I don’t show the code right now, but my example creates these Maps with four specific implementations: ... using Montana Map of type java.util.HashMap returns true for Map.containsKey() ...

Both the Hashtable and HashMap implement the Map interface and both share the same set of methods used to add, remove and manipulate elements of a key-value, pair-based collection class. As this ...

The HashMap tutorial also includes some useful code snippets that help developers understand what's going on with a Java HashMap under the covers. For example, the following code used in the tutorial ...