NoClassDefFoundError

Hi. I have a simple programme:

package WXY;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.FileWriter;

publicclass VSM{

publicstaticvoid main(String[] args)throws FileNotFoundException,

IOException{

BufferedReader in =new BufferedReader(new FileReader(

"C:\\word.txt"));

String word;

word = in.readLine();

in.close();

PrintWriter writer =new PrintWriter(new FileWriter ("C:\\result.txt"));

writer.println(word);

writer.close();

}

}

But when I run it in textpad or using command line, it will throw Exception in thread "main" java.lang.NoClassDefFoundError.

How to slove the problem?

[1567 byte] By [Wenxiaoa] at [2007-10-2 13:29:08]