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initialisation / declaration of variable

Gaelle Berton
Greenhorn

Joined: Mar 24, 2011
Posts: 6
i stumbled across this in the practice exam book of Sierre Bates


the code compiles:

Shouldnt the "size" variable be declared before the constructor uses it? why doesnt it matter?
thanks
shuba gopal
Ranch Hand

Joined: May 12, 2011
Posts: 76
Hi Gaelle, is size declared before the Wheel constructor is invoked? In that case it shouldnt be a problem you agree? Can you please post the entire program for my understanding. Is it from K & B SCJP 6?
Gaelle Berton
Greenhorn

Joined: Mar 24, 2011
Posts: 6
yes it is this same exam practice book:

...
..


shuba gopal
Ranch Hand

Joined: May 12, 2011
Posts: 76
Gaelle, I tried it



I am getting the following errors:



The declaration int size is missing in Bicycle. Where does it occur?
I looked thru the pdf version of the book but was not able to find this problem. Can you tell me the chapter/page number. thanks
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24187
    
  34

Shuba, your definition of the "Wheel" class is just missing the declaration of "size" which appears at the bottom of the class, as shown in the first post above; that's the whole point of this thread. All the other stuff you've posted, including your initial request for more code, is just a distraction and is not relevant, so let's just try to stick to the actual question, shall we?

Gaelle, the fact is simply that when the code inside a method or constructor body is compiled, all the members of that class are in scope. They don't need to be forward declared; it's perfectly OK -- and rather common -- for a method to refer to a variable or method which is declared later on in the same class.


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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 40052
    
  28
Are you sure it's s = size; rather than size = s;?
 
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