classes and arrays

I have created a invoice class that asks the user to enter different information about a part, I have also created a loop which goes through three times. the problems I am having are listed below i have been working at this for ages and just cant see what i need to do for it. the program and driver program are listed below also.

oCreate an object eg if num = 0 this will create an object in the first cell of the array:

inv [num] = new Invoice();

oUse the dialog boxes and setters to capture the data as before but include the invoice number ie 1 to 3 as shown below in the dialog box. eg

inv[num].setPartNumber(partNo);

昉rint the Invoice heading as before

昑hen use another For loop using the getter methods to display the values of each instance variable and the new method getInvoiceAmount to display the total of each line.

旳dd each line total and print the overall total.

?have the final dialog box show like below,

part description qty price total

nun01 nut 12 2 $24

bol01 bolt 12 3 $36

scw01 screw 24 1 $24

$84

/**

* This program demonstrates classes.

*

* @author (Simon Orazi)

* @version (11/05/07)

*/

publicclass Invoice

{

private String partNumber;

private String description;

privatedouble quantity;

privatedouble price;

public Invoice()

{

partNumber ="";

description ="";

quantity = 0;

price = 0;

}

/**

* The setPart method stores value in part field.

* @param partNumber the value to store in part.

*/

publicvoid setPartNumber(String piece)

{

partNumber = piece;

}

/**

* The setDescription method stores value in part field.

* @param desc the value to store in description.

*/

publicvoid setDescription(String desc)

{

description = desc;

}

/**

* The setQuantity method stores value in part field.

* @param quan the value to store in quantity.

*/

publicvoid setQuantity(double quan)

{

quantity = quan;

}

/**

* The setPrice method stores value in part field.

* @param amount the value to store in price.

*/

publicvoid setPrice(double amount)

{

price = amount;

}

/**

* The getPart method returns value.

* @return the value in the part field.

*/

public String getPartNumber()

{

return partNumber;

}

/**

* The getdescription method returns value.

* @return the value in the description field.

*/

public String getDescription()

{

return description;

}

/**

* The getQuantity method returns value.

* @return the value in the quantity field.

*/

publicdouble getQuantity()

{

return quantity;

}

/**

* The getPrice method returns value.

* @return the value in the price field.

*/

publicdouble getPrice()

{

return price;

}

publicdouble getTotal()

{

return quantity * price;

}

}

And now the Driver Program

import javax.swing.JOptionPane;

/**

* This program demonstrates classes.

*

* @author (Simon Orazi)

* @version (11/05/07)

*/

publicclass TestInvoice

{

publicstaticvoid main(String[] args)

{

String input;

double number;

double partTotal;

double invoiceTotal;

Invoice myInvoice =new Invoice();

for (int index = 0; index < 3; index++)

{

input = JOptionPane.showInputDialog("Please enter Part " + (index + 1) +" Number");

myInvoice.setPartNumber(input);

input = JOptionPane.showInputDialog("Please enter Part " + (index + 1) +" Description");

myInvoice.setDescription(input);

input = JOptionPane.showInputDialog("Please Enter Quantity of Part " + (index + 1) +" Required");

number = Double.parseDouble(input);

myInvoice.setQuantity(number);

input = JOptionPane.showInputDialog("Please enter Part " + (index + 1) +" Price");

number = Double.parseDouble(input);

myInvoice.setPrice(number);

partTotal = myInvoice.getQuantity() * myInvoice.getPrice();

}

invoiceTotal =

JOptionPane.showMessageDialog(null,"Part " +"" +"Description" +"" +"Qty" +"" +"Price\n" +

" $" + myInvoice.getPartNumber() +" $" + myInvoice.getDescription() +" $" +

myInvoice.getQuantity() +" $" + myInvoice.getPrice() +"\n" +"$" + partTotal);

}

}

[7764 byte] By [sorazia] at [2007-11-27 4:33:05]