Execute JButton when ENTER key is pressed in panel - Swing

Question

I have Login JButton on a panel and I need to execute it when I press ENTER key.

Do we have any code snippet for that?

Answer 1

To have initial focus on your button you can do something like this:

frame.getRootPane().setDefaultButton(buttonName);
buttonName.requestFocus();

---

//Or you can bind your Enter key to JComponent and JButton as:

AbstractAction action = new AbstractAction() {
    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() instanceof JButton){
        JButton button = (JButton) e.getSource();
        button.doClick();        
        } else if(e.getSource() instanceof JComponent){
            JComponent component = (JComponent) e.getSource();
            component.transferFocus();
        }
    }
    };

//You can bind key to JComponent like:

jComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "TransferFocus");
jComponent.getActionMap().put("TransferFocus", action);

//You can bind key to JButton like:

jButton.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "DoClick");
jButton.getActionMap().put("DoClick", action);

---

Useful Link

How to Use the Focus Subsystem

Answer 2

You can use InputMap and ActionMap to do this.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class ac1
{
    public static void main(String args[])
    {
    JFrame f=new JFrame();
    f.setVisible(true);
    f.setSize(400,400);
    f.setLayout(new FlowLayout());

    final JButton b=new JButton("button");
    f.add(b);



f.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDO

W).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0),"clickButton");

f.getRootPane().getActionMap().put("clickButton",new AbstractAction(){
        public void actionPerformed(ActionEvent ae)
        {
    b.doClick();
    System.out.println("button clicked");
        }
    });
    }
}