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  Communication between classes  (Read 1175 times)
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Offline draziw123

Junior Newbie




Java games rock!


« Posted 2004-02-17 00:09:23 »

Hello.  Im Developing a lemonade based game and i have a question.  How do you pass information through classes is basically it.  The first class handles the menus that occur between game days (what inventory do you want to purchse...type question) the second class handles the animation and the processing of the game day information.  I have a third class called inventoryItem.  This class is created for each inventory item to handle things like the number of that item, ect.
--> inventoryItem Hamburger = new inventoryItem();  //ex
 How can I pass the inventoryItem to the second class, make changes to it and then get those change back to the first class and visa versa?  (Im a c++ programmer and java is weird to me without the pass by value/reference stuff in c++)
Any help would greatly be aprreciated!
Offline Matzon

JGO Knight


Medals: 19
Projects: 1


I'm gonna wring your pants!


« Reply #1 - Posted 2004-02-17 04:02:43 »

Quote
Cook cook = new Cook();
InventoryItem hamBurger = new HamBurger();
InventoryItem cheeseBurger = cook.addChese(hamBurger);

Offline Matzon

JGO Knight


Medals: 19
Projects: 1


I'm gonna wring your pants!


« Reply #2 - Posted 2004-02-17 04:05:09 »

This is a *really* basic OO question. You might want to readt the Java Tutorial:
http://java.sun.com/docs/books/tutorial/

specifically:
Learning the Java Language
http://java.sun.com/docs/books/tutorial/java/index.html

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Offline Jeff

JGO Coder




Got any cats?


« Reply #3 - Posted 2004-02-19 01:50:13 »

Here's the trivk, froma  C++ POV.

All Java calls are calls by value HOWEVER
an object  is not the value on an object variable.  An object *reference* is the value.

So if I have

Object foo = thisobject;

Then the value of foo is a reference (think pointer in c++) to the same object that thisobject references.

so if barobject has a method

public method mycall(Object bar){
 bar.intfield = 1;
}

and it is called as follows

barobject.mycall(foo)

Then the obejct known to the caller as foo will get its intfield set to 1.

See?

The thing to remember is that Object variables are references TO objects, not the objects themselves.  So although the variable is passed by value, that value IS a reference (like a C/C++ pointer).

Got it?





mycall ends  up with a referene to the same obejctfoo referenced.  Any methdo invocations

Got a question about Java and game programming?  Just new to the Java Game Development Community?  Try my FAQ.  Its likely you'll learn something!

http://wiki.java.net/bin/view/Games/JeffFAQ
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