setMnemonic() not working

[Vidur Koushik]

Hello..
I have written a small program..this is the example program shown in the official tutorials(uiswing) on oracle website..
i only made some minor changes..but somehow setMnemonic() is not working..
Can somebody please point out my mistake..
Here's My code..

/*
 * RadioButtonDemo.java requires these files:
 *   images/Bird.gif
 *   images/Cat.gif
 *   images/Dog.gif
 *   images/Rabbit.gif
 *   images/Pig.gif
 */
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class RadioButtonDemo extends JPanel implements ActionListener
{
  static String BirdString = "Bird";
  static String CatString = "Cat";
  static String DogString = "Dog";
  static String RabbitString = "Rabbit";
  static String PigString = "Pig";

  JLabel picture;
  public RadioButtonDemo()
   {
     super(new BorderLayout());
       
      JRadioButton BirdButton = new JRadioButton(BirdString);
      BirdButton.setMnemonic(KeyEvent.VK_B);
      BirdButton.setActionCommand(BirdString);
      BirdButton.setEnabled(true);
	  BirdButton.addActionListener(this);

      JRadioButton CatButton = new JRadioButton(CatString);
      CatButton.setMnemonic(KeyEvent.VK_C);
      CatButton.setActionCommand(CatString);
	  CatButton.addActionListener(this);

      JRadioButton DogButton = new JRadioButton(DogString);
      DogButton.setMnemonic(KeyEvent.VK_D);
      DogButton.setActionCommand(DogString);
	  DogButton.addActionListener(this);

      JRadioButton RabbitButton = new JRadioButton(RabbitString);
      RabbitButton.setMnemonic(KeyEvent.VK_R);
      RabbitButton.setActionCommand(RabbitString);
	  RabbitButton.addActionListener(this);

      JRadioButton PigButton = new JRadioButton(PigString);
      PigButton.setMnemonic(KeyEvent.VK_P);
      PigButton.setActionCommand(PigString);
	  PigButton.addActionListener(this);

      ButtonGroup group  = new ButtonGroup();

      group.add(BirdButton);
      group.add(CatButton);
      group.add(DogButton);
      group.add(RabbitButton);
      group.add(PigButton);
	  
     picture = new JLabel(createImageIcon("images/" + BirdString + ".gif"));
     picture.setPreferredSize(new Dimension(177,122));
	 
	 JPanel RadioPanel = new JPanel(new GridLayout(0,1));
	  RadioPanel.add(BirdButton);
      RadioPanel.add(CatButton);
      RadioPanel.add(DogButton);
      RadioPanel.add(RabbitButton);
      RadioPanel.add(PigButton);
	 add(RadioPanel,BorderLayout.LINE_START);
	 add(picture,BorderLayout.CENTER);
	 setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
   }
   public void actionPerformed(ActionEvent e)
   {
    picture.setIcon(createImageIcon("images/"+e.getActionCommand()+".gif"));
   }
   protected static ImageIcon createImageIcon(String path) 
    {
        java.net.URL imgURL = RadioButtonDemo.class.getResource(path);
        if (imgURL != null) 
		{
            return new ImageIcon(imgURL);
        } else 
		{
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }
    public static void createandshowgui()
	{
	  JFrame frame = new JFrame("RadioButtonDemo");
	  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	  JComponent newContentPane = new RadioButtonDemo();
	  newContentPane.setOpaque(true);
	  frame.setContentPane(newContentPane);
	  frame.pack();
	  frame.setVisible(true);
	}
	public static void main(String args[])
	 {
	   createandshowgui();
	 }
}

Thank You.

[Paul Clapham]

My guess is that KeyEvent.VK_B represents "b" and you're expecting the setMnemonic method to make that apply to a different letter, namely "B".

Edit: No, that's wrong. The documentation says that setMnemonic is case-insensitive. So, what makes you think it isn't working?

[Keshan Pillay]

I believe I've read before (I'll try and look it up to cite this) that with Jbuttons you set the mnemonic but you need to access it with the 'ALT' key.
So try 'ALT + B' etc. Let me know.

I cant find the documentation however...

JavaDocs

This is a little SSCCE example from the website which is a JButton with the Mnemonic 'A' set to it. Indeed, if you press 'A' nothing happens
however if you try 'Alt + A' then the button is pressed.

[Vidur Koushik]

Thank You @@Keshan Pillay and @@Paul Clapham
I realized that we have to press "ALT+B".
and it that is the way it works.

Thanks once again for your replies.