问Java类不工作

EN

class secondClass extends TimerTask {

    MediaPlayer mp;

    public void onCreate(Context context) {
        mp = MediaPlayer.create(context, R.raw.flyinghome);
    }

    public void run() {
        float x = (float) Math.random();
        float y = (float) Math.random();
        mp.setVolume(x, y);
    }

    public static void main(String[] args) {  
        secondClass task = new secondClass();  
        Timer timer = new Timer();          
        timer.scheduleAtFixedRate(task, 0, 2000);           
    }  
}