Java Beginner : Strings and Arrays - Display words that start with a vowel in an user inserted string

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package javaapplication7;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
 *
 * @author Sunshine
 */
public class JavaApplication7 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        System.out.println("Please enter some text");
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String names=br.readLine().toLowerCase();
        StringTokenizer stk=new StringTokenizer(names);
        String vowels="";
        while(stk.hasMoreTokens()){
            String c=stk.nextToken();
            if(c.startsWith("a")||c.startsWith("e")||c.startsWith("i")||c.startsWith("o")||c.startsWith("u"))
                vowels=vowels+" "+c;
        }
        System.out.println(vowels);
        
    }
}