Solved

Compilation error

Posted on 2002-03-03
8
193 Views
Last Modified: 2010-08-05
Hi!
Does anyone know what this compilation error means?

"StudentRegister.java:14: non-static variable this cannot be referenced from a static context
                                Car c = new Car();"
                                        ^


(Car is a second class in my program)
                                           
0
Comment
Question by:Cat75
8 Comments
 
LVL 16

Expert Comment

by:Peter Kwan
ID: 6837406
Can you please post code of the section of your StudentRegister class that causes the problem?
0
 
LVL 16

Expert Comment

by:Peter Kwan
ID: 6837420
Sorry, can you please show the code of your Car class (not the StudentRegister class), especially the constructor if you have it?
0
 
LVL 2

Expert Comment

by:cyberfrank
ID: 6837432
The problem is that you can not use "this" variable in the static method. Static means static content for the all objects instantiated for the given class, so there is no meaning of "this". The "this" variable can be only used inside of non-static method of the instantiated object.
I am sure, that You try to call some static method from the Car() constructor and that static method used "this" variable.

BR,

Cyberfrank
0
 
LVL 3

Expert Comment

by:daitt
ID: 6837576
I think the problem might be that Car is an inner class and can be constructed only with a this object. You put the code to construct Car in a static method, which cannot refer to "this".
For example:
class Main{
class Car{
}
public static void test(){
Car c = new Car();
}
}

I still don't understand why the error started at c, not Car(). Maybe it's a different problem. Post your code, please.
Just guessing,
daitt
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Accepted Solution

by:
Senthilb earned 50 total points
ID: 6838502

Hi

U r not shown the full program

But my guess is

1. u may defined Car as Inner class
2. check out u have default constructor for "Car" class
3. Move u r "Car" class description before creating object.



0
 
LVL 3

Expert Comment

by:daitt
ID: 6838605
Senthilb:
1. I said about this already in my comment.
2. This will cause "cannot resolve symbol" error, not the error Cat75 said.
3. This is Java, not C. The class declaration can be anywhere.

Cat75: what is the answer for your question?
0
 

Author Comment

by:Cat75
ID: 6838875
Car was an inner class. I chose the explanation that I understood the best. Sorry :/
0
 
LVL 3

Expert Comment

by:daitt
ID: 6839048
Are you sure you understood the problem?
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
numbers ascending pyramid 100 141
factorial example 4 35
servlet example issue 6 33
tomcat administrtor 12 34
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now