import java.io.*;
import java.util.*;
import java.net.*;

public class StringChooser 
{
    private static Randomizer rzer = new Randomizer(System.currentTimeMillis());
    //private static Randomizer rzer = new Randomizer();

    public static String chooseLine (String filename)
    {
        try {
            /* Applets generally can't open files on a machine (for security reasons).
             * To achieve this, we have to send the IP (which matches that of the
             * code source.
             */
            URL source = new URL(filename);
            BufferedReader br = new BufferedReader(new InputStreamReader(source.openStream()));

            StreamTokenizer st = new StreamTokenizer(br);
            st.wordChars('\u0000', '\u00FF');
            st.whitespaceChars('\n', '\n'); // newline char; ((int) '\n') == 10 
            st.whitespaceChars('\r', '\r'); // carriage return char; ((int) '\r') == 13
            Vector v = new Vector();
            while (! (st.nextToken() == StreamTokenizer.TT_EOF)) {
                v.addElement(st.sval);
            }
            return (String) (v.elementAt(rzer.intBetween(0,v.size() - 1)));
        } catch (MalformedURLException e) {
            //System.out.println("*** StringChoooser Error: File Not Found "
            //+ filename
            //+ " ***");
            throw new RuntimeException("File Not Found: " +  filename);
        } catch (SecurityException e) {
            //System.out.println("*** StringChoooser Error: File Not Found "
            //+ filename
            //+ " ***");
            throw new RuntimeException("Lacking security permission to open file");
        } catch (IOException e) {
            //System.out.println("*** StringChoooser Error: IO Exception in file "
            //+ filename
            //+ "\n"
            //+ e.getMessage()
            //+ " ***");
            throw new RuntimeException("IO Exception: " +  e.getMessage());
        }
    }
}