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17 Writing Code
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Figure 1 44 Template expansion in action
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As an example, open the HelloWorld class that was created in Section 144, Using the Java Class wizard, on page 24 then enter sysout and press Ctrl+Space This expands the sysout template to Systemoutprintln(); with the cursor placed between the two parentheses Type Hello World and press Ctrl+S to save your changes This application will be run in Section 19, Running Applications, on page 55 The Java > Editor > Templates preference page (see Figure 1 45) provides a place to add new templates and edit existing ones
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Figure 1 45 Templates preference page
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CHAPTER 1
Creating DataMatrix In Java
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Using Eclipse Tools
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To add a new template, click the New button to open the Edit Template dialog (see Figure 1 46) Enter the name for the pattern in the Name field, its description in the Description field, and the code pattern itself in the Pattern field (note that code assist is not case-sensitive) Eclipse supports two types of patterns, Java and Javadoc Select the pattern type from the Context drop-down list The Insert Variable button pops up a list of variables that can be inserted into the template Click the OK button to add the template to the template list
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Figure 1 46 Edit Template dialog
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Tip: Some third-party plug-ins provide enhanced templates known as patterns (see Appendix A)
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173 Refactoring
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Refactoring is the process of changing a software system to improve its internal structure and reusability, without altering the external behavior of the program It is a disciplined way of cleaning up code that minimizes the chances of introducing bugs In essence, when developers refactor, they are improving the design of the code Eclipse provides a very powerful and comprehensive collection of refactoring tools that make refactoring operations quick, easy, and reliable The Eclipse refactoring commands are available either from the Java editor s context menu or from the Refactor menu that is available from the main menu bar anytime a Java editor is open The Refactor menu (see Figure 1 47) includes more than a dozen different refactoring commands that modify some aspect of a Java element and then update any references to it elsewhere in the workspace
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Figure 1 47 Refactor menu
Many of the refactoring commands that are supported include the following: Rename Renames a Java element Move Moves a Java element Change Method Signature Changes method parameters (names, types, and order) Extract Method Creates a new method based on the selected text in the current method and updates the current method to call the new method Extract Local Variable Creates a new local variable assigned to the selected expression and replaces the selection with a reference to the new variable Extract Constant Creates a static final field from the selected expression Inline Inlines methods, constants, and local variables Convert Anonymous Class to Nested Converts an anonymous inner class to a named nested class Convert Member Type to Top Level Converts a nested type into a toplevel type
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Using Eclipse Tools
Convert Local Variable to Field Converts a local variable into a field Extract Superclass Creates a common superclass from a set of sibling types The selected sibling types become direct subclasses of the extracted superclass after applying the refactoring Extract Interface Creates a new interface from a collection of selected methods and makes the selected class implement the interface Use Supertype Where Possible Replaces a type with one of its supertypes anywhere that transformation is possible Push Down Moves fields and methods from a class to one of its subclasses Pull Up Moves fields, methods, or member types from a class to one of its superclasses Extract Class Creates a new data class from a collection of fields Introduce Parameter Object Replaces a set of parameters with a new class, and updates all callers of the method to pass an instance of the new class as the value to the introduce parameter Introduce Indirection Creates a static indirection method delegating to the selected method Introduce Factory Replaces a constructor invocation with a call to a new factory method Introduce Parameter Replaces an expression with a parameter reference Encapsulate Field Replaces all direct references to a field with references to the field s getter and setter methods and creates those methods as necessary Generalize Declared Type Generalizes the type of variable declarations, parameters, fields, and method return types Infer Generic Type Arguments Attempts to infer type parameters for all generic type references in a class, package, or project This is especially useful when migrating from Java 14 code to Java 50 code To use any refactoring command, select the Java element or expression that you would like to refactor and then select the refactoring command Each refactoring dialog collects information appropriate to the task it needs to do Once you have supplied that information (for example, the new method name as shown in Figure 1 48), click the OK button to complete the refactoring