trying to get a value from another class

ok, erm..
in one class I have calculated a value 'total' now I want it to add to another total in another class that extends the same class. how do i take that value and add it to another in another class?

Hi Karis, welcome to the ranch.

Hope this helps to get your value from one class to another class.
Davy
[ March 03, 2004: Message edited by: Davy Kelly ]

thanks davy!! i will try it out

i do that but it inherits all the controls from the previous panel doubling up on checkboxes! is there a way to avoid this?

Karis,
Find the variable, that you want to get (total which you were chatting about), you could make it private in the class that it is in, then make an object of that class to access the variable that you want.
I have ammended the code to include a private variable and a get method, so that you can access the variable.

e.g.

does this help?
Davy
[ March 03, 2004: Message edited by: Davy Kelly ]

Give us more detail...it's rare to have a subclass contain a reference to an instance of a super class and be accessing its data in the way you describe. Perhaps your design could be improved and this problem will solve itself.
sev

thanks even though looking at this i am completely lost, but i'm sure i will get the knack of it eventually.

Karis,
Post some of your code and someone will see what is going on.
use the code button below the Add Reply button and place you code between the tags, this way it keeps indentation.
no doubt you will get a response which is more accurate to your neeeds.
Davy

import java.applet.Applet;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
//import java.net.*: this is going to be used for the client\server function later on#
//<html>
//<Body>
//<applet code =A2PizzaProgram.class width = 500 height =200>
//</applet>
//</body>
//</html>
public class A2PizzaProgram extends Applet {
pScpizzasizepanel;  
pIcpizzaindgredients;

public  void  init() {
setLayout ( new  GridLayout( 1,2));

pizzasizepanel = new pSc();
add(pizzasizepanel);

pizzaindgredients = new pIc();
add(pizzaindgredients);
}

}
class pSc extends Panel implements ItemListener{

CheckboxGroup oneCBG;
Checkbox Small, Medium, Large, SuperLarge;
pSc() {

oneCBG = new CheckboxGroup();

Small = new Checkbox("Small",false,oneCBG);
add(Small);
Small.addItemListener(this);
Medium = new Checkbox("Medium",false,oneCBG);
add(Medium);
//Medium.addItemListener(this);
Large = new Checkbox("Large",false,oneCBG);
add(Large);
//Large.addItemListener(this);
SuperLarge = new Checkbox("SuperLarge",false,oneCBG);
add(SuperLarge);
//SuperLarge.addItemListener(this);
}

private double total=0; 
public double getTotal()
{
return total;
}

public void itemStateChanged(ItemEvent e) {
if(Small.getState() == true);
total = 3.00;
}
}
class pIc extends Panel implements ItemListener {

TextField response;

Checkbox Pepporoni, Chilli, Anchovies,Ham, Mushrooms, Greenpeppers;
pIc() {

Pepporoni = new Checkbox("Pepporoni");
add(Pepporoni);
Pepporoni.addItemListener(this);
Chilli = new Checkbox("Chilli");
add(Chilli);
Chilli.addItemListener(this);
Ham = new Checkbox("Ham");
add(Ham);
Ham.addItemListener(this);
Greenpeppers = new Checkbox("Greenpeppers");
add(Greenpeppers);
Greenpeppers.addItemListener(this);
Mushrooms = new Checkbox("Mushrooms");
add(Mushrooms);
Mushrooms.addItemListener(this);
Anchovies = new Checkbox("Anchovies");
add(Anchovies);
Anchovies.addItemListener(this);
response = new TextField(10);
add(response);

}

public void itemStateChanged (ItemEvent e) {

//double total; //getting alot of 9999's and stuff need to round off some how.

double total = pSc.getTotal();
if(Pepporoni.getState() == true);
total += .60;
response.setText("�" + total);

if(Pepporoni.getState() == false) 
total -= .60;
response.setText("�" + total);

if(Ham.getState() == true);
total += .60; 
response.setText("�" + total);

if(Ham.getState() == false)
total -= .60;
response.setText("�" + total);
if(Greenpeppers.getState() == true);
total += .60;
response.setText("�" + total);

if(Greenpeppers.getState() == false)
total -= .60;
response.setText("�" + total);
if(Anchovies.getState() == true);
total += .60;
response.setText("�" + total);

if(Anchovies.getState() == false)
total -= .60;
response.setText("�" + total);
if(Mushrooms.getState() == true);
total += .60;
response.setText("�" + total);

if(Mushrooms.getState() == false)
total -= .60;
response.setText("�" + total);

if(Chilli.getState() == true);
total += .60;
response.setText("�" + total);

if(Chilli.getState() == false)
total -= .60;
response.setText("�" + total);

}
}

HELP! i get
---------- Java Complier ----------
A2PizzaProgram.java:115: non-static method getTotal() cannot be referenced from a static context
double total = pSc.getTotal();
^
1 error
Normal Termination
Output completed (0 sec consumed).
[ March 08, 2004: Message edited by: Karis Brown ]

BUMP!

You can't use non-static methods in static context. What do I mean by that? Well:
class ClassA {
public String aMethod() {
return "Hello";
}

public static String anotherMethod() {
return "Hello Again";
}
}
class ClassB {
// legal
ClassA instanceOfClassA = new ClassA();
String helloString = instanceOfClassA.aMethod();
// illegal
String helloString = ClassA.aMethod();
// legal
String halloAgainString = ClassA.anotherMethod();
}
Why? Unless a method is declared static then it is only accessable through an instance of that class. If you want to use your getTotal() method, either declare it static, or create an instance of pSc and call it on that. Does this make sense?

Kinda, I'm VERY new to this Java so an example would be nice please!

LALALALLALALA! HAHAH!! :LOL! LMAO!! THANK YOU VERY MUCH!!!
U GUYS ARE GREAT!!!
Its working now!!
Thanks again, thanks!!

[ March 09, 2004: Message edited by: Karis Brown ]
[ March 09, 2004: Message edited by: Karis Brown ]

well done Karis,
Davy