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The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes forward refrerences Big Moose Saloon
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forward refrerences

Kedar Dravid
Ranch Hand

Joined: May 28, 2004
Posts: 333
How is it that the following code prints 0?
Why doesn't it throw a compiler error, because of the forward reference to j?

public class AQuestion
{
private int i = giveMeJ();
private int j = 10;

private int giveMeJ()
{
return j;
}

public static void main(String args[])
{
System.out.println((new AQuestion()).i);
}
}
Ransika deSilva
Ranch Hand

Joined: Feb 18, 2003
Posts: 524
Hi Kedar,
I guess it is because the variable j is refered before it is getting initialized so that it returns the defualt value for the int data type, Hope it make sence.


SCJP 1.4, SCMAD 1.0<br />SCWCD, SCBCD (in progress)
Arunkumar Ayyavu
Greenhorn

Joined: Dec 08, 2004
Posts: 1
Forward references apply only to the variables. It doesn't apply to the methods.

This restriction is done to avoid circular references. For e.g.,
int i = j;
int j = i;
This circular reference issue will not occur in Methods.

But you might ask about this:
private void m1() {m2();}
private void m2() {m1();}
In this example, the compiler doesn't know what the methods do.
Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
If you search this forum for "giveMeJ" you will see that this question has come up often. Here's Corey's Tipline Article on the topic.


Ask a Meaningful Question and HowToAskQuestionsOnJavaRanch
Getting someone to think and try something out is much more useful than just telling them the answer.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: forward refrerences