Conclusion

In this chapter, we covered the concept of object persistence. Previously, we had focused mainly on the fundamental object-oriented concepts, and treated the object as an entity that persists only in the life cycle of the application that creates it. We considered the issue of objects that need to persist beyond the life cycle of one or more applications.

For example, an application might need to restore an object that was created by another application or might create an object for later use by itself of other applications. One way to persist an object is to serialize it to a conventional file. Another is to use a relational database.