关于Applet，求救！！！在线等！！！

Question

你自己的代码：//conPane.setLayout(new GridLayout(2,1));//更改此处
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
/*
<applet code=test.class codebase=F:/j/ width=200 height=300 >
</applet>
*/
public class Test extends JApplet implements ListSelectionListener
{
JList lt;
JList lt2;
Container conPane;
JScrollPane jsp2;
JScrollPane jsp;
public void init()
{
conPane=getContentPane();
String[] items=new String[12];

for(int i=0; i<11; i++)
items[i]=i+"";

lt=new JList(items);
lt2=new JList(items);

jsp=new JScrollPane(lt);
lt.setVisibleRowCount(5);
lt.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
lt.addListSelectionListener(this);

jsp2=new JScrollPane(lt2);
lt2.setVisibleRowCount(5);
lt2.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
lt2.addListSelectionListener(this);

conPane.setLayout(new GridLayout(2,1));//更改此处
conPane.add(jsp);
conPane.add(jsp2);
jsp2.setVisible(false);
}

public void valueChanged(ListSelectionEvent e)
{
int[] index=lt.getSelectedIndices();
String[] items=new String[12];

jsp2.setVisible(true);
}
}