Java "Cannot Find Symbol"

radicaledward · 05-18-2006, 09:41 PM

Okay, I just can figure this out. I'm fairly new to Java but not programming on the whole. Am I missing something obvious here?

Code:

package dmpanel;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class MainPanel extends JPanel implements ActionListener {
    
    public static void main(String args[]){

    } 
    
    MainPanel() {
        createAndShowGUI casg = new createAndShowGUI();
        JTextField d20 = new JTextField();
    }

    void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);

        JFrame frame = new JFrame("DMPanel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        addPanelsToPane(frame.getContentPane());

        frame.pack();
        frame.setVisible(true);
    }
    
    public void actionPerformed(ActionEvent evt) {
        
    }
       
}

I know the code is kind of a mess but i'm just playing around trying to make a dnd DM's panel. (I also didn't include a fair number of methods that don't matter).
The compiler complains it cannot find createAndShowGUI when I try to initialize it in the contstructor (or if I try and do it in the main method it complains too). Help please!

paulsm4 · 05-18-2006, 11:02 PM

Hi -

Your class name must == your constructor name, which == your source file name. for example:

Code:

class CreateAndShowGUI extends JPanel implements ActionListener {
    
    public static void main(String args[]){
        CreateAndShowGUI casg = new createAndShowGUI();

    } 
    
    CreateAndShowGUI () {
        JFrame.setDefaultLookAndFeelDecorated(true);

        JFrame frame = new JFrame("DMPanel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        addPanelsToPane(frame.getContentPane());
        JTextField d20 = new JTextField(); // Not sure where this belongs ... but not in main()!
        frame.pack();
        frame.setVisible(true);
    }
    
    public void actionPerformed(ActionEvent evt) {
        
    }
       
}

ppanyam · 05-19-2006, 01:00 AM

In your program, replacing

<code> createAndShowGUI casg = new createAndShowGUI(); </code>

with the code

<code> createAndShowGUI(); </code>

should work. In your program, "createAndShowGUI" is a method, and you are trying to create an object from it. You can create an object from a class with new(...).

Prabhakar Panyam