Thread: static &netbeans

this program in notepad is correct i run it in cmd
but this is not correct in netbeans
the error is non-static variable this cannot be referenced from a static contex
i change the SimpleFrame class up the SimpleFrameTest i run my program in netbeans
this is not run notepad
i do not understand!?

import javax.swing.*;
 
 
public class SimpleFrameTest
{
   public static void main(String[] args)
   {
      SimpleFrame frame = new SimpleFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS  E);
      frame.setVisible(true);
   }
}
 
class SimpleFrame extends JFrame
{
   public SimpleFrame()
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
   }
 
   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;
}

Netbeans is just a convenient wrapper for the command line compiler javac. It is not possible for it to compile on the command line and not in netbeans since they do exactly the same thing.

Your code runs correctly on my machine with ONE exception. It looks like you accidentally hit the space bar a few times

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS  E);

Do you see those space in CLOS E? Remove them and it compiles.

You can save yourself a heap of time by looking at the error message. It will tell you what line the problem is occuring on. Posting the error message will also help us help you so they are very important.

I still don't understand. This runs fine in netbeans. I didn't want to have to open it up to prove it but I did. If it compiles in the command prompt, it compiles in netbeans. Like I said, they do the same thing.

i posted error the error is
non-static variable this cannot be referenced from a static contex
in line SimpleFrame frame = new SimpleFrame();

No this is a description of the error you have typed up. Copy and paste the exact error message you are getting.

What version of Java are you using. To check , type this in the command prompt

$ javac -version
javac 1.7.0_02

What version of netbeans?

Most likely this is a user error - something you are not doing correctly. There is a very slight chance it could be a problem with netbeans. You could try uninstalling and reinstalling.

my java and netbeans version
Product Version: NetBeans IDE 7.0.1 (Build 201107282000)
Java: 1.6.0_07
i copy and past the error in netbeans

I:\javaprogarm\SimpleFramTest\src\simpleframtest\SimpleFramTest.java:19: non-static variable this cannot be referenced from a static context
        SimpleFrame frame = new SimpleFrame();
1 error
I:\javaprogarm\SimpleFramTest\nbproject\build-impl.xml:603: The following error occurred while executing this line:
I:\javaprogarm\SimpleFramTest\nbproject\build-impl.xml:245: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 3 seconds)

Okay cool. Check the name of the java file. It should be SimpleFrameTest.java. In the error message it says the file is SimpleFramTest.java (missing the 'e' in Frame)

Originally Posted by ardashir

thank you
my Problem is solution

Don't forget to credit the one, who helped you. Either add to their reputation or hit thanks that will auto add to reputation (if i am not wrong).