android - GSON java how can i make different names between mapping and printing? -

i have json this:

{   "aggregation": {     "cityagg" : {       "key" : "paris"     }   } } 

i create mapping , each field, add @serializedname because want create custom names variables.

for example in json, there key names key, want variable in java cityname.

so, this:

@serializedname("key") public string cityname 

i can dynamically map response json objects this:

gson gson = new gson(); query2 query2 = gson.fromjson(response, query2.class); 

it working perfectly.

however, when want print mapped object, this:

string query2string = gson.tojson(query2); gson gsonpretty = new gsonbuilder().setprettyprinting().create(); string prettyjson = gsonpretty.tojson(query2string); 

the problem that, in prettyjson, can see key, not cityname.

i know if there way customize that. don't want see key.

either should use custom deserializer or should alter value of annotation using reflection.

update: worst solution

using reflection looks this

    classloader classloader = urlclassloader.newinstance(new url[]{yourclass.class.getresource("yourclass.class")});     class locannotation = classloader.loadclass("yourpackage.query2");      field field = locannotation.getdeclaredfield("cityname");     final annotation fieldannotation = field.getannotation(serializedname.class);     changeannotationvalue(fieldannotation, "oldvalue", "newvalue");   public static object changeannotationvalue(annotation annotation, string key, object newvalue) {     object handler = proxy.getinvocationhandler(annotation);     field f;     try {         f = handler.getclass().getdeclaredfield("membervalues");     } catch (nosuchfieldexception | securityexception e) {         throw new illegalstateexception(e);     }     f.setaccessible(true);     map<string, object> membervalues;     try {         membervalues = (map<string, object>) f.get(handler);     } catch (illegalargumentexception | illegalaccessexception e) {         throw new illegalstateexception(e);     }     object oldvalue = membervalues.get(key);     if (oldvalue == null || oldvalue.getclass() != newvalue.getclass()) {         throw new illegalargumentexception();     }     membervalues.put(key, newvalue);     return oldvalue; }