private static Field findField(final Class<?> aClass, final BooleanFunction<? super Field> cond) {
    final Field[] res = new Field[]{null};
    forEachField(aClass, new BooleanFunction<Field>() {
      @Override
      public boolean fun(Field field) {
        if (!cond.fun(field)) {
          return true; // continue
        }
        res[0] = field;
        return false; // stop
      }
    });
    return res[0];
  }
private static Field findField(final Class<?> aClass, final BooleanFunction<? super Field> cond)