//////////////// This is class Test /////////////////////////////////////

import java.awt.*;
import javax.swing.*;
import java.io.*;

public class Test extends JFrame
{ 
    
    public JTextField dFields[];
    public JTextField aFields[];

    public Book book;

    private ObjectOutputStream objectOutputStream;
    private FileOutputStream fos1;
    
    
    private FileInputStream fis;
    private ObjectInputStream objectInputStream;
    
    private JPanel panel2;
    private JTextArea textArea;
    private JPanel p;
    private int size;
    
    
    
    public Test(int size)
    {
        dFields = new JTextField[size];
        aFields = new JTextField[size];
        
        setVisible(true);
        pack();
        p = new JPanel();
        p.setLayout(new FlowLayout());
        Container contentPane = getContentPane();
        
        
         for (int i = 0; i<size; i++) {             

            dFields[i] = new JTextField(5);
            p.add(dFields[i]);
            

            aFields[i] = new JTextField(5);
            p.add(aFields[i]);
            
            contentPane.add(p);
            
        }
        
        
        
        
        
        try {
            fos1 = new FileOutputStream(f);
            objectOutputStream = new ObjectOutputStream(fos1);
            
            fis = new FileInputStream(f);
            objectInputStream = new ObjectInputStream(fis);   
        }
         catch (IOException ioException) {
                JOptionPane.showMessageDialog(this, "Error with file.", "Error with file", JOptionPane.ERROR_MESSAGE);
                
            }

    } 
    File f = new File("test");
    
    public void read()
    {
   
        JFrame frame2 = new JFrame();
        panel2 = new JPanel();

        textArea = new JTextArea(30,30);
        p.add(textArea);

        getContentPane().add(p);
               

        p.setVisible(true);
    


        try {
                   for (int i = 0; i <= size; i++) {
                              String s = (String)objectInputStream.readObject();
                              textArea.append(s);
                   }                
            }
            catch (IOException ioException) {
                JOptionPane.showMessageDialog(this, "Error reading file", "Error reading file", JOptionPane.ERROR_MESSAGE);
            }
            catch (ClassNotFoundException classException) {
                JOptionPane.showMessageDialog(this, "Error ", "Error", JOptionPane.ERROR_MESSAGE);
            }
    }
    
    

    

    public void save()
    {
            try {
                for (int i = 0; i < size; i++) {
   
                    book = new Book(dFields[i].getText(), aFields[i].getText());

                    objectOutputStream.writeObject(book.toString());
                }
            }
            
        catch (IOException ioe) {
                JOptionPane.showMessageDialog(this, "Error saving file.", "Error saving file", JOptionPane.ERROR_MESSAGE);
                
            }
    }
    
}
///////////////////////////////////////////////////////////












//////////////// This is class Book /////////////////////


import java.io.Serializable;

public class Book implements Serializable
{
    public String description;
    public String amount;

    public Book(String description, String amount)
    {
        this.description = description;
        this.amount = amount;
    }
    
    public String getAmount()
    {
        return amount;
    }
    

    
    public String getDescription()
    {
        return description;
    }
    

    public String toString() {
        return description + " = " + amount;
    }
}
/////////////////////////////////////////////////////////////