accept sentence from user and print all word starts with vowel and end with consonent

Java accept sentence from user and print all word starts with vowel and end with consonant

import java.util.*;
class StringExample6 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter string:");
        String str=input.nextLine();
        StringTokenizer stk=new StringTokenizer(str);
        String vowels="",consonants="";
        while(stk.hasMoreTokens()){
            String token=stk.nextToken();
            if(token.startsWith("a")||token.startsWith("e")||token.startsWith("i")||token.startsWith("o")||token.startsWith("u")){
            vowels+=token+" ";
            }
            else if(!token.startsWith("a")||!token.startsWith("e")||!token.startsWith("i")||!token.startsWith("o")||!token.startsWith("u")){
            consonants+=token+" ";
            }
        }
        System.out.println("Second Output: "+vowels.concat(consonants));
    }
}