RadioButtons and if statements and more....

[Justin Kuyken]

Hi,
I am creating a program for school and was wondering if someone could help me in figuring out how i could add a section to my program where if the user selects a specific radio button in the group that a JList and a Jbutton appear in the container with everything else and if that radio button is no longer selected the list and button disapear again.
I've tried playing around with ItemListeners and flags but to no luck...
If possibly please explain in simple terms as i am not really up with the technical phrases thanks,
Any help would be greatly appreceated.
[ September 07, 2004: Message edited by: Justin Kuyken ]

[Ilja Preuss]

I think an ActionListener on the radio button should work.

[Max Rahder]

Read the Swing Tutorial. It's great. http://java.sun.com/docs/books/tutorial/uiswing/

Here's a crude example:

  
package example;
import java.util.*;
 
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
 
public class ButtonGroupExample extends JFrame {
  private JPanel topPanel = new JPanel();
  private JPanel centerPanel = new JPanel();
  private ButtonGroup showHideButtonGroup = new ButtonGroup();
  private JList theList = new JList( new String[]{"One", "Two", "Three"} );
  private JButton theButton = new JButton("Button");
  private JRadioButton showButton = new JRadioButton("Show");
  private JRadioButton hideButton = new JRadioButton("Hide");
  
  public ButtonGroupExample(){
 
    showButton.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e){
        showHideAction(e);
      }
    });
    hideButton.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e){
        showHideAction(e);
      }
    });
    
    topPanel.add(showButton);
    topPanel.add(hideButton);
 
    showHideButtonGroup.add(showButton);
    showHideButtonGroup.add(hideButton);
 
    centerPanel.add(theList);
    centerPanel.add(theButton);
    
    getContentPane().add(topPanel, BorderLayout.NORTH);
    getContentPane().add(centerPanel, BorderLayout.CENTER);
    
    pack();
    
  }
  
  private void refreshGUI(){
    theList.setVisible(showButton.isSelected());
    theButton.setVisible(showButton.isSelected());
  }
  private void showHideAction(ActionEvent e){
    refreshGUI();
  }
 
  public static void main(String[] args) {
    JFrame f = new ButtonGroupExample();
    f.show();
  }
}