Ｊａｖａで九九の表

package shukudai;

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

public class Syukudai extends JFrame {
    private static final long serialVersionUID = 1L;

    public Syukudai() throws MalformedURLException {
        getContentPane().add(new PictureBox());
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("宿題は俺に任せろ");
        setResizable(false);
        pack();
    }

    public static void main(String[] args) throws MalformedURLException {
        Syukudai s = new Syukudai();
        s.setVisible(true);
    }
    
    class PictureBox extends JPanel {
        private static final long serialVersionUID = 1L;
        private Image image;

        public PictureBox() throws MalformedURLException {
            image = Toolkit.getDefaultToolkit().getImage(
                    new URL("http://ind.at.infoseek.co.jp/other/99.png"));
            MediaTracker mt = new MediaTracker(this);
            mt.addImage(image, 0);
            try {
                mt.waitForAll();
            } catch (InterruptedException e) {
            }
            Dimension d = new Dimension(image.getWidth(this), image.getHeight(this));
            setPreferredSize(d);
        }
        public void paint(Graphics g) {
            g.drawImage(image, 0, 0, image.getWidth(this), image.getHeight(this), getBackground(), this);
        }
    }
}