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

public class ControlCircle2 extends JFrame {
  private JButton jbtEnlarge = new JButton("Enlarge");
  private JButton jbtShrink = new JButton("Shrink");
  private CirclePanel canvas = new CirclePanel();
  
  public ControlCircle2() {
    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 
    
    jbtEnlarge.addActionListener(new Listener());
    jbtShrink.addActionListener(new Listener());
  }
  
  /** Main method */
  public static void main(String[] args) {
    JFrame frame = new ControlCircle2();
    frame.setTitle("ControlCircle2");
    frame.setLocationRelativeTo(null); // Center the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
  
  class Listener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      System.out.println(new java.util.Date(e.getWhen()));
      if (e.getSource() == jbtEnlarge)
        canvas.enlarge();
      else if (e.getSource() == jbtShrink)
    	canvas.shrink();
    }
  }
  

  
  class CirclePanel extends JPanel {
    private int radius = 5; // Default circle radius
      
    /** Enlarge the circle */
    public void enlarge() {
      radius++;
      repaint();
    }
    
    /** Enlarge the circle */
    public void shrink() {
      radius--;
      repaint();
    }
    
    /** Repaint the circle */
    protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      g.drawOval(getWidth() / 2 - radius, getHeight() / 2 - radius, 
        2 * radius, 2 * radius);
    }
  }   
}