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

public class HelloJava3
{
  public static void main( String[] args ) {
    JFrame frame = new JFrame( "HelloJava3" );
    frame.add( new HelloComponent3("Hello Java!") );
	frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.setSize( 300, 300 );
    frame.setVisible( true );
  }
}

class HelloComponent3 extends JComponent 
	implements MouseMotionListener, ActionListener
{
  String theMessage;
  int messageX = 125, messageY = 95;  // Coordinates of the message

  JButton theButton;

  int colorIndex;  // Current index into someColors
  static Color[] someColors = { 
	Color.black, Color.red, Color.green, Color.blue, Color.magenta };

  public HelloComponent3( String message ) {
    theMessage = message;
    theButton = new JButton("Change Color");
    setLayout( new FlowLayout() );
    add( theButton );
    theButton.addActionListener( this );
    addMouseMotionListener( this );
  }

  public void paintComponent( Graphics g ) {
    g.drawString(theMessage, messageX, messageY);
  }

  public void mouseDragged( MouseEvent e ) {
    messageX = e.getX();
    messageY = e.getY();
    repaint();
  }

  public void mouseMoved( MouseEvent e ) {}

  public void actionPerformed( ActionEvent e ) {
    // Did somebody push our button?
    if (e.getSource() == theButton)
      changeColor();
  }

  synchronized private void changeColor() {
    // Change the index to the next color, awkwardly.
    if (++colorIndex == someColors.length)
      colorIndex = 0;
    setForeground(currentColor(  )); // Use the new color.
    repaint(  ); // Paint again so we can see the change.
  }

  synchronized private Color currentColor() {
    return someColors[colorIndex];
  }
}