I need heed help for Handle the JButton

Question

hi, guys
I am writing a small program
It has name and number field.
It also has the first, privious, next , last and add buttons.
i want to load the myData.txt file to the name and number field.
and I want to make the buttons handle the events.
and when the application is closed, it will save the data into the files.
I can assign the the add button to save the files, and save the data when it is closed, but I can not make it save more than one record.
i need ur help to the rest of the buttons, and load the file back to the field.
andy suggestion would be great!
Thank !
here codes
   import javax.swing.*;
   import java.awt.event.*;
   import java.awt.*;
   import javax.swing.event.*;
   import java.io.*;
    public  class buttonAction extends JFrame
      private JLabel nameL;
      private JLabel numberL;               
      private JTextField name;
      private JTextField number;
      private JButton first;
      private JButton prev;
      private JTextField current;
      private JButton next;
      private JButton last;
      private JButton add;
      private JButton exit;
      private final int winw = 410;
      private final int winh = 200;
       private buttonAction()
         super("Wage Calculate");
         setSize(winw, winh);
         setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
         addWindowListener(new Closing());
         setLayout (new BorderLayout());
         loadData();        
         buildPanel();
         buildButtomButtons();
         setVisible(true);
       private void buildPanel()
         nameL = new JLabel("Name:");
         numberL = new JLabel("Number:");
         name = new JTextField(10);
         number = new  JTextField(5);
         JPanel panel =new JPanel();
         panel.setLayout(new GridLayout(2,1));
         panel.add(nameL);
         panel.add(name);
         panel.add(numberL);
         panel.add(number);
         add(panel, BorderLayout.NORTH);
       private void buildButtomButtons()
         first = new JButton("First");
         prev = new JButton("Prev");
         current = new JTextField(5);
         current.setEditable(false);
         next = new JButton("Next");
         last = new JButton("Last");
         add = new JButton("Add");
         exit = new JButton("Exit");
         JPanel button = new JPanel();
         first.addActionListener(new ButtonListener());
         prev.addActionListener(new ButtonListener());
         current.addActionListener(new ButtonListener());
         next.addActionListener(new ButtonListener());
         last.addActionListener(new ButtonListener());
         add.addActionListener(new ButtonListener());
         button.add(first);
         button.add(prev);
         button.add(current);
         button.add(next);
         button.add(last);
         button.add(add);
         add(button, BorderLayout.SOUTH);
        // save the data into the file when the application is close
       public class Closing extends WindowAdapter
          public void windowClosing(WindowEvent e)  
            try {
               PrintWriter out = new PrintWriter (new FileWriter("myData.txt"));
               out.println (name.getText());
               out.println(number.getText());
               out.close();
                catch (IOException ee) {
               // Happens if the file cannot be written to for any reason
                  JOptionPane.showMessageDialog(null, "Could not save the file " + ee.getMessage());
            System.exit(0);
       private void loadData()
         try {
            BufferedReader fileReader = new BufferedReader(new FileReader(new File("myData.txt")));
            String lineRead = fileReader.readLine();
              // I need help how to load the data
             catch (FileNotFoundException e)
               e.printStackTrace();
             catch (IOException e) {
               e.printStackTrace();
        //handle the first, previous, next, last, add buttons
       private class ButtonListener implements ActionListener
          public void actionPerformed(ActionEvent e)
            Object button = e.getSource();
            if (button == add)
               try
                  PrintWriter out = new PrintWriter (new FileWriter("myData.txt"));
                  out.println (name.getText());
                  out.println(number.getText());
                  out.close();
                   catch (IOException ee)
                  // Happens if the file cannot be written to for any reason
                     JOptionPane.showMessageDialog(null, "Could not save the file " + ee.getMessage());
                    //I need help for the first, privious and last buttons
       public static void main(String[] args)
         buttonAction pr = new buttonAction();
   }

Answer 1

are you trying to load a multi line textfile int a JTextField? If you try to load this in a while loop as you read the file, it will zoom through the file, and you will probably only see the last line of the file (or nothing if the last line is blank) in the jtextfield. Consider using a JTextArea or some other component that can hold multiple lines. Also your file reading method calls look wrong to me. You appear to read a line, then continually check if that one read line is null, and if not do a while loop, that looks to loop forever. Look at the java I/O examples for how to do this right.
Good luck