// Example of a hierarchical layout

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

public class Hierarchies extends JFrame {


    // The panel into which we draw things

    class DrawingPanel extends JPanel {

	DrawingPanel() {
	    setPreferredSize( new Dimension( 400, 200 ) );
	}

	protected void paintComponent(Graphics g) {
	    super.paintComponent(g);
	    g.setColor( Color.RED );
	    g.fillOval( 10, 10, getWidth()-20, getHeight()-20 );
	}
    }
    

    // The constructor for this JFrame

    Hierarchies() {

	super();

	// A panel for all the buttons

	JPanel buttonPanel = new JPanel();
	buttonPanel.setLayout( new FlowLayout() );

	for (int i=0; i<10; i++) {
	    JButton button = new JButton( "button " + i );
	    buttonPanel.add( button );
	}

	// A panel for drawing

	DrawingPanel drawingPanel = new DrawingPanel();

	// The JFrame

	Container cp = getContentPane();
	cp.setLayout( new BorderLayout() );
	cp.add( drawingPanel, BorderLayout.CENTER );
	cp.add( buttonPanel,  BorderLayout.SOUTH );

        pack();
        requestFocus();
        setVisible(true);
    }


    // Test program

    public static void main( String [] args ) {
	Hierarchies hier = new Hierarchies();
    }
}