Contains static result-returning methods for the basic set operations union, intersection, difference and complement.
This was created because the author hates math with void methods. Using static import de.konradhoeffner.commons.Sets
one can write "Set x = intersection(union(a,b),c);". In standard java-lingo this would be:
Set x = new HashSet(a);
x.addAll(b);
x.retainAll(c);