How to add shortcut keys to JButton in Java?

I have a JButton and I want to assign a shortcut to it Just like I press delete it on the keyboard, just click JButton once How can I do this?

Solution

You need to create the action used by the button Then actionlistener can use action, and you can bind the action to keystroke

Read swing tutorial There are the following parts:

>How to use actions > how to use key binding

For example:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class CalculatorPanel extends JPanel
{
    private JTextField display;

    public CalculatorPanel()
    {
        Action numberAction = new AbstractAction()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
//              display.setCaretPosition( display.getDocument().getLength() );
                display.replaceSelection(e.getActionCommand());
            }
        };

        setLayout( new BorderLayout() );

        display = new JTextField();
        display.setEditable( false );
        display.setHorizontalAlignment(JTextField.RIGHT);
        add(display,BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout( new GridLayout(0,5) );
        add(buttonPanel,BorderLayout.CENTER);

        for (int i = 0; i < 10; i++)
        {
            String text = String.valueOf(i);
            JButton button = new JButton( text );
            button.addActionListener( numberAction );
            button.setBorder( new LineBorder(Color.BLACK) );
            button.setPreferredSize( new Dimension(30,30) );
            buttonPanel.add( button );

            InputMap inputMap = buttonPanel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
            inputMap.put(Keystroke.getKeystroke(text),text);
            inputMap.put(Keystroke.getKeystroke("NUMPAD" + text),text);
            buttonPanel.getActionMap().put(text,numberAction);
        }
    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("Calculator Panel");
        frame.setDefaultCloSEOperation( JFrame.EXIT_ON_CLOSE );
        frame.add( new CalculatorPanel() );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }

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