debug15_2.java

北京大学出版社的

package questions.c15;
import javax.swing.JPanel;
import java.awt.*;
public class Debug15_2 extends JPanel {
   private String radius = "25";
   private static final Point START = new Point( 20, 20 );
   public void radius( String radius ) {
      this.radius = radius;
   }
   public String radius() {
      return radius;
   }
   public Dimension getPreferredSize() {
      return new Dimension( 100, 100 );
   }
   public void paintComponent( Graphics g ) {
      super.paintComponent( g );
      int r = Integer.parseInt( radius );
      g.fillOval( START.x, START.y, r, r );
   }
}