Splitter.java

package com.plateauu.abstractTest;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;

class Splitter {

    private static List<String> vowels = Arrays.asList("a", "e", "y", "u", "i", "o");

    public static void main(String[] args) {

        String fileString = System.getProperty("user.dir") + "/src/com/plateauu/abstractTest/txt.txt";

        try (Stream<String> stream = Files.lines(Paths.get(fileString))) {

            stream
                    .flatMap(s -> Stream.of(s.split("\\s")))
                    .filter(Splitter::hasFiveVowels)
                    .forEach(s -> System.out.println(" " + s + " "));

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static boolean hasFiveVowels(String word) {

        List<Character> wordLetters = new ArrayList<>();

        for(int i = 0; i < word.length(); i++) {
            wordLetters.add(word.charAt(i));
        }

        long count = wordLetters
                .stream()
                .filter(o -> vowels.contains(o.toString()))
                .distinct()
                .count();

        return count > 4;
    }
}