皮囊炎图片:谁能帮我看一下这个java程序

我在eclipse环境下敲了一个课本上的范例，可是没出现课本所述的结果，清高手帮忙解释一下。程序如下：
package package1;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

class Mywindow2 extends JFrame
{
JButton button1;
JButton button2;
JInternalFrame interframe_1;
JInternalFrame interframe_2;

Mywindow2()
{
setSize(200, 200);
setVisible(true);
Container con = getContentPane();
con.setLayout(new GridLayout(1, 2));
button1 = new JButton("Boy");
button2 = new JButton("Girl");
interframe_1 = new JInternalFrame("内窗体1", true, true, true, true);
interframe_1.setSize(100, 100);
interframe_1.getContentPane().add(button1);
JDesktopPane desk1 = new JDesktopPane();
desk1.add(interframe_1);
interframe_2 = new JInternalFrame("内窗体2", true, true, true, true);
interframe_2.setSize(300, 150);
interframe_2.getContentPane().add(button2, BorderLayout.CENTER);
interframe_2.getContentPane().add(new JLabel("ok"), BorderLayout.NORTH);
JDesktopPane desk2 = new JDesktopPane();
desk2.add(interframe_2);

con.add(desk1);
con.add(desk2);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});

}
}

public class Example25_9
{

/**
* @param args
*/
public static void main(String[] args)
{
// TODO 自动生成方法存根
Mywindow2 win = new Mywindow2();
win.pack();

}

}
急用！