JFrame question on unresolved symbol ???

[Douglas Braxton]

please see comment below // FOLLOWING LINE GEN's COMPILE ERROR
error is
TwoButtons.java [38:1] cannot resolve symbol
symbol : class MyDrawPanel
location: class TwoButtons
MyDrawPanel drawPanel = new MyDrawPanel();

/*
 * TwoButtons.java
 * Created on April 20, 11:47 AM
 * Class: CIS148 - JAVA Programming (Tu-Th Spring 2004)
 * Instructor: Ram Athavale 
 *
 * @author Douglas J. Braxton
 * @version 1.0
 *
 *    CIS148 - JAVA Programming - Wake Technical CC - Spring - 2004.    
 */
/*
 * Filename TwoButtons.java
 */
// java packages are imported
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
// Filename is TwoButton.java                                     
public class TwoButtons extends JFrame    {
    JFrame frame;;
    JLabel label;
    public TwoButtons()    {
        super( "Demonstrate two button concept using nested frames" );
        TwoButtons gui = new TwoButtons();
        gui();
     }
    public void gui() {
        frame = new JFrame(  );
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JButton labelButton = new JButton("Change label");
        labelButton.addActionListener( new LabelListener());
        JButton colorButton = new JButton("Change circle");
        colorButton.addActionListener(new ColorListener());
        
// FOLLOWING LINE GEN's COMPILE ERROR   
        MyDrawPanel drawPanel = new MyDrawPanel(); 
         
        frame.getContentPane.add(BorderLayout.South, colorButton);
        frame.getContentPane.add(BorderLayout.Center, drawPanel);
        frame.getContentPane.add(BorderLayout.East, labelButton);
        frame.getContentPane.add(BorderLayout.West, label);
        frame.setSize(500, 500);
        frame.setVisible(true);
    } 
        class LabelListener implements ActionListener
        {
            public void ActionPerformed(ActionEvent event)
            {
                label.setText("Changed");
            }
            
            public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
            }
            
        }//terminate labelListener
        class ColorListener implements ActionListener
        {
            public void ActionPerformed(ActionEvent event)
            {
                frame.repaint();
            }
            
            public void actionPerformed(java.awt.event.ActionEvent actionEvent) {
            }
            
     }//terminate colorListener 
public static void main (String[ ] arg)
    {
        
        System.exit(0);
    }        
}

[ April 20, 2004: Message edited by: Douglas Braxton ]

[maggie woo]

Hmm...
Where exactly is the MyDrawPanel.java file anyhow? More specifically, where is it in relation to the TwoButtons.java file?

[Douglas Braxton]

maggie
this was something my instructor put on the board and did not explain very well.
are you saying i need a new class file called MyDrawPanel.
i thought it was a methiod?
doug

[maggie woo]

Ah. yes. you need a MyDrawPanel.java file that probably does something like extend javax.swing.JPanel, and probably has other interesting (or mundane) things on it like buttons, graphics, spinners, whatnot.
Since it seems to be a drawingpanel, have fun! I can't really help you out without digging up MY coursework from oh 5 years ago.

[Douglas Braxton]

okay thanx!

[Gregg Bolinger]

To get by without creating another class, just change the MyDrawPanel in your code to JPanel.