// 属性对象
if (dest.size() > 0
&& dest.getLast() instanceof AccessOpt
&& rpn.size() > 0
&& rpn.getFirst() instanceof AccessOpt) {
dest.add(new FieldObj(obj.getVal()));
continue;
}
// //普通的对象
// if(!(dest.getLast() instanceof AccessOpt) && !(rpn.peekFirst()
// instanceof MethodOpt)){