> 
> what is wrong??
> 
> //code
> import java.io.*;
> import java.util.*;
> 
> class Main{
> 
> static boolean validCodeC(char a[])
> {
> 
> int i;
> 	
> for(i=0;i<a.length;i++)
>     if(Character.isUpperCase(a[i]))break;
>     
>     	
> 	
> return (i==a.length);	
> 
> }
> 
> static boolean validCodeJ(char a[])
> {
> 
> int i;
> 	
> for(i=0;i<a.length;i++)
>     if(Character.isUpperCase(a[i]))break;
>     
>     	
> 	
> return (i<a.length);	
> 
> }
> 	
> public static void main(String args[])throws IOException{
> 	
> BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
> //BufferedReader br = new BufferedReader(new FileReader("in.txt"));
> StringBuffer s=new StringBuffer ();
> ArrayList<Character>array;
> 
> StringTokenizer st;
> String linea;
> char codigo[];
> int i,caso=1,tokens;	
> 
> //try{	
> 
> while((linea=br.readLine())!=null)
> {
> 
> s.append("sample output #"+(caso++)+"\n");
> 
> st=new StringTokenizer((linea=br.readLine().trim()),"_");
> tokens=0;
> array=new ArrayList<Character>();
> 
> while(st.hasMoreTokens())
> {
> 	st.nextToken();
> 	tokens++;
> }
> 
> codigo=linea.toCharArray();
> 
> if(tokens==1){
> 
> 
> 
> if(validCodeJ(codigo))
> {
> for(i=0;i<codigo.length;i++)	
> if(Character.isUpperCase(codigo[i]))
> s.append("_"+Character.toLowerCase(codigo[i]));	
> else s.append(codigo[i]);	
> } else s.append(linea);
> }
> 
> else
> {
> 
> if(validCodeC(codigo))
> {
> 
> for(i=0;i<codigo.length;i++)
>  array.add(codigo[i]);
>  
>  for(i=0;i<array.size();i++)
>    if(array.get(i)=='_'){
>   	array.remove(i);
>   	array.set(i,Character.toUpperCase(array.get(i)));
>    }
>   	
>   	for(i=0;i<array.size();i++)
>   	s.append(array.get(i));
> 
> }else s.append("Error!");
> 
> 
> 
> }
> 
> br.readLine();
> s.append("\n\n");
> 
> 
> 	
> 
> }
> System.out.println(s);
> //}catch(IOException e){}
> }
> }
>