public class Catalogue
{
    // CONSTANTS ***************************************************************
    
    final String CAT_FILE = "piclist.txt";
    final String TEMP_FILE = "temp.txt";
    
    final int[] PREMIUMS = {0, 3, 6, 10, 15,
                            25, 40, 60, 85, 120, 160};
                            
    final int SALE_MULTIPLE = 150;
    
    // INSTANCE VARIABLES ******************************************************

    // (none)
    
    // CONSTRUCTORS ************************************************************
    
    /**
     * Constructor
     */
    Catalogue ()
    {
        // no actions
    }

    // METHODS    
    
    void addPicture(int pCatNum, String pTitle, int pCategory)
    {
        try
        {
            FileWriter fw = new FileWriter(CAT_FILE, true);
            PrintWriter pw = new PrintWriter(fw);
        
            pw.println(pCatNum + "\t" + pTitle + "\t" + pCategory);
            fw.close();
        }
        
        catch (java.io.IOException ioe)
        {
            User.message("ERROR: unable to write to catalogue file");
            User.message("EXCEPTION: " + ioe);
        }
        
    }

import java.io.FileReader;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.File;

/*******************************************************************************
* Textfile-based gallery catalogue
*
*******************************************************************************/
public class Catalogue
{
    // CONSTANTS ***************************************************************
    
    final String CAT_FILE = "piclist.txt";
    final String TEMP_FILE = "temp.txt";
    
    final int[] PREMIUMS = {0, 3, 6, 10, 15,
                            25, 40, 60, 85, 120, 160};
                            
    final int SALE_MULTIPLE = 150;
    
    // INSTANCE VARIABLES ******************************************************

    // (none)
    
    // CONSTRUCTORS ************************************************************
    
    /**
     * Constructor
     */
    Catalogue ()
    {
        // no actions
    }

    // METHODS    
    
    void addPicture(int pCatNum, String pTitle, int pCategory)
    {
        try
        {
            FileWriter fw = new FileWriter(CAT_FILE, true);
            PrintWriter pw = new PrintWriter(fw);
        
            pw.println(pCatNum + "\t" + pTitle + "\t" + pCategory);
            fw.close();
        }
        
        catch (java.io.IOException ioe)
        {
            User.message("ERROR: unable to write to catalogue file");
            User.message("EXCEPTION: " + ioe);
        }
        
    }
    // *************************************************************************
    //
    // TO DO: write calcPremiums() method which prints a header saying
    //        "XXX Insurance Premiums" where XXX is the month, then reads each  
    //        record in the catalogue file and for each prints an advice of the
    //        form:
    //
    //        Insurance for Freda Bloggs
    //        Catalogue number: 42
    //        Insurance category: 6
    //        Monthly premium: £1400
    //
    //        and finally returns the total cost of the month's insurance
    // *************************************************************************

    
    /**
     * Remove picture from catalogue and calculate payment
     *
     * @param pCatNum catalogue number
     * @return payment due (or -1 if pNum not found in catalogue file)
     */
    public int sellPicture(int pCatNum)
    {
        String inputLine;
        String[] inputFields;
        int catNum;
        int category = -1;
        int payment;
        
        try
        {
            FileReader fr = new FileReader(CAT_FILE);
            BufferedReader br = new BufferedReader (fr);
            
            FileWriter fw = new FileWriter(TEMP_FILE, false);
            PrintWriter pw = new PrintWriter(fw);
            
            inputLine = br.readLine();
            while (inputLine != null)
            {
                inputFields = inputLine.split("\t");
                catNum = Integer.parseInt(inputFields[0]);

                if (catNum == pCatNum)
                {
                    category = Integer.parseInt(inputFields[2]);
                }
                else
                {
                    pw.println(inputLine);
                }
                inputLine = br.readLine();
            }
            
            fr.close();
            fw.close();
            
            if (category != -1)
            {
                File catFile = new File(CAT_FILE);
                File tempFile = new File(TEMP_FILE);
                catFile.delete();
                tempFile.renameTo(catFile);
                
                payment = PREMIUMS[category] * SALE_MULTIPLE;
            }
            else
            {
                payment = -1;
            }
            return payment;
            
        }
        catch (IOException ioe)
        {
            User.message("Unable to read/write from catalogue file");
            User.message("EXCEPTION: " + ioe);
            return -1;
        }
    }
    


}

System.err.println("Unable to read/write from catalogue file");
            System.err.println("EXCEPTION: " + ioe);