HI
this is my program. How should I improve on timing.

import java.util.Scanner;
 /* @author nitiraj
 */
import java.util.* ;
import java.io.* ;

public class Q1001
{

    /** Creates a new instance of Q2 */
    public Q1001()
    {
    }

    public static void main( String args[] ) throws IOException
    {
        BufferedReader bi = new BufferedReader( new InputStreamReader( System.in ) ) ;
        String input ;
        String str = "" ;
        StringTokenizer st ;
        while( ( input = bi.readLine() )!= null )
         {
             st = new StringTokenizer( input ) ;
             while( st.hasMoreTokens() )
             {
                 String temp = st.nextToken() ;
                 str = temp.concat( "\n" ).concat( str ) ;
             }
         }

         st = new StringTokenizer( str ) ;
         double d ;

          while( st.hasMoreTokens() )
          {
              d = Double.parseDouble( st.nextToken() ) ;
              System.out.printf( "%.6f\n" , Math.sqrt(d ) ) ;
          }

      }
}

CAN WE GET THE TEST CASES WHICH THEY USE FOR THERE TESTING

Please tell

thanks
Bye
Nitiraj