Java J2ee Planet

This pattern is one level of abstraction higher than factory pattern. This means that the abstract factory returns the factory of classes. Like Factory pattern returned one of the several sub-classes, this returns such factory which later will return one of the sub-classes. Let’s understand this pattern with the help of an example. Suppose we need to get the specification of various parts of a computer based on which work the computer will be used for. The different parts of computer are, say Monitor, RAM and Processor. The different types of computers are PC, Workstation and Server. So, here we have an abstract base class Computer. package creational.abstractfactory; public abstract class Computer { /** * Abstract method, returns the Parts ideal for * Server * @return Parts */ public abstract Parts getRAM(); /** * Abstract method, returns the Parts ideal for * Workstation * @return Parts */ public abstract Parts getProcessor(); /** * Abstract method...