Regarding Listener

[adeeb]

Hi,
I used a JButton in an application, which handles a particular function but i can only click it mouse how can i use or activate the enter key. So that i can handle it from keyboard also.
Thanks and Regards.

[sukatoa]

how about KeyListener?

I forgot what is the "Enter" key ascii code....
but you can use the KeyEvent's instance to access it's member/method that retrieves all info about the event made...

The best approach is to have some experiments on it....

[Fubarable]

It sounds as if you want to set your button as the default button for that window. This can be easily done by calling the JRootPane method, setDefaultButton(...). For example:

Code:

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

class DefaultButtonTest extends JPanel
{
  private JButton buttonOK = new JButton("OK");
  private JButton buttonCancel = new JButton("Cancel");
  private JTextField textfield = new JTextField(12);
  private JFrame frame;

  DefaultButtonTest(JFrame frame)
  {
    this.frame = frame;
    ActionListener buttonActionListener = new ButtonActionListener();
    buttonOK.addActionListener(buttonActionListener);
    buttonCancel.addActionListener(buttonActionListener);

    add(textfield);
    JPanel buttonPanel = new JPanel(new GridLayout(1, 0, 5, 0));
    buttonPanel.add(buttonOK);
    buttonPanel.add(buttonCancel);
    add(buttonPanel);

    frame.getRootPane().setDefaultButton(buttonOK);
  }

  private class ButtonActionListener implements ActionListener
  {
    @Override
    public void actionPerformed(ActionEvent e)
    {
      String command = e.getActionCommand();
      if (command.equalsIgnoreCase("OK"))
      {
        System.out.println("OK pressed");
        System.out.print("Text in textfield: ");
        System.out.println(textfield.getText());
      }
      else if (command.equalsIgnoreCase("Cancel"))
      {
        frame.dispose();
      }
    }
  }

  private static void createAndShowUI()
  {
    JFrame frame = new JFrame("SwingFu1");
    frame.getContentPane().add(new DefaultButtonTest(frame));
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String[] args)
  {
    java.awt.EventQueue.invokeLater(new Runnable()
    {
      public void run()
      {
        createAndShowUI();
      }
    });
  }
}