MathCollection

mathCollection is a Java package representing a consistent and efficient extension to the Java Collection Framework of JDK 1.4 that adds the handling of mathematical sets, sets of sets and multisets (bags). There is also a special class for mathematical sets of integer values. Mathematical sets implement usual mathematical functions for sets in an non-destructive way, sets of sets have sets as elements and multisets count the Frequency of each element in the collection. For more information, look at the documentation of the package.