Room如何生成与我的RoomDatabase类同名的类?

为了使用Room,我们创建了一个抽象类来扩展 RoomDatabase

@Database(entities = {Note.class}, version = 1)
public abstract class NoteDatabase extends RoomDatabase {

  private static NoteDatabase instance;

  public abstract NoteDao noteDao();

  public static synchronized NoteDatabase getInstance(Context context) {
      if (instance == null) {
          instance = Room.databaseBuilder(context.getApplicationContext(),
                  NoteDatabase.class, "note_database")
                  .fallbackToDestructiveMigration()
                  .addCallback(roomCallback)
                  .build();
      }
      return instance;
  }

我知道Room为这个类生成了实现,但是我怎么可能得到 NoteDatabase