请大家为我改一下这个程序，谢谢 啦

//<applet code=Textpane width=300 height=400>
//</applet>
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import javaThink.*;
public class Textpane extends JApplet{
JButton button=new JButton("Addtext");
JTextPane textpane=new JTextPane();
/*........................................*/
static Generator sg=new Arrays2.RandstringGenerator(7);
public void init(){
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
for(int i=1;i<10;i++)
textpane.setText(textpane.getText()+sg.next()

+"\n");
}
});
Container cp=getContentPane();
cp.add(new JScrollPane(textpane));
cp.add(BorderLayout.SOUTH,button);
}
public static void main(String[] args){
Console.run(new Textpane(),300,400);
}
}

----------------解决方案--------------------------------------------------------
javaThink.*是那来的 ?
----------------解决方案--------------------------------------------------------

import javax.swing.*;
import javax.swing.event.*;

import sun.nio.cs.Surrogate.Generator;

import java.awt.*;
import java.awt.event.*;
public class Textpane extends JApplet{
/**
*
*/
private static final long serialVersionUID = 1L;
JButton button=new JButton("Addtext");
JTextPane textpane=new JTextPane();
/*........................................*/
static Generator sg=new Arrays2.RandstringGenerator(7); //在哪？
public void init(){
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
for(int i=1;i<10;i++)
textpane.setText(textpane.getText()+((Object) sg).next()

+"\n");
}
});
Container cp=getContentPane();
cp.add(new JScrollPane(textpane));
cp.add(BorderLayout.SOUTH,button);
}
public static void main(String[] args){
Console.run(new Textpane(),300,400); //这个类也没有啊
}
}

----------------解决方案--------------------------------------------------------
大嘴先生2
import sun.nio.cs.Surrogate.Generator;是什么包?
----------------解决方案--------------------------------------------------------