3.2 Chapter Goals

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3.2 Chapter Goals

After reading this chapter you should know:

• How to specify an ensemble, or a collection of objects that cooperate to implement a solution to a problem

• The difference between an active object and a passive object, and why the difference between these two types of objects is important

• How to implement an active object

• How to design a passive object using a state diagram

• How to translate a state diagram into a working Java object

• How to define a controlling object and how to use the control object to link together all the objects in an ensemble

• How to use this method to solve a problem that has multiple different threads

• Why passive objects are components

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