Constructor for a non-generic subclass of a Collection
generics, java
Solution
Just plain `super();` will work—or nothing at all, since it is implied. Remember that `new HashMap<String,Integer>();` is not really a constructor invocation in the same sense of a method invocation: it is the specification of the type to instantiate + constructor arguments. The constructor itself does not receive the type arguments, they are there only as call-site type information.
Problem
This is something I should know, but I'm drawing a blank on it and am having a surprising amount of difficulty trying to find the answer with google. I'm trying to extend a Java `Collection`, specifically the `ConcurrentHashMap`. I want to create my own hash map class for use with non-generic key/value pairs, specifically using my own classes. So I've defined the class as such: ``` public class hashMap extends ConcurrentHashMap<class1, class2> ``` The issue is I'm forgetting how to properly write the constructor(s) so that they're non-generic. For instance, with the original `concurrentHashMap`, you have to call its constructor specifying the classes for the key/value pairs. I want to just simply be able to call the constructor `hashMap()`, without needing to specify those generics. I've tried calling `super<class1, class2>();` in the constructor, but that gave me an error. This seems like it should be something very simple, and I'm positive I used to know how to do this, but it's been a while and like I said I'm drawing a blank. Thanks.