如何通过从第1类调用第2类的方法来调用第3类的方法

Question

I have one class naming 'Artist' from this class I can call the public method getArtists of class 'Track' which in the return value gives me an array of another class 'ArtistSimplified'. I am in interested in the method getName which returns a string of ArtistSimplified class. I want to know how to do it. I can not directly call the getName method of ArtistSimplified class.

        List<Track> tracks = new ArrayList<>();
        tracks = Arrays.asList(topTracksRequest.execute());
        if(tracks == null) {
            throw new ResourceNotFoundException(new ErrorMessage("No songs found for this id:" +artistId));
        }

        List<Song> songs = new ArrayList<Song>();
        for(int i = 0; i < 5; i++) {
            Song song = new Song();
            song.setTitle(tracks.get(i).getName());
            song.setArtist(tracks.get(i).getArtists().getClass().getMethod("getName", ArtistSimplified.class).getReturnType());
        }

I am stuck here. song.setArtist(tracks.get(i).getArtists().getClass().getMethod("getName", ArtistSimplified.class).getReturnType());

I tried the above line but it does not work.

Answer 1

Your code is trying to call getName() on the array itself. You need to inform an index to which Artist you're going to get the name from.

for (int a = 0; a < tracks.get(i).getArtists().length; a++) { 
        System.out.print(tracks.get(i).getArtists()[a].getName()); 
}