How to extract key value from a JSON response in Java Language? : {"reservation_upto": {"lng": 78.0098161, "lat": 27.1752554, "code": "AGC", "name": "AGRA CANTT"},
"debit": 3,
"doj": "28-05-2018",
"to_station": {"lng": 78.0098161, "lat": 27.1752554, "code": "AGC", "name": "AGRA CANTT"},
"response_code": 200,
"boarding_point": {"lng": 80.2755685, "lat": 13.081674, "code": "MAS", "name": "CHENNAI CENTRAL"},
"pnr": "4405474586",
"chart_prepared": false,
"journey_class": {"code": "3A", "name": null},