oncampus

I have used a book class followed by a write class to write book information sequentially to a DAT file.

I want to read the book price data out of this dat file for an order form designed with an order class and a order write class.

I was wondering what is the best and easiest way of doing this?

Here is my book class which sets up a record of set size for each book

public class Book {
private int bookNumber;
private String productName;
private String categoryBook;
private String descriptionBook;
private String publisherBook;
private double priceBook;
// Read a record from the specified RandomAccessFile
public void read( RandomAccessFile file ) throws IOException
{
bookNumber = file.readInt();
char product[] = new char[ 15 ];
for ( int i = 0; i < product.length; i++ )
product[ i ] = file.readChar();
productName = new String( product );
char category[] = new char[ 15 ];
for ( int i = 0; i < category.length; i++ )
category[ i ] = file.readChar();
categoryBook = new String( category );
char description[] = new char[ 25 ];
for ( int i = 0; i < description.length; i++ )
description[ i ] = file.readChar();
descriptionBook = new String( description );
char publisher[] = new char[ 15 ];
for ( int i = 0; i < publisher.length; i++ )
publisher[ i ] = file.readChar();
publisherBook = new String( publisher );
priceBook = file.readDouble();
}
// Write a record to the specified RandomAccessFile
public void write( RandomAccessFile file ) throws IOException
{
StringBuffer buf;
file.writeInt( bookNumber );
if ( productName != null )
buf = new StringBuffer( productName );
else
buf = new StringBuffer( 15 );
buf.setLength( 15 );
file.writeChars( buf.toString() );
if ( categoryBook != null )
buf = new StringBuffer( categoryBook );
else
buf = new StringBuffer( 15 );
buf.setLength( 15 );
file.writeChars( buf.toString() );
if ( descriptionBook != null )
buf = new StringBuffer( descriptionBook );
else
buf = new StringBuffer( 15 );
buf.setLength( 15 );

file.writeChars( buf.toString() );
if ( publisherBook != null )
buf = new StringBuffer( publisherBook );
else
buf = new StringBuffer( 15 );
buf.setLength( 15 );
file.writeChars( buf.toString() );
file.writeDouble( priceBook );
}
public void setBookNumber( int b ) { bookNumber = b; }
public int getBook() { return bookNumber; }
public void setProductName( String n ) { productName = n; }
public String getProductName() { return productName; }
public void setCategoryBook( String c ) { categoryBook = c; }
public String getCategoryBook() { return categoryBook; }
public void setDescriptionBook( String d ) { descriptionBook = d; }
public String getDescriptionBook() { return descriptionBook; }
public void setPublisherBook( String u ) { publisherBook = u; }
public String getPublisherBook() { return publisherBook; }
public void setPriceBook( double p ) { priceBook = p; }
public double getPriceBook() { return priceBook; }
// This method contains a hard coded value for the
// size of a record of information.
public static int size() { return 132; }
}