🚀 go-pugleaf

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..

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