A Circle component built using a Canvas

import java.awt.*;

/** A Circle component built using a Canvas. 
 *
  */

public class Circle extends Canvas {
  private int width, height;        
        
  public Circle(Color foreground, int radius) {
    setForeground(foreground);
    width = 2*radius;
    height = 2*radius;
    setSize(width, height);
  }

  public void paint(Graphics g) {
    g.fillOval(0, 0, width, height);
  }

  public void setCenter(int x, int y) {
    setLocation(x - width/2, y - height/2);
  }
}