阻止音频播放在彼此的ontop上

Question

public class Player
{
    private PlayList playList;
    public Track currentTrack;
    boolean stopped = false;


    public Player()
    {
        playList = new PlayList("audio");
    }


    public PlayList getPlayList()
    {
        return playList;
    }


    public void play()
    {
        stop();
        if(stopped = true){
            currentTrack.play();
            stopped = false;
        }

    }

    public void stop()
    {
        currentTrack.stop();
        currentTrack.rewind();
        stopped = true;
    }


    public void setTrack(int trackNumber)
    {
        currentTrack = playList.getTrack(trackNumber);
    }

    public String getTrackName()
    {
        return currentTrack.getName();
    }


    public String getTrackInfo()
    {
        getTrackName();
        currentTrack.getDuration();

        return getTrackName() + " (" + currentTrack.getDuration() + ") " + 

"seconds";
        }
    }

我试图阻止音频在彼此上面播放。非常基本的代码（即时学习基础哈哈）这是一个学校作业顺便说一句。一切都完成了，除了音频保持在彼此的顶部，而不是停止播放的第一个音频。