Creating different kinds of Stream sources in Java

JavaStreams.java

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Sources {
    public static void main(String[] args) throws IOException {
        // Collections
        Stream<String> typesOfFruits = List.of(
                "apple", "banana", "clementine", "dragonfruit"
        ).stream();

        // I/O
        Stream<String> lines = Files.lines(Path.of("my-fruit-list.txt"));

        // Generators
        Random random = new Random();
        Stream<Integer> randomNumbers = Stream.generate(random::nextInt);

        // -----------------------
        // Intermediate operations
        // -----------------------

        // Same length: returns a Stream of "APPLE", "BANANA", "CLEMENTINE", "DRAGONFRUIT"
        typesOfFruits.map(String::toUpperCase);

        // Shorter: this returns a Stream of "clementine", "dragonfruit"
        typesOfFruits.filter(fruit -> fruit.length() > 7);

        // Longer: returns a Stream of "a", "p", "p", "l", "e", "b", "a" ...
        typesOfFruits.flatMap(fruit -> Stream.of(fruit.split("")));

        // These operations return a Stream of all the letters in the fruit names which
        // are after "G" in the alphabet, uppercased: "P", "P", "L", "N"...
        typesOfFruits
                .map(String::toUpperCase)
                .flatMap(fruit -> Stream.of(fruit.split("")))
                .filter(s -> s.compareTo("G") > 0);

        // -------------------
        // Terminal operations
        // -------------------

        // Collecting the Stream elements into a List
        List<String> fruitList = typesOfFruits.collect(Collectors.toList());

        // Doing something with each element of the Stream
        typesOfFruits.forEach(System.out::println);

        // How many elements are in the Stream?
        long fruitCount = typesOfFruits.count();
    }
}