            if(status.equals ("Grad")) {
             fieldPanel.setVisible(true);
             buttonsPanel.setVisible(true);
             actLabel.setVisible(false);
             actField.setVisible(false);
             advPlacementLabel.setVisible(true);
             advPlacementLabel.setVisible(true);
              }//end if
       }//end else
}//end method displayData()
public static void main ( String args[] )
    Display application = new Display();
    application.addWindowListener(
          new WindowAdapter(){
               public void windowClosing( WindowEvent e)
                    System.exit(0);
    application.setSize( 300, 200);
    application.setVisible( true );
};//end main
}//end class Display{}I know this is long but if anyone can help I'd greatly appreciate it. Please ask me if you need me to clarify something, I tried to not make it way too long. --rockbottom01
     

Answer 1

I'm not really too sure what it is that you are after, but here is some code, that loads up an array with each line of a .txt file, then displays them. I hope you can make use of a least some of it.
just ask if you don't understand any of the code.
String array[];
int i;
public Test() {
          readFile("file.txt");
          i = 0;
          nextEntry();
     public void nextEntry() {
          Display display = new Display();
          display.show();
     class Display extends JFrame implements ActionListener {
          JLabel label1;
          JButton button;
          public Display() {
               label1 = new JLabel(array);
               button = new JButton("OK");
               getContentPane().setLayout(new FlowLayout());
               getContentPane().add(label1);
               getContentPane().add(button);
               button.addActionListener(this);
          public void actionPerformed(ActionEvent e) {
               setVisible(false);
               i++;
               if(i < array.length) {
                    nextEntry();
     public void readFile(String fileName) {
          String s, s2 = "";
          int lineCount = 0;
          BufferedReader in;
          try {
               in = new BufferedReader(new FileReader(fileName));
               while((s = in.readLine()) != null) {
                    lineCount++;
               array = new String[lineCount];
               in.close();
               in = new BufferedReader(new FileReader(fileName));
               int j = 0;
               while((s = in.readLine()) != null) {
                    array[j] = s;
                    j++;
          catch(IOException e) {
               System.out.println("Error");