Agfdhyk

I've implemented a JFrame with 25 JButton components to represent the available rooms in a hotel. I do know this is not the whole program but how can I create a method in which when pressed the color changes?

The colors for available rooms is green and I would like to change them to red.

This code uses a JToggleButton with different colored icons for standard & selected states. A JCheckBox might also be used.

import java.awt.*;

import javax.swing.*;

import javax.swing.border.EmptyBorder;

import java.net.*;

import java.util.*;



public class RoomReservationToggle {



    private JComponent ui = null;

    private String reservedPath = "https://i.stack.imgur.com/xj49g.png";

    private String freePath = "https://i.stack.imgur.com/zJ8am.png";



    RoomReservationToggle() {

        try {

            initUI();

        } catch (MalformedURLException ex) {

            ex.printStackTrace();

        }

    }



    public void initUI() throws MalformedURLException {

        if (ui != null) {

            return;

        }

        ui = new JPanel(new GridLayout(0, 4, 4, 4));

        ui.setBorder(new EmptyBorder(4, 4, 4, 4));



        ImageIcon reservedIcon = new ImageIcon(new URL(reservedPath));

        ImageIcon freeIcon = new ImageIcon(new URL(freePath));



        Random r = new Random();

        for (int ii = 1; ii < 17; ii++) {

            // a JCheckBox might also be used

            JToggleButton tb = new JToggleButton(freeIcon, r.nextBoolean());

            tb.setSelectedIcon(reservedIcon);

            ui.add(tb);

        }

    }



    public JComponent getUI() {

        return ui;

    }



    public static void main(String args) {

        Runnable r = new Runnable() {

            @Override

            public void run() {

                try {

                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

                } catch (Exception useDefault) {

                }

                RoomReservationToggle o = new RoomReservationToggle();



                JFrame f = new JFrame(o.getClass().getSimpleName());

                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

                f.setLocationByPlatform(true);



                f.setContentPane(o.getUI());

                f.pack();

                f.setMinimumSize(f.getSize());



                f.setVisible(true);

            }

        };

        SwingUtilities.invokeLater(r);

    }

}

You can use the methods setForeground() and setBackground() to change colours.

Make sure you call these methods from the event thread/queue.

Your configured L&F can ignore these however. Sometimes calling setOpaque(true) might help in those cases.