Serialization is the ability to change an object into a stream of data. The stream contains not only the data in the object, but information representing the class of the object. Deserialization is the ability to re-create an object from a serialization stream.

Serialization is used in Java in a few places.

• It can be used in RMI as a way of passing an object to a remote method.
• It is also used in JavaBeans. A JavaBean should be serializable because builder tools rely upon the serialization mechanism to save the state of an application, to deploy application, and provide other operations in the builder tool.

Objectives

• Understand how to read and write serialized objects
• implementation of Serializable or Externalizable interface
• support for versioned object
• override writeObject() and readObject(), use defaultWriteObject() and defaultReadObject()
• be aware of members that are not serialized (transients, statics) - and know how to handle them
• Be aware of ways data security may be compromised and know how to avoid security problems
• Be aware of execeptions that may occur during serialization

Specifications

• Duration (total): 1.5 hours
• Duration of Exercises: 30
• Duration of Lecture: 1 hour

Pre-requisites

• Inner Classes
• AWT 1.1 Event Delegation
• Working knowledge of how to create a GUI with events.
• Basic Java knowledge is assumed, including Exception Handling, full use of all the object-oriented concepts, and various classes, such as String, Vector, Enumeration, and the java.io package.
• Those without these pre-requisites should consider one of our 5-day Ultimate Java Programming Workshops.

A table of contents of this module is available upon request.

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