Song.java

class Song {
   private String genre;
   private String artist;
   public Song(String genre, String artist) {
        this.genre = genre;
        this.artist = artist;
    }


// Getter setter
    public String getGenre() {
        return genre;
    }

    public void setGenre(String genre) {
        this.genre = genre;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

 
// hashcode/equals
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Song that = (Song) o;

        if (genre != that.genre)
            return false;
        
        return artist != null ?
                artist.equals(that.artist) :
                that.artist == null;

    }

    @Override
    public int hashCode() {
        int result = genre != null ? genre.hashCode() : 0;
        result = 31 * result + (artist != null ?
                artist.hashCode() : 0);
        return result;
    }
// toString
    @Override
    public String toString() {
        return "Song{" +
                "genre='" + genre + '\'' +
                ", artist='" + artist +
                '}';
    }
}