Assume Map interface has 10 public methods. Hashmap class implemented Map interface and some extra methods, total 20 public methods. Map map = new Hashmap() From this map object how many methods can I access. Can I access 10 or 20?
posted 13 years ago
You can only access the 10 methods of Map through the reference map. You would, in your example, have to cast the reference map to a HashMap reference if you wanted to access all of HashMap's methods. For instance: ((HashMap)map).someMethodSpecificToHashMap()