parallel array and applets

[Gina Ruffolo-Daniel]

Newbie: I am trying to create an applet that allows a user to enter the number of guest and display the per person price or total cost (number of guest * price). The user should be allowed to change the number of guest without exiting the application. I know that it is a loop. Please see the code below

 import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JPartyPlanner extends JApplet implements ActionListener
{
final int NUM_RANGE = 7;
int[] guestCount = {1,25,50,100,200,500,1000};
int[] price = {27,25,22,19,17,14,11};
int guestPrice;
int sub = NUM_RANGE - 1;
Container con = getContentPane();
Font headlineFont = new Font("Lucida Console", Font.BOLD,16);
Font question = new Font("Lucida Console",Font.TRUETYPE_FONT,10);
JLabel companyName = new JLabel("Event Handlers INC.");
JLabel numOfGuest = new JLabel("Please enter the number of Guest:");
JTextField answer = new JTextField(10);
JButton perGuest = new JButton("Per Person Fee");
JButton eventCost = new JButton("Event Fee");
JLabel eventMsg = new JLabel(" ");
public void init()
{
companyName.setFont(headlineFont);
numOfGuest.setFont(question);
con.setSize(500,400);
con.setLayout(new FlowLayout());
con.add(companyName);
con.add(numOfGuest);
con.add(answer);
answer.requestFocus();
con.add(perGuest);
con.add(eventCost);
answer.addActionListener(this);
perGuest.addActionListener(this);
eventCost.addActionListener(this);

}

public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if (source == perGuest)
{
String guestCnt = answer.getText();
int x = 0;
int cntInt = Integer.parseInt(guestCnt);
if (cntInt > guestCount.length);
guestPrice = price[x]; 

the program does compile and run

Thank you in advance,
Gina

[Ulf Dittmer]

If the program compiles and runs, then what is the problem? Does it not do what you expect it to do? Then you should describe how the expected behavior differs from the observed bahavior.

[Gina Ruffolo-Daniel]

It doesn't update the per guest cost or event cost when the user changes the guest count.

[Ulf Dittmer]

Is the actionPerformed method ever called? Is the "source == perGuest" condition ever true?

[Ernest Friedman-Hill]

Originally posted by Gina Ruffolo-Daniel:
It doesn't update the per guest cost or event cost when the user changes the guest count.

How do you know that? How is guestPrice displayed to the user?

[Gina Ruffolo-Daniel]

The values in the container don't change.

[Ernest Friedman-Hill]

Yes, that's what you said. But in any case, there is no code above that shows how guestPrice is displayed to the user, so if the problem is in fact with that part of the program -- especially the part that actually arranges for the new value to be displayed -- then you'll have to actually show us that part of the code ro we can't help you with it.

In general, changing the value of an int member variable will have absolutely no effect on any GUI display. Some code, somewhere, would have to deliberately do something to display the new value -- and you're not showing us any code that does anything like that.

[Gina Ruffolo-Daniel]

I apologize..I thought I had posted it in my orginial posting.. here it is

{
eventMsg.setText("The total event fee is: $" +
guestPrice);
con.add(eventMsg);
validate();
}  

Gina