Listing 2. Prob03 class definition.
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Color;

public class Prob03{
  public static void main(String[] args){
    new Prob03Runner().run();
  }//end main method
}//end class Prob03