Wildcards in the class definition

Question

I have a class which extends java.util.Hashtable. The Key is String and value is a HttpClient object, but in future I can have Values as objects other than HttpClient. I was thinking to use a wildcard for storing the value, but the syntax isn't right. What is the right way to do it? Thanks.
public class MyHashtable<String, ?> extends Hashtable {
   public MyHashtable() {
}This works:
public class MyHashtable<String, HttpClient> extends Hashtable {
   public MyHashtable() {
}

Answer 1

public class MyHashtable<String, ?> extends Hashtablepublic class MyHashtable<String, T> extends Hashtable<String, Object> or possibly
public class MyHashtable extends Hashtable<String, Object>Why do you need this subclass at all?