Simple comparator that decides one map to be smaller/larger than the other if *all* its elements are smaller/larger than those of the other. Otherwise, 0 is returned. In case map sizes don't match or one of the maps is empty, 0 is returned as well.
@author Roland Ewald
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.