如何处理这组Json

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[{"id":2,"grade":"2016级","class:"1班"},{"id":3,"grade":"2016级","class":"2班"},{"id":,4,"grade":"2016级","class":"3班"},{"id":5,"grade":"2015级","class":"1班"}]

已经成功解析,但里面的grade键值对很多值是大量重复的。用listview或Expandablelistview 会出项group项重复;本意效果是


但实际效果是




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