import java.awt.*;

import java.awt.event.*;

import javax.swing.*;


public class ButtonTest extends CloseableFrame implements ActionListener

  { public ButtonTest()

      { // build the user interface

        setLayout(new BorderLayout());

        Panel p = new Panel();

        JButton yellowButton = new JButton("Yellow");

        p.add(yellowButton);

        yellowButton.addActionListener(this);



        JButton blueButton = new JButton("Blue");

        p.add(blueButton);

        blueButton.addActionListener(this);



        add(p,"South");



        ta = new JTextArea(3,20);

        add(ta,"North"); 

      }

    public void actionPerformed(ActionEvent evt)

      { String arg = evt.getActionCommand();

        Color  color = Color.black;

        if (arg.equals("Yellow")) color = Color.yellow;

        else if (arg.equals("Blue")) color = Color.blue;

        setBackground(color);

        repaint();

      }

    public static void main(String[] args)

      { Frame f = new ButtonTest();

        f.show();

      }



  private JTextArea ta;

  }