error in code

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chandu - 21 Dec 2005 14:02 GMT

hai
i am getting run time excepton Stack overflow exceptin in mai n thread
for below code
class a{
a a1=new a();
void f(){}
}
class my{
public static void main(String aa[]){
a a2=new a();
a a3=new a();
}
}

and if i do not create any object of a in main or i keep stmt a a1=new
a();in f() erro r not coming.can u please tell me reason.y cont i
instantiate a class with in the same class.are there any issues..

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Haider Albassam - 21 Dec 2005 14:21 GMT

This is because when you instantiate an object a2 in main, it will
instantiate the object a1 *before* calling the constructor, and because
a1 has it's own a1 you will never execute the constructor, and this
loop will overflow the stack. Still, you can use object a1 inside the
class (a) but without instantiate it.
Cheers,

Haider

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chandu - 22 Dec 2005 08:32 GMT

hai thanx for your solution..and i want to ask you one more question
..why cont java support main functions without string
parameteres(command liine arguments) like in other languages
c,c++...and suggest me any site or book which hav advanced topics of
core javA

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Andrew Thompson - 22 Dec 2005 09:41 GMT

> hai thanx for your solution..and i want to ask you one more question
> ...why cont java support main functions without string
> parameteres(command liine arguments)

The main(String[] args) method is *the* method called as the
entry point to a Java program, but the length of args[] can be
0 - no parameters.

Also, rather confusingly, you can have a main() method in
your applicaton, just it is not *the* 'main' method. It
will *not* be called by default by the VM.

HTH

Signature

Andrew Thompson
physci, javasaver, 1point1c, lensescapes - athompson.info/andrew

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Malte Christensen - 22 Dec 2005 09:59 GMT

> hai thanx for your solution..and i want to ask you one more question
> ..why cont java support main functions without string
> parameteres(command liine arguments) like in other languages
> c,c++...and suggest me any site or book which hav advanced topics of
> core javA

Start here:

http://java.sun.com/docs/books/tutorial/index.html

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Malte Christensen - 21 Dec 2005 14:24 GMT

> hai
> i am getting run time excepton Stack overflow exceptin in mai n thread
[quoted text clipped - 13 lines]
> a();in f() erro r not coming.can u please tell me reason.y cont i
> instantiate a class with in the same class.are there any issues..

Looks to me as if you keep spawning instances of class a. Why would you
do this?

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Alan Krueger - 21 Dec 2005 18:47 GMT

>> hai
>> i am getting run time excepton Stack overflow exceptin in mai n thread
>> for below code

[...]

> Looks to me as if you keep spawning instances of class a. Why would you
> do this?

A lame distributed denial-of-service attack? I suspect there were a few
that plugged the program into a Java IDE, compiled it, and ran it to see
what would happen.

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Monique Y. Mudama - 21 Dec 2005 17:19 GMT

Even in such short code, it's a good idea to stick to java naming
conventions.

Specifically, class A and class My (horribly named as they are) are at
least obviously classes because of the capitalization. Lowercase
classes are jarring (no pun intended).

Signature

monique

Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html

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