Sharing classes Clause Samples

Sharing classes. The new class sharing mechanism in J&s is a safe, modular mech- anism that relaxes the disjointness of class families. A family of classes may not only inherit another family (and hence all its nested classes), but may also share some of the classes from the family it inherits from. This enables new kinds of extensibility. 2.1 Family inheritance Figure 1. An expression family and a GUI family