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g is a variable name, so the method called "paint" is called from another
program
by passing another "Graphics" type

eg

Graphics myG = new Graphics();
paint(myG);

could be a possible way of calling this method the "g" within the method has
a drawString method as g is of type Graphics

eg

Graphics.drawString(jav.util.Stirng, int,int)

exists.

Alan


"David Belavy" <dbelavy@mail.com> wrote in message
news:JfBL4.425$v85.2035@news-server.bigpond.net.au...
> Hello Everyone,
>
> I'm learning to program from the Deitel & Deitel book and I was just
> wondering what the 'g' means in
>
> public void paint (Graphics g)
>     {
>         g.drawString("String", 25,25);
>     }
>
>
> What does the g actually refer to?
>
> Thanks,
>
> David
>
>

Hi,

David Belavy wrote:
 
> Hello Everyone,
 
> I'm learning to program from the Deitel & Deitel book and I was just
> wondering what the 'g' means in
> 
> public void paint (Graphics g)
>     {
>         g.drawString("String", 25,25);
>     }
 

> What does the g actually refer to?


The above code is a method (aka routine), and is called "paint"

The method requires a parameter. The required parameter needs to be an
object, of type "Graphics" (aka an object of class "Graphics" aka an
instance of the Graphics class)

The "g" is used to reference this "Graphics" object. When you want to do
something with this object (which has been passed to the method as a
parameter) you refer to it as "g", and if you call methods in it, you
use g.methodname(parameters), as can be seen with "g.drawString..."

Whenever you declare a variable (like g) you need to write it's "type"
and then a name for it. (You refer to it with it's name). This is why in
the parameter section you see "Graphics g". Its declaring that there
will be a variable "g" which refers to an object/instance of type/class
"Graphics". In this case, the object is being passed to the method by
whatever called the method i.e object already exists, and doesn't need
to be created ("new").

Hope this isn't confusing.

Regards,

Ross..

-- 
*TO E-MAIL ME: Reverse the order of the domain name in my e-mail
address.*

Ross Vumbaca, a 'poor' Uni student at USyd.edu.au
http://www.fl.net.au/~rossv, e-mail: rossv@fl dot net dot au (fix this
if you e-mail me!)

Running on an Amiga 3000, NEC M700 17" thingy,
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("Designed in Australia", and keeping the Zorro bus populated).
--

g is the instance of an object of type Graphics

for example
if i declare
String myString = "cool";

i have just created an attribute of type String.
with that attribute comes all sorts of methods i can call because of
this fact.
eg
myString.charAt(2); // returns 'o'
this is because the class String has this method, and myString is of
type String.
so it is a similar thing with g
paint is passed a parramater of type Grapgics, you can then access all
those cool methods that come with an attribute of type g such as
drawString().
did that help?

David Belavy wrote:

> Hello Everyone,
>
> I'm learning to program from the Deitel & Deitel book and I was just
> wondering what the 'g' means in
>
> public void paint (Graphics g)
>     {
>         g.drawString("String", 25,25);
>     }
>
> What does the g actually refer to?
>
> Thanks,
>
> David

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