Making Method Calls Simpler in Java

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Making Method Calls Simpler
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Defining the interface to a class can be difficult Just what the methods are named, and how they are called can lead to confusion or simplicity Refactorings such as Rename Method, Add Parameter, and others from this category can help improve the interface to a class
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Dealing with Generalization
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One of the guidelines we discussed for good object design was to move methods as high up the inheritance hierarchy as possible Getting methods and subclasses in just the right place is the goal of this category of refactorings Some of them include Pull Up Method, Push Down Method, Extract Subclass, and Extract Superclass All are meant to help refine the inheritance hierarchy Some Specific Refactorings
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In Refactoring, each of the individual refactoring descriptions includes the name of the refactoring, a short description of the problem, a short description of the solution, followed by a more detailed discussion of the motivation for using the refactoring, and a discussion of the mechanics for carrying out the refactoring Currently, refactoring is a mostly manual operation It is up to the programmer to identify specific refactorings, and then actually rewrite the code As this book is being written, a few refactoring software tools are beginning to appear that can help with some of the mechanical aspects of the different refactorings The refactoring web site, wwwrefactoringcom, keeps information about the latest refactoring tools The following descriptions of some specific refactorings are neither complete, nor intended to imply that these are the most important refactorings They were chosen simply to illustrate some typical refactorings from each category
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Extract Method
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Extract Method is used when you have a code fragment that can be grouped together That code is extracted and turned into a method whose name will clearly explain the purpose of the method Short, well-named methods can make code clearer A well-named method can eliminate the need for a comment Sometimes you will even find duplicated code that belongs in a method
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Replace Temp with Query
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Replace Temp with Query is used when you find a temporary variable being used to hold the results of an expression By extracting the expression into a method, and then replacing all references to the temp with the method call, the meaning can be clearer, and you will be able to reuse the method in other places
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Move Method
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If you find that a method is being used more often by another class than the one where it is defined, Move Method can be used to move the method to the other class You remove the original definition, and invoke the new method from the original class
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Extract Class
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If you find that you have one class that is doing work that should really be done by two, use Extract Class You will create a new class and move the relevant methods and attributes from the old class into the new one
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Decompose Conditional
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One way to improve complicated conditional statements is to extract the code that makes up the then and else parts into methods with meaningful names This will reduce the complexity, make the statements more meaningful to read, and often result in methods that can be reused
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Rename Method
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Rename Method is one of the simplest refactorings, yet is can lead to code that is much easier to understand If the name of a method (or even a variable) does not indicates its purpose, then it should be renamed so that it is meaningful
Pull Up Method
If you find methods in different subclasses that have identical results, then you can use Pull Up Method to move them to the superclass Eliminating this duplicate behavior will make the code easier to
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