import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class FrontEnd extends JFrame {

	public FrontEnd() {
		Image miniIcon = new ImageIcon("icon.gif").getImage();
		this.setIconImage(miniIcon);
		MainScreen mainScr = new MainScreen();
		add(mainScr);
		mainScr.repaint();
	}

	public static void main(String args[]) {
		FrontEnd window = new FrontEnd();
		window.setTitle("Blah");
		window.setSize(400, 400);
		window.setLocationRelativeTo(null);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.setVisible(true);

	}

}

//#####################################################################################################

class MainScreen extends JPanel {

	public MainScreen() {

		JPanel p = new JPanel(new GridLayout(1, 1, 0, 0));
		System.out.println("Container panel created");

		Image image = new ImageIcon("icon.gif").getImage();
		ImageViewer viewPanel = new ImageViewer(image);
		add(viewPanel);
		viewPanel.repaint();		

	}
	
	protected void paintComponent(Graphics g) {
		ImageViewer.repaint();
		System.out.println("The main screen is redrawn");
	}
	
	
}

//#####################################################################################################

class ImageViewer extends JPanel {

	private java.awt.Image image;

	public ImageViewer(Image image) {
		this.image = image;	
		System.out.println("ImageViewer constructor called");
	}

	protected void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.drawImage(image, 0, 0, this);
		System.out.println("ImageViewer paintComponent called");
	}

}

    protected void paintComponent(Graphics g) {
        ImageViewer.repaint();
        System.out.println("The main screen is redrawn");
    }