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

public class FirstButtonFrame extends JFrame implements ActionListener {

    private JPanel panel;

    /* the constructor of this class */
    public FirstButtonFrame() {
        /* JFrame methods */
        setTitle("FirstButtonFrame");
        setLocation(100, 50);
        setSize(250, 100);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        panel = new JPanel();

        JButton butt = new JButton("White");
        panel.add(butt);
        butt.addActionListener(this);
        butt.setActionCommand("Button 1");

        butt = new JButton("Cyan");
        panel.add(butt);
        butt.addActionListener(this);
        butt.setActionCommand("Button 2");

        Container pane = getContentPane();
        pane.add(panel, "North");
    }

    public void actionPerformed(ActionEvent evt) {
        String cmd = evt.getActionCommand();

        System.out.print(cmd + "\t"); // writes cmd and a tab

        if (cmd.equals("Button 1")) {
            doButtonOne();
        } else if (cmd.equals("Button 2")) {
            doButtonTwo();
        } else {
            System.out.println("Any error.");
        }
    }

    private void doButtonOne() {
        System.out.println("is \"White\".");
        panel.setBackground(Color.white);
    }

    private void doButtonTwo() {
        System.out.println("is \"Cyan\".");
        panel.setBackground(Color.cyan);
    }

    /* merely the driver */
    public static void main(String[] args) {
         FirstButtonFrame frame = new FirstButtonFrame();
         frame.show();
    }
}