Figure 1-41 Code Assist in action in Java

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Figure 1-41 Code Assist in action
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Tip: If the code assist window fails to open and code assist just beeps at you instead, check you Java Build Path and then check your code as it may have so many problems that the Java compiler cannot make sense of it Remember, the Java compiler is always working in the background!
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The Java > Editor > Code Assist preference page (see Figure 1-42) provides a number of options to control how code assist acts when invoked
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Figure 1-42 Code Assist preference page
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Quick Fix automatic problem correction
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The Quick Fix feature provides a way to easily fix common problems within the Java editor Any time there is a problem detected that can be fixed, a light bulb icon is displayed in the marker bar (left-hand vertical ruler) of the editor Clicking on the icon opens the popup Quick Fix window (see Figure 1-43) Selecting the appropriate fix from the list applies that fix to the Java source
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Figure 1-43 Quick Fix in action
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There are dozens of built-in quick fixes available, including: Correcting missing or incorrect package declarations Removing unused and duplicate imports Changing the visibility of types, methods and fields Renaming types, methods and fields Removing unused private types, methods and fields Creating new types, methods and fields Fixing incorrect method arguments Adding or removing catch blocks Adding necessary cast operations
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172 Templates Templates are common source code patterns that appear frequently in userwritten code Eclipse has dozens of built-in templates and new ones are very easy to add To use a template, position the cursor at the desired position in your Java code, start to type the name of the template, and hit Ctrl + Space This opens the popup content assist window (see Figure 1-44) Note that some templates are parameterized with user-defined variables Once the template has been expanded, use the Tab key to move between variables
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As an example, open the HelloWorld class we created in section 144, type sysout , and press Ctrl+Space This offers to expand the sysout template to Systemoutprintln(); with the cursor placed between the two parenthesis Type Hello World and press Ctrl+S to save your changes We will run this application in section 19 below
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Figure 1-44 Quick Fix in action
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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 Template preference page
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To add a new template, click the New button to open the New 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
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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
Figure 1-46 Template preference page
Tip: Some third party plug-ins provide enhanced templates known as patterns (see Appendix A)
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173 Refactoring 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 Refactoring menu that is available from the main menu bar any time a Java editor is open The Refactoring 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