How to compare two maps by their values

Question

How to compare two maps by their values? I have two maps containing equal values and want to compare them by their values. Here is an example:

    Map a = ne         


        

Answer 1

Since you asked about ready-made Api's ... well Apache's commons. collections library has a CollectionUtils class that provides easy-to-use methods for Collection manipulation/checking, such as intersection, difference, and union.