Generate a list of random words in Java

import java.io.BufferedReader; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.util.Collections; import java.util.List; import java.util.Random; import java.util.stream.Collectors; import java.util.stream.Stream; /** * Class to generate a list of random words. Oracle JDK 8 MOOC Lesson2 homework * * @author cesarnog */ public class RandomWords { private final List<String> sourceWords; private static final String WORD_REGEXP = "[- .:,]+"; /** * Constructor * * @throws IOException * If the source words file cannot be read */ public RandomWords() throws IOException { try (BufferedReader reader = Files.newBufferedReader(Paths.get("words.txt"))) { sourceWords = reader.lines().flatMap(line -> Stream.of(line.split(WORD_REGEXP))) .collect(Collectors.toList()); System.out.println("Loaded " + sourceWords.size() + " words"); } } /** * Create a list of a given size containing random words * * @param listSize * The size of the list to create * @return The created list */ public List<String> createList(int listSize) { List<String> wordList = Collections.emptyList(); if (listSize > 0) { Random rand = new Random(System.currentTimeMillis()); wordList = rand.ints(listSize, 0, sourceWords.size()).mapToObj(i -> sourceWords.get(i)) .collect(Collectors.toList()); } return wordList; } /** * Return the list of all source words, which cannot be modified * * @return The unmodifiable list of all source words */ public List<String> allWords() { return Collections.unmodifiableList(sourceWords); } }