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Sams Teach Yourself J2EE™ in 21 Days by Peter Roxburgh, Andy Longshaw, Debbie Law, Dan Haywood, Martin Bond

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Benefits of the 3-Tier Scenario

A modern n-tier application architecture, such as that provided by J2EE, involves the separation of functionality both by using layers and tiers and also the use of components within those layers (and objects within those components).

Now, presentational developers need not know anything of the business rules in the system, and any changes to any of the layers should not impact the effectiveness of any of the others. This aids in maintenance of the system and promotes scalability and extensibility. The separation into components helps with the division of tasks even further.

With the advent of the Internet, enabling more businesses to deliver goods and services online, it is easier to deliver functionality to customers ...

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