generate a json string from a user object concode_field_sep JSONSerializer userSerializer concode_elem_sep JSONSerializer activitySerializer concode_field_sep List<User> json2Users concode_elem_sep List<Friends> json2Friends concode_elem_sep MyActivity json2Activity concode_elem_sep User json2User concode_elem_sep String activity2Json concode_elem_sep List<MyActivity> json2Activities concode_elem_sep List<Location> json2Locations
String function ( Object arg0 ) { return userSerializer . serialize ( arg0 ) ; }