JavaBDD is a Java library for manipulating BDDs (Binary Decision Diagrams). Binary decision diagrams are widely used in model checking, formal verification, optimizing circuit diagrams, etc. For an excellent overview of the BDD data structure, see this set of lecture notes by Henrik Reif Andersen.
The JavaBDD API is based on that of the popular BuDDy package, a BDD package written in C by J?rn Lind-Nielsen. However, JavaBDD's API is designed to be object-oriented. The ugly C function interface and reference counting schemes have been hidden underneath a uniform, object-oriented interface.
JavaBDD includes a 100% Java implementation. It can also interface with the JDD library, or with three popular BDD libraries written in C via a JNI interface: BuDDy, CUDD, and CAL. JavaBDD provides a uniform interface to all of these libraries, so you can easily switch between them without having to make changes to your application.
JavaBDD is designed for high performance applications, so it also exposes many of the lower level options of the BDD library, like cache sizes and advanced variable reordering.