import javax.swing.JApplet;
import javax.swing.JButton;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
 Simple demonstration of adding buttons to an applet.
 These buttons do something when clicked.
*/
public class ButtonDemo extends JApplet implements ActionListener
{

    public void init( )
    {
        Container contentPane = getContentPane( );
        contentPane.setBackground(Color.WHITE);

        contentPane.setLayout(new FlowLayout( ));

        JButton sunnyButton = new JButton("Sunny");
        contentPane.add(sunnyButton);
        sunnyButton.addActionListener(this);

        JButton cloudyButton = new JButton("Cloudy");
        contentPane.add(cloudyButton);
        cloudyButton.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e)
    {
       Container contentPane = getContentPane( );

       if (e.getActionCommand( ).equals("Sunny"))
           contentPane.setBackground(Color.BLUE);
       else if (e.getActionCommand( ).equals("Cloudy"))
           contentPane.setBackground(Color.GRAY);
       else
           System.out.println("Error in button interface.");
    }
}