Using data structures (20 points) This quarter you have also gotten experience with the Hash Map class in Java. When working with Hash Maps, sometimes cases arise where we wish to determine if two Hash Maps have any key/value pairs in common. For example, we might have the following two Hash maps (named hashmap1 and hashmap2, respectively) that map from String to String (i.e., their type is Hash Map) and we want to count how many key/value pairs they have in common.

 

n the example above, these two Hash Maps have two key/value pairs in common, namely: "Mary"/"Ecstatic" and "Bob"/"Happy". Note that although the key "Felix" is in both Hash Maps, the associated value with this key is different in the two maps (hence this does not count as a key/value pair that is common to both Hash Maps). Similarly, just having the same value without the same key (such as the value "Fine" which is mapped to by different keys in the two different Hash Maps) would also not count as a common key/value pair between the two Hash Maps. Your job is to write a method:

that is passed two objects of type HashMap and returns the number of common key/value pairs between the two Hash Maps.