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Simple as this sounds, TDD and continuous refactoring turn the world of programming upside down The inexperienced programmer may think, "Write a test for code that doesn't exist Write code that passes a test yet needs immediate refactoring Is this a wasteful, haphazard approach to software development or what " Actually, it's just the opposite TDD and continuous refactoring provide a lean, iterative, and disciplined style of programming that maximizes focus, relaxation, and productivity "Rapid unhurriedness" is how Martin Fowler describes it [as quoted in Beck, TDD], while Ward Cunningham explains that it's more about continuous analysis and design than it is about testing Learning the right rhythm of TDD and continuous refactoring requires practice Tony Mobley, a programmer I know, described this style of development as a paradigm shift as great, if not greater, than moving from structured programming to object-oriented programming However long it takes you to get used to this style of development, once you do, you'll find that producing production code any other way feels odd, uncomfortable, even unprofessional Many of us who program using TDD and continuous refactoring find that it helps us:

Introduces objects and properties, which are displayed in windows Provides an overview of window types Explains how to choose the correct window type Describes various window types in detail Describes how to title windows and set their state Provides guidelines about using multiple document interfaces

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Looking back, we wish we d created the Item type earlier, probably when we extracted UserRequestListener, instead of just using a String to represent the thing a Sniper bids for Had we done so, we could have added the stop price to the existing Item class, and it would have been delivered, by de nition, to where it was needed We might also have noticed sooner that we do not want to index our table on item identi er but on an Item, which would open up the possibility of trying multiple policies in a single auction We re not saying that we should have designed more speculatively for a need that hasn t been proved Rather, when we take the trouble to express the domain clearly, we often nd that we have more options It s often better to de ne domain types to wrap not only Strings but other built-in types too, including collections All we have to do is remember to apply our own advice As you see, sometimes we forget

Switch statements (or their equivalent, if elseif elseif structures) aren't inherently bad They become bad only when they make your design more complicated or rigid than it needs to be In that case, it's best to refactor away from switch statements to a more object-based or polymorphic solution Replace Conditional Dispatcher with Command (191) describes how to break down a large switch statement into a collection of Command [DP] objects, each of which may be looked up and invoked without relying on conditional logic Move Accumulation to Visitor (320) describes an example where switch statements are used to obtain data from instances of classes that have different interfaces By refactoring the code to use a Visitor [DP], no conditional logic is needed and the design becomes more flexible

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This chapter supplements s 7 and 8 of Java Look and Feel Design Guidelines, 2d ed In this chapter, the dialog box window type is subdivided into action windows and property windows, both described here

This smell is a subtle form of duplication It exists when you have numerous pieces of code that do the same thing using different kinds or quantities of data or objects For example, say you have numerous methods on a class for performing queries Each of these methods performs a query using specific conditions and data The more specialized queries you need to support, the more query methods you must create Pretty soon you have an explosion of methods to handle the many ways of performing queries You also have an implicit query language You can remove all of these methods and the combinatorial explosion smell by applying Replace Implicit Language with Interpreter (269)

In which we address the reality of programming in an imperfect world, and add failure reporting We add a new auction event that reports failure We attach a new event listener that will turn off the Sniper if it fails We also write a message to a log and write a unit test that mocks a class, for which we re very sorry To avoid trying your patience any further, we close our example here

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