In need of serious JFrame/Stringbuffer Help!

Question

Basicly, it opens a GUI with a few buttons like "previous, last, first, next, add, exit"
and i take 3 inputs from the user...from the JTextField. Those values are put in a file and are supposed to be read (i'm assuming that i use stringtokenizer) but right now i'm using stringbuffer to write to a file. I can't get it to write to the next line though.. it writes next to it..
I'm just hoping that i'm using the correct functions to do this job. Feedback greatly appreciated, i'm really worried about the stringbuffer and having it write the way it should. I didn't do the reading yet.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
public class BookMaintenance extends JFrame
     private JTextField author;
     private JTextField title;
     private JTextField publisher;
     private JButton add;
     private JButton exit;
     private JButton first;
     private JButton previous;
     private JButton next;
     private JButton last;
     private Container container;
          public BookMaintenance()
               author = new JTextField(10);
               title = new JTextField(10);
               publisher = new JTextField(10);
               add = new JButton("Add");
               exit = new JButton("Exit");
               first = new JButton("First");
               previous = new JButton("Prev");
               next = new JButton("Next");
               last = new JButton("Last");
               last.setSize(30,10);
               JPanel jPanel1 = new JPanel();
               jPanel1.add(new JLabel("Title: "));
               jPanel1.add(title);
               JPanel jPanel2 = new JPanel();
               jPanel2.add(new JLabel("Author: "));
               jPanel2.add(author);
               JPanel jPanel3 = new JPanel();
               jPanel3.add(new JLabel("Publisher: "));
               jPanel3.add(publisher);
               JPanel jPanel4 = new JPanel();
               jPanel4.add(first);
               jPanel4.add(next);
               jPanel4.add(previous);
               jPanel4.add(last);
               JPanel jPanel5 = new JPanel();
               jPanel5.add(add);
               jPanel5.add(exit);
               container = this.getContentPane();
               GridLayout gLayout = new GridLayout(5,1);
               container.setLayout(gLayout);
               container.add(jPanel1);
               container.add(jPanel2);
               container.add(jPanel3);
               container.add(jPanel4);
               container.add(jPanel5);     
               ActionListener actionListener = new ButtonListener();
               first.addActionListener(actionListener);
               next.addActionListener(actionListener);
               previous.addActionListener(actionListener);
               last.addActionListener(actionListener);
               add.addActionListener(actionListener);
               exit.addActionListener(actionListener);
class ButtonListener implements ActionListener
         public void actionPerformed(ActionEvent event)
             if(event.getSource() == add)
                         StringBuffer stringBuffer = new StringBuffer();
                         stringBuffer.append(title.getText());
                         stringBuffer.append(" ");
                         stringBuffer.append(author.getText());
                         stringBuffer.append(" ");
                         stringBuffer.append(publisher.getText());
                         stringBuffer.append(" ' ");
                         RandomAccessFile randomAccessFile = null;
                                try
                                randomAccessFile = new RandomAccessFile("file.txt","rw");
                                        System.out.println(stringBuffer.toString());
                                randomAccessFile.seek(randomAccessFile.length()); 
                                randomAccessFile.writeBytes(stringBuffer.toString() );
                                randomAccessFile.close();
                                        catch(IOException ioe){}
          public static void main(String args[])
        BookMaintenance frame = new BookMaintenance();
        frame.setTitle("Book Maintenance");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 250);
        frame.setVisible(true);
      //  frame.setResizable(false);
}

Answer 1

I have, I've tried many different ways.. but it's hard because with your example, you added it by itself.. and i don't know how to change it to take the input from the user instead of what you gave it.
Lookin at your code.. how would i replace this with input from the user? like add the title, author, publisher in there?
          items = new ArrayList<InventoryItem>();
          items.add(new InventoryItem("Java Programming", "A book about java programming."));
          items.add(new InventoryItem("Monkey Soup", "A delicious Dinner Meal."));
          items.add(new InventoryItem("Red", "My Favorite Color"));
          items.add(new InventoryItem("Light Bulb", "An incandescent miracle."));
          items.add(new InventoryItem("Caleb Payne", "Your god."));
          items.add(new InventoryItem("You", "Caleb's bitch."));Message was edited by:
DenisK