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| ## Aula 09 - Classes (exercícios II) | ||
| ## Aula 09 - Exercício Music Player | ||
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| Código para um reprodutor de músicas (simulador). | ||
| Solução do exercício proposto durante a aula 09. Veja o enunciado no Moodle. |
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| package music; | ||
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| /** | ||
| * Main class of the application | ||
| * | ||
| * Uncomment the code after you implemented the classes. | ||
| */ | ||
| public class App { | ||
| /** | ||
| * Generate a playlist with some tracks | ||
| * | ||
| * @return the playlist | ||
| */ | ||
| // private static Playlist generatePlaylist() { | ||
| // Playlist playlist = new Playlist("Top 20 Hits Ever"); | ||
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| // public static void simulatePlayer(Player player) { | ||
| // playlist.addTrack(new Track("Bohemian Rhapsody", "Queen", "A Night at the Opera", 1975, new Duration(555))); | ||
| // playlist.addTrack(new Track("Imagine", "John Lennon", "Imagine", 1971, new Duration(217))); // Duration in seconds | ||
| // playlist.addTrack(new Track("What a Wonderful World", "Louis Armstrong", "Satchmo Sings Darin", 1968, new Duration(128))); | ||
| // playlist.addTrack(new Track("Hallelujah", "Leonard Cohen", "Various Positions", 1984, new Duration(240))); | ||
| // playlist.addTrack(new Track("Singin' in the Rain", "Gene Kelly", "Singin' in the Rain", 1952, new Duration(208))); | ||
| // playlist.addTrack(new Track("Back in Black", "AC/DC", "Back in Black", 1980, new Duration(255))); | ||
| // playlist.addTrack(new Track("Billie Jean", "Michael Jackson", "Thriller", 1982, new Duration(334))); | ||
| // playlist.addTrack(new Track("Clair de Lune", "Claude Debussy", "Unknown", 1890, new Duration(280))); | ||
| // playlist.addTrack(new Track("Hey Jude", "The Beatles", "Hey Jude", 1968, new Duration(431))); | ||
| // playlist.addTrack(new Track("Hotel California", "Eagles", "Hotel California", 1976, new Duration(390))); | ||
| // playlist.addTrack(new Track("Lose Yourself", "Eminem", "The Eminem Show", 2002, new Duration(300))); | ||
| // playlist.addTrack(new Track("Respect", "Aretha Franklin", "I Never Loved a Man the Way I Love You", 1967, new Duration(157))); | ||
| // playlist.addTrack(new Track("Light My Fire", "The Doors", "The Doors", 1967, new Duration(428))); | ||
| // playlist.addTrack(new Track("A Whiter Shade of Pale", "Procol Harum", "Procol Harum", 1967, new Duration(249))); | ||
| // playlist.addTrack(new Track("Liège Concerto", "Saint-Saëns", "Unknown", 1913, new Duration(917))); | ||
| // playlist.addTrack(new Track("Somebody That I Used to Know", "Gotye ft. Kimbra", "Making Mirrors", 2011, new Duration(248))); | ||
| // playlist.addTrack(new Track("Can't Stop the Feeling!", "Justin Timberlake", "Trolls", 2016, new Duration(230))); | ||
| // playlist.addTrack(new Track("The Sound of Silence", "Simon & Garfunkel", "Wednesday Morning, 3 A.M.", 1964, new Duration(189))); | ||
| // playlist.addTrack(new Track("The Boxer", "Simon & Garfunkel", "Bridge over Troubled Water", 1970, new Duration(316))); | ||
| // playlist.addTrack(new Track("The Sound of Silence", "Disturbed", "Immortalized", 2015, new Duration(248))); | ||
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| // return playlist; | ||
| // } | ||
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| /** | ||
| * Test the playlist | ||
| * | ||
| * @param playlist the playlist to test | ||
| */ | ||
| // private static void playlistTest(Playlist playlist) { | ||
| // System.out.println("Playlist: " + playlist.getTitle()); | ||
| // System.out.println("Total duration: " + playlist.getDuration() + "s"); | ||
| // System.out.println("Number of tracks: " + playlist.getNumberOfTracks()); | ||
| // System.out.println("String representation: "); | ||
| // System.out.println(playlist); | ||
| // } | ||
|
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| /** | ||
| * Test the player, by calling some methods | ||
| * | ||
| * @param player the player to test | ||
| */ | ||
| // private static void playerTest(Player player) { | ||
| // System.out.println("Current track: " + player.getCurrentTrack().toString()); | ||
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| // player.next(); | ||
| // System.out.println("Next track: " + player.getCurrentTrack().toString()); | ||
| // player.next(); | ||
| // player.next(); | ||
| // player.next(); | ||
| // System.out.println("Next track: " + player.getCurrentTrack().toString()); | ||
| // player.previous(); | ||
| // System.out.println("Previous track: " + player.getCurrentTrack().toString()); | ||
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| // player.shuffle(); | ||
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| // System.out.println("Shuffled queue: "); | ||
| // System.out.println(player.getQueuePlaylist()); | ||
| // } | ||
|
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| /** | ||
| * Simulate the playback of the player, using a thread to simulate the time | ||
| * Due to the limitations of this model, it is not possible to skip the current track | ||
| * while it is playing | ||
| * | ||
| * @param player the player to simulate the playback | ||
| */ | ||
| // private static void simulatePlayback(Player player) { | ||
| // player.play(); | ||
| // while (player.isPlaying()) { | ||
| // System.out.println("Tocando: " + player.getCurrentTrack().toString()); | ||
| // try { | ||
| // Thread.sleep(player.getCurrentTrack().getDuration() * 10); | ||
| // /** | ||
| // * Simulate the time of the track by using a thread sleep | ||
| // * The sleep method only accepts milliseconds, but the track duration is in seconds. | ||
| // * We multiply by 10 to simulate a faster playback and see the results faster | ||
| // * (the correct would be to muliply by 1000 to get the correct time) | ||
| // */ | ||
| // Thread.sleep(player.getCurrentTrack().getDuration().getSeconds() * 10); | ||
| // } catch (InterruptedException e) { | ||
| // e.printStackTrace(); | ||
| // } | ||
| // if (player.getQueuePlaylist().getNumberOfTracks() == 0) { | ||
| // player.stop(); | ||
| // } else { | ||
| // player.nextTrack(); | ||
| // player.next(); | ||
| // } | ||
| // } | ||
| // } | ||
|
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| /** | ||
| * Start one of the main methods of the application | ||
| * @param args | ||
| */ | ||
| public static void main(String[] args) { | ||
| // Player player = new Player(); | ||
| // Playlist playlist = new Playlist("Top 20 Hits Ever"); | ||
|
|
||
| // playlist.addTrack(new Track("Bohemian Rhapsody", "Queen", "A Night at the Opera", 1975, 555)); | ||
| // playlist.addTrack(new Track("Imagine", "John Lennon", "Imagine", 1971, 217)); // Duration in seconds | ||
| // playlist.addTrack(new Track("What a Wonderful World", "Louis Armstrong", "Satchmo Sings Darin", 1968, 128)); | ||
| // playlist.addTrack(new Track("Hallelujah", "Leonard Cohen", "Various Positions", 1984, 240)); | ||
| // playlist.addTrack(new Track("Singin' in the Rain", "Gene Kelly", "Singin' in the Rain", 1952, 208)); | ||
| // playlist.addTrack(new Track("Back in Black", "AC/DC", "Back in Black", 1980, 255)); | ||
| // playlist.addTrack(new Track("Billie Jean", "Michael Jackson", "Thriller", 1982, 334)); | ||
| // playlist.addTrack(new Track("Clair de Lune", "Claude Debussy", "Unknown", 1890, 280)); | ||
| // playlist.addTrack(new Track("Hey Jude", "The Beatles", "Hey Jude", 1968, 431)); | ||
| // playlist.addTrack(new Track("Hotel California", "Eagles", "Hotel California", 1976, 390)); | ||
| // playlist.addTrack(new Track("Lose Yourself", "Eminem", "The Eminem Show", 2002, 300)); | ||
| // playlist.addTrack(new Track("Respect", "Aretha Franklin", "I Never Loved a Man the Way I Love You", 1967, 157)); | ||
| // playlist.addTrack(new Track("Light My Fire", "The Doors", "The Doors", 1967, 428)); | ||
| // playlist.addTrack(new Track("A Whiter Shade of Pale", "Procol Harum", "Procol Harum", 1967, 249)); | ||
| // playlist.addTrack(new Track("Liège Concerto", "Saint-Saëns", "Unknown", 1913, 917)); | ||
| // playlist.addTrack(new Track("Somebody That I Used to Know", "Gotye ft. Kimbra", "Making Mirrors", 2011, 248)); | ||
| // playlist.addTrack(new Track("Can't Stop the Feeling!", "Justin Timberlake", "Trolls", 2016, 230)); | ||
| // playlist.addTrack(new Track("The Sound of Silence", "Simon & Garfunkel", "Wednesday Morning, 3 A.M.", 1964, 189)); | ||
| // playlist.addTrack(new Track("The Boxer", "Simon & Garfunkel", "Bridge over Troubled Water", 1970, 316)); | ||
| // playlist.addTrack(new Track("The Sound of Silence", "Disturbed", "Immortalized", 2015, 248)); | ||
| // Playlist playlist = generatePlaylist(); | ||
| // playlistTest(playlist); | ||
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| // player.addPlaylist(playlist); | ||
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| // System.out.println("Fila de reprodução: "); | ||
| // System.out.println(player.getQueuePlaylist()); | ||
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| // player.shuffle(); | ||
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| // System.out.println("Fila de reprodução: "); | ||
| // System.out.println(player.getQueuePlaylist()); | ||
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| // player.play(); | ||
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| // System.out.println("Música atual: " + player.getCurrentTrack().toString()); | ||
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| // player.nextTrack(); | ||
| // System.out.println("Próxima música: " + player.getCurrentTrack().toString()); | ||
| // player.nextTrack(); | ||
| // player.nextTrack(); | ||
| // player.nextTrack(); | ||
| // System.out.println("Próxima música: " + player.getCurrentTrack().toString()); | ||
| // player.previousTrack(); | ||
| // System.out.println("Música anterior: " + player.getCurrentTrack().toString()); | ||
| // // playerTest(player); | ||
| // simulatePlayback(player); | ||
| } | ||
| } |
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| package music; | ||
|
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| /** | ||
| * Represents a duration in seconds. | ||
| * This is an immutable object, because the duration should not change. | ||
| */ | ||
| public class Duration { | ||
| private final int duration; | ||
|
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| /** | ||
| * Creates a new duration | ||
| * | ||
| * @param duration the duration in seconds | ||
| * @throws IllegalArgumentException if the duration is negative | ||
| */ | ||
| public Duration(int duration) { | ||
| if (duration < 0) { | ||
| throw new IllegalArgumentException("Invalid duration"); | ||
| } | ||
| this.duration = duration; | ||
| } | ||
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| /** | ||
| * Gets the duration in seconds | ||
| * | ||
| * @return the duration in seconds | ||
| */ | ||
| public int getSeconds() { | ||
| return duration; | ||
| } | ||
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| /** | ||
| * Add a duration to the current duration | ||
| * | ||
| * @param duration the duration to be added | ||
| * @return a new duration with the sum of the durations | ||
| */ | ||
| public Duration add(Duration duration) { | ||
| return new Duration(this.duration + duration.getSeconds()); | ||
| } | ||
|
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| /** | ||
| * Show the duration in the format (hh:mm:ss) | ||
| */ | ||
| public String toString() { | ||
| int hours = duration / 3600; | ||
| int minutes = (duration % 3600) / 60; | ||
| int seconds = duration % 60; | ||
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| return String.format("%02d:%02d:%02d", hours, minutes, seconds); | ||
| } | ||
| } |
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