map - w3toppers.com

Difference between HashMap, LinkedHashMap and TreeMap

I prefer visual presentation: Property HashMap TreeMap LinkedHashMap Iteration Order no guaranteed order, will remain constant over time sorted according to the natural ordering insertion-order Get / put / remove / containsKey O(1) O(log(n)) O(1) Interfaces Map NavigableMap, Map, SortedMap Map Null values/keys allowed only values allowed Fail-fast behavior Fail-fast behavior of an iterator cannot … Read more

What are the reasons why Map.get(Object key) is not (fully) generic

As mentioned by others, the reason why get(), etc. is not generic because the key of the entry you are retrieving does not have to be the same type as the object that you pass in to get(); the specification of the method only requires that they be equal. This follows from how the equals() … Read more

What's the c++ version of this java map code [closed]

std::map<std::string,Skill*> skills; skills[“Endurance”] = new Skill();