on a null object reference
按着老师的代码打,但是for (int i = 0; i < mData.obj.size(); i++) 这一行老是报错说java.lang.NullPointerException: Attempt to read from field 'xxx.MonthBean.obj' on a null object reference,为什么呀
按着老师的代码打,但是for (int i = 0; i < mData.obj.size(); i++) 这一行老是报错说java.lang.NullPointerException: Attempt to read from field 'xxx.MonthBean.obj' on a null object reference,为什么呀
2017-11-20
举报