Can we create GUI for standalone application using html and javascript?

Question

I have a Java program which until now used to get the input from command line and then proceed accordingly.

Now, I want to have a basic GUI for this. It will need a

Answer 1

I want to have a basic GUI for this. It will need a few buttons which will trigger the events.

This 'basic GUI' goes slightly beyond the spec. to add an output area.

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

class SimpleEventGUI {

    SimpleEventGUI() {
        JPanel gui = new JPanel(new BorderLayout());
        JToolBar toolBar = new JToolBar();
        for (int ii=1; ii<6; ii++) {
            toolBar.add(new JButton("Event " + ii));
            if (ii%2==0) {
                toolBar.addSeparator();
            }
        }
        gui.add(toolBar, BorderLayout.NORTH);
        gui.add( new JScrollPane(new JTextArea(5,30)), BorderLayout.CENTER );

        JOptionPane.showMessageDialog(null, gui);
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SimpleEventGUI();
            }
        });
    }
}