[Ch10c] Test for ordering by least played. (1c1924da) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch10c/JukeboxData.java

+15 −19

Changes for src/main/java/ch10c/JukeboxData.java: 15 added lines, 19 removed lines.
Original line number	Diff line number	Diff line
		@@ -43,26 +43,22 @@ public class JukeboxData {


		public static void main(String[] args) {
		// Songs songs = new Songs();
		// List<Song> songList = songs.getSongs();
		//
		// // ORDER MATTERS
		// List<String> genres = songList.stream().map(song -> song.getGenre())
		// .distinct()
		// .collect(toList());
		// System.out.println("genres = " + genres);
		//
		// System.out.println(songList.stream().map(song -> song.getGenre())
		// .distinct()
		// .count());
		//
		// Map<String, Long> genreCount = songList.stream().map(song -> song.getGenre())
		// .collect(groupingBy(Function.identity(), counting()));
		// System.out.println("genreCount = " + genreCount);
		for (int i = 0; i < 23; i++) {
		Songs songs = new Songs();
		List<Song> songList = songs.getSongs();

		System.out.println(((int) (Math.random() * 500)));
		}
		// ORDER MATTERS
		List<String> genres = songList.stream().map(song -> song.getGenre())
		.distinct()
		.collect(toList());
		System.out.println("genres = " + genres);

		System.out.println(songList.stream().map(song -> song.getGenre())
		.distinct()
		.count());

		Map<String, Long> genreCount = songList.stream().map(song -> song.getGenre())
		.collect(groupingBy(Function.identity(), counting()));
		System.out.println("genreCount = " + genreCount);
		}

		}

+4 −0

Changes for src/main/java/ch10c/Song.java: 4 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		@@ -17,6 +17,10 @@ public class Song {
		this.timesPlayed = timesPlayed;
		}

		public int getTimesPlayed() {
		return timesPlayed;
		}

		public String getTitle() {
		return title;
		}

+9 −9

Changes for src/test/java/ch10c/JukeboxV3Test.java: 9 added lines, 9 removed lines.
Original line number	Diff line number	Diff line
		@@ -24,14 +24,14 @@ class JukeboxV3Test {

		@Test
		void shouldOrderByLeastPlayed() {
		// this is impossible!!!!
		// back to square one
		// List<Song> result = log.stream()
		// .map(logEntry -> songs.getSongById(logEntry.id))
		// .sorted(Comparator.comparingInt())
		// .collect(Collectors.toList());
		//
		// System.out.println(result);
		//
		List<Song> allSongs = songs.getSongs();

		List<Song> result = allSongs.stream()
		.sorted(Comparator.comparingInt(Song::getTimesPlayed))
		.collect(Collectors.toList());

		System.out.println(result);
		}


		}
		No newline at end of file