//  HelloPanelApplication.java  (c) Kari Laitinen

//  http://www.naturalprogramming.com/

//  2012-11-22  File created.
//  2012-11-22  Latest modification.

//  This is a JPanel-based Java application
//  that draws two lines of text to its window.

//  The window that is shown by this application is
//  almost identical to the window opened by HelloApplication.java.


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


class HelloPanel extends JPanel
{
   public void paintComponent( Graphics graphics )
   {
      //  The superclass version of paintComponent() clears the
      //  component area and does other necessary things.

      super.paintComponent( graphics ) ;

      graphics.drawString( "Hello. I am JPanel-based application.", 80, 100 ) ;

      graphics.drawString( "The coordinates of this line are (80,150).",
                           80, 150 ) ;
   }
}


class HelloPanelFrame extends JFrame
{
   static final int FRAME_WIDTH   =  400 ;
   static final int FRAME_HEIGHT  =  280 ;

   public HelloPanelFrame()
   {
      setTitle( "A SIMPLE JPanel-BASED APPLICATION" ) ;
      setSize( FRAME_WIDTH, FRAME_HEIGHT ) ;

      HelloPanel hello_panel = new HelloPanel() ;
      Container content_pane = getContentPane() ;
      content_pane.add( hello_panel ) ;

      setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ) ;
   }
}


public class HelloPanelApplication
{
   public static void main( String[] not_in_use )
   {
      HelloPanelFrame hello_panel_frame = new HelloPanelFrame() ;

      hello_panel_frame.setVisible( true ) ;
   }
}