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

public class ControlCircle1 extends JFrame {
  private JButton jbtEnlarge = new JButton("Enlarge");
  private JButton jbtShrink = new JButton("Shrink");
  private CirclePanel canvas = new CirclePanel();
  
  public ControlCircle1() {
    JPanel panel = new JPanel(); // Use the panel to group buttons
    panel.add(jbtEnlarge);
    panel.add(jbtShrink);
    
    this.add(canvas, BorderLayout.CENTER); // Add canvas to center
    this.add(panel, BorderLayout.SOUTH); // Add buttons to the frame   
  }
  
  /** Main method */
  public static void main(String[] args) {
    JFrame frame = new ControlCircle1();
    frame.setTitle("ControlCircle1");
    frame.setLocationRelativeTo(null); // Center the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}
  
class CirclePanel extends JPanel {
  private int radius = 5; // Default circle radius
    
  /** Repaint the circle */
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawOval(getWidth() / 2 - radius, getHeight() / 2 - radius, 
      2 * radius, 2 * radius);
  }
}