Json文件返回多个值，我希望我的getter和setter在为第一个值设置后拒绝其他值

My json API returns multiple network values, My website displays the first value only, where as my pojo reset for upcoming values and sets itself for last value received, I am trying to change my pojo file in such a way that if the values are already set it reject's or should not accept another pair. I am a newbee in json and jackson so please go easy if I ask more questions about your answer and I am trying to compare the data from json against data from live site.My json API returns multiple network values, My