// OvalPanel.java
// Customized JPanel class
import java.awt.*;
import javax.swing.*;

public class OvalPanel extends JPanel {
	private int dia = 10;

	public void paintComponent( Graphics g ) {
		super.paintComponent( g );	// delete this to keep JPanel from clearing background but gives unexpected results
		g.fillOval( 10, 10, dia, dia );
	}

	public void setDiameter( int d ) {
		dia = ( d >= 0 ? d : 10 );	// default value is 10
		repaint( );
	}

	// following methods are used by layout managers
	public Dimension getPreferredSize( ) {
		return new Dimension( 200, 200 );
	}

	public Dimension getMinimumSize( ) {
		return getPreferredSize( );
	}
}