extended JPanel is empty

**pottsiex5** · November 23rd, 2011, 02:15 PM

Hi,
I made a extended JPanel, but when i call on it in another class the panel shows but its empty... This is my code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FindPanel extends JPanel
{ 
    JRadioButton biologyClass = new JRadioButton("Biology");
    ...make a radiobutton for each subject
 
    ButtonGroup classButtonGroup = new ButtonGroup();
    public void classesJPanel() {
        //add to button group
        classButtonGroup.add(biologyClass);
        ... add all the subjects to buttongroup
        //add to panel
        add(biologyClass);
        ...add all the subjects
        }
 
 
 
}

when i call on the code this is what i am using:

FindPanel jPanel1 = new FindPanel();

Thanks
Joel

**pottsiex5** · November 23rd, 2011, 02:27 PM

I should also point out that im trying to call it in an applet. I called it in a normal JFrame and it worked fine, it just doesnt like the applet...

**mwr76** · November 23rd, 2011, 02:29 PM

You do not have a constructor for your FindPanel Class. You need an overide constructor

**pottsiex5** · November 23rd, 2011, 02:37 PM

How do i make an override constructor? What is it exactly?

**snowguy13** · November 26th, 2011, 03:59 PM

JPanel is your superclass, in this case, so you need to insert the code...

super(String title)
 
//title is what the dialog box will be named in its title bar

...before your other code.

You also need to surround everything you have so far except the class name in...

public FindPanel() {
//your other code here
}

So, when it's all put together, the end result should be something like this:

public class FindPanel extends JPanel
{
   public FindPanel()
   {
 
      super(String title)
      //Note that you will not actually type "String title"; instead you
      //should type what you want the dialog to be titled when you open it
 
      //Put all your other code here, like the JRadioButton and ButtonGroup, etc.
      //Don't include the "public void classesJPanel()" part, just remove those brackets
      //The "super" constructor already creates a JPanel, and you're just customizing it
 
   }
}

Hopefully I got my meaning through... Sorry if it's unclear.

Thread: extended JPanel is empty

LinkBack

Thread Tools

Display

extended JPanel is empty

Related threads:

Re: extended JPanel is empty

Re: extended JPanel is empty

Re: extended JPanel is empty

Re: extended JPanel is empty

Similar Threads

checked or unchecked exception when Throwable is extended

Extended Hanooi Tower

Imitating a JFrame extended program with JPanel; help needed...

How to copy image from one jpanel to another jpanel

Creating and displaying a JPanel inside another JPanel