查询Android中存在的值

应该怎么查询Android Json中已经存在的值？

{
   "contacts": [
     {
            "id": "c200",
            "name": "Michael Jordan",
            "email": "mj@gmail.com",
            "address": "xx-xx-xxxx,x - street, x - country",
            "gender" : "male",
            "phone": {
                "mobile": "+91 0000000000",
                "home": "00 000000",
                "office": "00 000000"
            }
     }
   ]
}

比如我要查询 Michael Jordan 是否存在，应该怎么实现？