Java around the world

Object-oriented applications make considerable use of inheritance, and they frequently want to use that inheritance (or "is-a") relationship to categorize and organize objects within a given system. This can prove difficult in a relational storage scheme, which has no intrinsic concept of inheritance, but in an OODBMS, it's a core feature. In this installment of The busy Java developer's guide to db4o, discover the surprising ease (and power) of using inheritance as a core feature when creating queries in db4o.