java - Adding more key-value pairs in Map<String, String> of List<Map<String, String> > while iterating list -

i getting list< map < string, string > > api. need iterate through every map elements in list , add more items in map.

here how doing.

list<map<string, string>> list = someapi.getlist(); for(map<string, string> m : list ) {     m.put("key1", "value1" );     m.put("key2", "value2" ); };  return( list ); 

when return list function, doesn't have "key1" -> "value1" values in map. has original value came api. want map elements in list updated these key-value pairs.

any recommendation?