How to assign the enter pressing to the button click event of swing button?

Question

Hello to all you pro's,
I can't find how to make my button a default button so it will respond to an enter press.
any help will be most appreciated.
thanks in advanced.

Answer 1

get the RootPane and call setDefaultButton on it. Something like so:
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 SwingFu2 extends JPanel
    private JButton buttonOK = new JButton("OK");
    private JButton buttonCancel = new JButton("Cancel");
    private JTextField textfield = new JTextField(12);
    private JFrame frame;
    SwingFu2(JFrame frame)
        this.frame = frame;
        ActionListener buttonActionListener = new ButtonActionListener();
        buttonOK.addActionListener(buttonActionListener);
        buttonCancel.addActionListener(buttonActionListener);
        add(textfield);
        add(buttonOK);
        add(buttonCancel);
        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 SwingFu2(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();
}