ios - Initialize NSMutableDictionary -

i developing ios application in want use nsmutabledictionary. doing converting java code objectivec.

so in java have this:

map<string, classa> dict1 = new hashmap<>(); map<integer,character> dict2 = new hashmap<>(); map<integer, map<string,string>> dict3 = new hashmap<>(); 

can please guide me obj-c equivalent code above 3 lines using nsmutabledictionary , how can set , pairs in/from dictionaries.

the objective-c collection classes not typed 3 dictionaries created using:

nsmutabledictionary *dictx = [nsmutabledictionary new]; 

in order populate dictionary use [nsmutabledictionary setobject:forkey:]:

[dict1 setobject:classainstance           forkey:@"key1"]; [dict2 setobject:[nsstring stringwithformat:@"%c", character]           forkey:@(1)]; [dict3 setobject:@{ @"innerkey" : @"innervalue" }           forkey:@(2)]; 

etc.