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Article View: borland.public.jbuilder.java.language
Article #8256

Re: Exception in thread "main"

#8256
From: PeterH
Date: Mon, 02 Apr 2001 19:51
101 lines
2950 bytes
Hello.

I'm relatively new too, but I thought I might take a stab at this one.

I think the proble might be in your main.

Instead of the line:

new uebung_3();


Try this:

    uebung_3 app = new uebung_3();

This way you have a new object called app which is instantiated from the
uebung_3 class.








"Mike" <mike.k@bluewin.ch> wrote in message
news:3AC8CE1A.CFD3E0CE@bluewin.ch...
> Hi there, im a newbie and i`ve a question.
> Im writing my first lessons of java in jbuilder 4.0
>
> I`ve done this little script here:
>
>
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
"""""""
>
> // Einbinden aller AWT-Klassen
> import java.awt.*;
>
> // Einbinden aller Event-Klassen des AWT-Systems
> import java.awt.event.*;
>
> class uebung_3 extends Frame {
>
>  /**
>   *  Der Konstruktor dient dazu, die Klasse nach dem Aufruf
>   *  zu initialisieren und muss den gleichen Namen wie
>   *  die Klasse haben.
>   */
>  public uebung_3() {
>
>   // Ueberschrift fuer das Fenster festlegen
>   setTitle("uebung_3.java");
>
>   // WindowListener
>   addWindowListener( new WindowAdapter() {
>    public void windowClosing(WindowEvent e) {
>     System.exit(0);
>    }
>   });
>
>   // einen Label definieren,
>   // der Text soll mittig sein
>   Label Anzeige = new Label("Dies ist ein Text", Label.CENTER);
>
>   // Label zum Fenster hinzufuegen
>   add(Anzeige);
>
>   // Groesse des Fensters festlegen
>   setSize(300,80);
>
>   // Fenster sichtbar machen (anzeigen)
>   setVisible(true);
>  }
>
>  /**
>   *  Die Hauptmethode main() wird fuer den Start benoetigt
>   */
>  public static void main( String[] args ) {
>
>   new uebung_3();
>  }
> }
>
>
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
"""""""""
>
> if i try to run this script, jbuilder returns with
> "Could not find the main class. Program will exit."
>
> I`ve specified the "Default runnable file" in the project-properties,
> the java file is uebung_3.java
>
> Thank you for answering!
>
> cya
>
> mike
>
>
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Subject: Re: Exception in thread "main"
Date: Mon, 2 Apr 2001 15:51:43 -0400
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