URGENT Check this code for me please

Question

Dear whoeverthisreads, please read and see at the bottom my sourcecode, or whatever I could make of it until (even with help) I failed to see any solution. Please copy, paste and run to see if you can manage to adjust the program to make it work in the way as described. And I think I made it unnecessarily complicated. Whatever you can do for me, I will be very, very grateful.
Prem Pradeep, email: [email protected]
(A beginning dutch Java student who is running out of time and hope)
Catalogue Manager
Specification:
a) Develop an object to represent to encapsulate an item in a catalogue. Each CatalogueItem has three pieces of information: an alphanumeric catalogue code, a name, and a price (in dollars and cents), that excludes sales tax. The object should also be able to report the price, inclusive of a 15% sales tax, and the taxed component of the price.
b) Work out a way to be able to support the inc tax/ex tax price accessors, and the tax component accessor, without needing to store any additional information in the object.
c) Use an array of 5 CatalogueItem items to store data. (You may assume that no imported goods will be recorded.)
d) Write a driver program that prompts for three sets of user input (catalogue number, description and price), to be stored in the atalogueItem instance.
e) The data are to be read for each item in a single line. The data lines will be in the format:
CatNo:Description:Price
Use a StringTokenizer object to separate these data lines into their components.
f) Review the class definition of CatalogueItem, and use modifiers where appropriate to:
� Ensure that data is properly protected;
� Ensure that the accessors and mutators are most visible;
� The accessors and mutators for the catalogue number and description cannot be overridden.
� The constant for the tax rate is publicly accessible, and does not need an instance of the class
present in order to be accessible.
As well as a summary, the program should also calculate and display:
� All of the cheapest and most expensive item(s) in the catalogue. In the case of more than one
item being the cheapest (or most expensive), they should all be listed.
� A total of the pre-tax worth of the goods in the catalogue.
� The average amount of tax on the items in the catalogue.
A sample execution of the program may be as follows (output should be tabulated):
Enter five items of data:
AA123: Telephone: 52.00
ZJ282: Pine Table: 98.00
BA023: Headphones: 23.00
ZZ338: Wristwatch: 295.00
JW289: Tape Recorder: 23.00
LISTING OF ALL GOODS
Cat      Description      ExTax           Tax           IncTax ~
ZJ282      pine Table           98.00           14.70           112.70
AA123 Telephone           52.00           7.80           59.80
BA023 Headphones      23.00           3.45           26.45
ZZ338      Wristwatch      295.00      44.25      339.25
JW289 Tape Recorder      23.00           3.45           26.45
CHEAPEST GOODS IN CATALOGUE
Cat      Description      ExTax           Tax           IncTax
BA023 Headphones           23.00           3.45           26.45
JW289 Tape Recorder      23.00           3.45           26.45
MOST EXPENSIVE GOODS IN CATALOGUE
Cat      Description      ExTax           Tax           IncTax
ZZ338      Wristwatch      295.00      44.25      339.25
TOTAL PRE-TAX WORTH OF CATALOGUE ITEMS:      491.00
AVERAGE AMOUNT OF TAX PAYABLE PER ITEM:      14.73
The next code is what I could make of it�until I got terribly stuck...
//CatalogueItem.java
import java.io.*;
import java.text.DecimalFormat;
import java.util.StringTokenizer;
public class CatalogueItem {
private static final double TAXABLE_PERCENTAGE = 0.15;
private String catalogNumber;
private String description;
private double price;
/** Creates a new instance of CatalogueItem */
public CatalogueItem() {
catalogNumber = null;
description = null;
price = 0;
public CatalogueItem(String pCatalogNumber, String pDescription, double pPrice) {
catalogNumber = pCatalogNumber;
description = pDescription;
price = pPrice;
void setCatalogNumber(String pCatalogNumber) {
catalogNumber = pCatalogNumber;
String getCatalogNumber() {
String str = catalogNumber;
return str;
void setDescription(String pDescription) {
description = pDescription;
String getDescription() {
String str = description;
return str;
void setPrice(String pPrice) {
price = Double.parseDouble(pPrice);
double getPrice() {
double rprice = price;
return formatDouble(rprice);
double getTaxAmount(){
double rTaxAmount = price * TAXABLE_PERCENTAGE;
return formatDouble(rTaxAmount);
double getIncTaxAmount() {
double rTaxAmount = price * (1 + TAXABLE_PERCENTAGE);
return formatDouble(rTaxAmount);
double formatDouble(double value) {
DecimalFormat myFormatter = new DecimalFormat("###.##");
String str1 = myFormatter.format(value);
// System.out.println("String is " + str1);
// System.out.println("The format value : " + value);
return Double.parseDouble(str1);
public static void main(String[] args) throws IOException {
final int MAX_INPUT_SET = 5;
final String strQ = "Enter five items of data:";
CatalogueItem[] catalogList = new CatalogueItem[MAX_INPUT_SET];
String strInput;
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
String header = "Cat\tDescription\tExTax\tTax\tInc Tax";
String lines = "---\t-----------\t------\t---\t-------";
// Input of five items with three data each, delimiter ":"
for (int i = 0; i < MAX_INPUT_SET; i++) {
catalogList[i] = new CatalogueItem();
System.out.print(strQ);
strInput = stdin.readLine();
StringTokenizer tokenizer = new StringTokenizer(strInput, ":" );
String inCatNo = tokenizer.nextToken();
String inDescr = tokenizer.nextToken();
String inPrice = tokenizer.nextToken();
catalogList.setCatalogNumnber(inCatNo);
catalogList[i].setDescription(inDescr);
catalogList[i].setPrice(inPrice);
// Listing of all goods
System.out.println("LISTING OF ALL GOODS");
System.out.println(header);
System.out.println(lines);
for (int i = 0; i < MAX_INPUT_SET; i++) {
System.out.println(
catalogList[i].getCatalogNumber() + "\t" +
catalogList[i].getDescription() + "\t" +
catalogList[i].getPrice() + "\t" +
catalogList[i].getTaxAmount() + "\t" +
catalogList[i].getIncTaxAmount());
// This should pick the cheapest and most expensive goods in catalogue, but
// this code is not good:
// In the case of more than one item being the cheapest (or most expensive),
// they should all be listed.
double cheapest = cataloguelist[1].getPrice();
double mostExpensive = cataloguelist[1].getPrice();
          for(int i=2; i< MAX_INPUT_SET; i++){
               if (cataloguelist[i].getPrice < cheapest)
          cheapest = i;}
          for(int i=2; i< MAX_INPUT_SET; i++){
               if (cataloguelist[i].getPrice > mostExpensivet)
          mostExpensive = i;}
// Lists cheapest goods (not complete enough)
i = cheapest;
System.out.println("CHEAPEST GOODS IN CATALOGUE");
System.out.println(header);
System.out.println(lines);
System.out.println(
catalogList[i].getCatalogNumber() + "\t" +
catalogList[i].getDescription() + "\t" +
catalogList[i].getPrice() + "\t" +
catalogList[i].getTaxAmount() + "\t" +
catalogList[i].getIncTaxAmount());
// Lists most expensive goods (not complete enough)
i = mostExpensive;
System.out.println("MOST EXPENSIVE GOODS IN CATALOGUE");
System.out.println(header);
System.out.println(lines);
System.out.println(
catalogList[i].getCatalogNumber() + "\t" +
catalogList[i].getDescription() + "\t" +
catalogList[i].getPrice() + "\t" +
catalogList[i].getTaxAmount() + "\t" +
catalogList[i].getIncTaxAmount());}}
// Generates and shows total pre-tax worth of catalogue items (how??)
// generates and shows amount of tax payable per item (how??)

Answer 1

How is this:
import java.io.*;
import java.text.*;
import java.util.*;
public class Cat
     Vector items = new Vector();
public Cat()
public void read(String fname)
     FileReader     fr;
    BufferedReader br;
     String         str ="";
    try
         fr = new FileReader(fname);
        br = new BufferedReader(fr);
        while ((str = br.readLine()) != null && items.size() < 30)
               if (!str.trim().equals(""))
                    StringTokenizer tokenizer = new StringTokenizer(str, ":");
                 String n = tokenizer.nextToken().trim();
                    String d = tokenizer.nextToken().trim();
                    String s = tokenizer.nextToken().trim();
                    double p = Double.parseDouble(s);
                    items.add(new Item(n,d,p));
        fr.close();
    catch (FileNotFoundException e)
        System.out.println("Input file cannot be located, please make sure the file exists!");
        System.exit(0);
    catch (IOException e)
        System.out.println(e.getMessage());
        System.out.println("Application cannot read the data from the file!");
        System.exit(0);
public void displayAll()
     for (int j=0; j < items.size(); j++)
          Item item = (Item)items.get(j);
          System.out.println(item.toString());
public void sort()
     Collections.sort(items);     
public class Item implements Comparable
     String       number, description;
     double       price,pricep;
     final double TAXRATE = 0.15;
public Item(String number, String description, double price)
     this.number      = number;
     this.description = description;
     this.price       = price;
     this.pricep      = price * TAXRATE;
public int compareTo(Object o1)
     String o = ((Item)o1).number;
     return(number.compareTo(o));
public String toString()
     DecimalFormat df = new DecimalFormat("#.00");     
     String        p1 = df.format(TAXRATE*price);
     String        p2 = df.format(TAXRATE*price+price);
     String s = number+"\t "+description+"\t"+price+"\t"+p1+"\t"+p2+"\t" ;
     return(s);
public static void main (String[] args)
     Cat catalog = new Cat();
     catalog.read("C31.dat");
     String reply = "";
     BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
     while (!reply.equals("e"))
          System.out.println("");
        System.out.println("CATALOGUE MANAGER: MAIN MENU");
        System.out.println("============================");
        System.out.println("a) display all goods        b) display cheapest/dearest goods");
        System.out.println("c) sort the goods list      d) search the good list");
        System.out.println("e) quit");
        System.out.print("Option:");
          try
               reply = stdin.readLine();
          catch (IOException e)
            System.out.println("ERROR:" + e.getMessage());
            System.out.println("Application exits now");
            System.exit(0);
          if (reply.equals("a")) catalog.displayAll();
          if (reply.equals("c")) catalog.sort();
Noah