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Thread: static &netbeans

  1. #1
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    Default 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;
    }


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    Default Re: static &netbeans

    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.

  3. #3
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    Default Re: static &netbeans

    i posted error the error is
    non-static variable this cannot be referenced from a static contex
    in line SimpleFrame frame = new SimpleFrame();
    The code is my post have space in my computer do not space
    you run my code in netbeans or cmd
    i know this same
    you change the code and run it?
    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;
    }
     
     
     
    public class SimpleFrameTest
    {
       public static void main(String[] args)
       {
          SimpleFrame frame = new SimpleFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
       }
    }
    this code run in netbeans and do not run in cmd!?
    Last edited by ardashir; January 7th, 2012 at 09:01 AM.

  4. #4
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    Default Re: static &netbeans

    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.

  5. #5
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    Default Re: static &netbeans

    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)

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    Default Re: static &netbeans

    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)

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    Default Re: static &netbeans

    thank you
    my Problem is solution
    Last edited by ardashir; January 11th, 2012 at 12:32 AM.

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    Default Re: static &netbeans

    Quote Originally Posted by ardashir View Post
    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).

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