java播放列表中的歌曲构造函数

我目前正在制作一个使用Java的播放列表软件。我想Song来自一个文件，并将其存储在播放列表中。我是否应该在我的歌班中放些东西来表明它应该来自文件？我错过了什么？请回答我。

public class Song { 
    private Float playTime; 
    private String songName; 
    private String artist; 

    //getters 
    public Float getPlayTime() { return playTime; } 
    public String getSongName() { return songName; } 
    public String getArtist() { return artist; } 
}

下面是我的播放列表类。（不是我的，我把它放在网上的某个地方。）

public class Playlist { 

    //Instance variable 
    private List<Song> songs; //arraylist of songs 
    private String playlistName; //Playlist name 

    public Playlist(String name) { 
     songs = new ArrayList<Song>(); //initalize Arraylist to hold Song type 
     playlistName = name; 
    } 

    //Methods: 

    //Returns the playlist name 
    public String playlistName() { 
     return playlistName; 
    } 

    //adds Song s to Playlist 
    public boolean addSong(Song s) { 
     return songs.add(s); 
    } 

    //return list. Note return is List<Song>. 
    public List<Song> getList() { 
     System.out.print(playlistName + ":"); 
     for (int i = 0; i < songs.size(); i++) 
     System.out.print(songs.get(i)); 
     return songs; 
    } 

    public boolean removeSong(Song s) { 
     return songs.remove(s); 
    } 

    public double playlistTime() { 
     double sum = 0; 
     for (int j = 0; j < songs.size(); j++) 
      sum = sum + songs.get(j).getPlayTime(); 
     return sum; 
    } 

    public boolean isSongInPlaylist(String name) { 
     boolean x = false; 
     for (int i = 0; i < songs.size(); i++) 
     if (songs.get(i).getSongName().equalsIgnoreCase(name)) 
      x = true; 
     return x; 
    } 

    public void songsByArtist(String name) { 
     for (int i = 0; i < songs.size(); i++) 
      if(songs.get(i).getArtist().equals(name)) 
       System.out.println(songs.get(i).getArtist()); 
    } 

    public boolean addSongsFrom(Playlist p) { // enter code here 
     boolean x = true; 
     for (int i = 0; i < p.getList().size(); i++) 
      if (p.getList().get(i).getSongName().equals(songs.get(i).getSongName())) 
       x = x; 
      else 
       this.addSong(p.getList().get(i)); 
     return x; 
    } 

    public int totalSongs() { 
     return songs.size(); 
    } 

    public String toString() { 
     return playlistName; 
    } 
}

来源

2013-10-19 user2897546

你的课没问题。在你的主要方法中，你必须从文件中读取歌曲。你没有指定，你想要处理的歌曲格式。 MP3，waw，或只是一个简单的txt文件与虚构的数据？

例如，如果你想使用MP3的，你可以使用MP3SPI：

File file = new File(YOUR_FILE_PATH); 
AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(file); 
    if (fileFormat instanceof TAudioFileFormat) { 
     Map<?, ?> properties = ((TAudioFileFormat) fileFormat).properties(); 
     String key = "duration"; 
     Long lengthOfFile= (Long) properties.get(key); 
     //get other properties, then instantiate the Song object, then call addSong() 
}

来源

2013-10-19 10:56:28 Ezzored

java播放列表中的歌曲构造函数

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