# Design Patterns For Dummies by Steve Holzner

By Steve Holzner

There is a development the following, and here is tips to use it!Find out how the 23 best layout styles can prevent time and troubleEver consider as though you might have solved this programming challenge earlier than? You -- or somebody -- most likely did, and that is why there is a layout development to assist this time round. This e-book indicates you ways (and while) to exploit the well-known styles constructed by way of the "Gang of Four," plus a few new ones, all designed to make your programming existence easier.Discover how to:* Simplify the programming approach with layout styles* utilize the Decorator, manufacturing facility, and Adapter styles* determine which trend applies* decrease the volume of code wanted for a role* Create your personal styles

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Extra resources for Design Patterns For Dummies

Example text

Another object might be named database to interact with a database server, and so forth. There can be a lot of complexity inside each object, but when you wrap everything up in a set of objects, life becomes a lot easier. You can work in terms of the display object and the few simple methods it exposes, not the setRasterScanRate, populateVideoBuffer, adjustHorizontalHold and dozens of other functions. That makes the programming a lot easier, which is why OOP became important as programs became longer and longer.

Instead of using external algorithms, this design pattern is all about using wrapper code to extend your core code. The formal definition of the Decorator pattern from the GoF book (Design Patterns: Elements of Reusable Object-Oriented Software, 1995, Pearson Education, Inc. Publishing as Pearson Addison Wesley) says you can, “Attach additional responsibilities to an object dynamically. ” This design pattern is called Decorator but that seems to imply optional frills. A better name for this pattern might be the “Augmentor” or “Extender” pattern because that’s what it allows you to do: augment or extend a class dynamically at runtime.

You can add new observer objects at runtime and remove them as needed. When an event occurs, all registered observers are notified. Figure 1-8 shows how it works; an observer can register itself with the subject. Figure 1-8: The Observer pattern lets observers register with subjects. Subject Observer 1 register And another observer, Observer 2, can register itself as well, as shown in Figure 1-9. Figure 1-9: More than one observer can register with a subject. Subject Observer 1 Observer 2 register Now the subject is keeping track of two observers.