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Using Eclipse Tools
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The colored syntax highlighting feature controls how Java code will be depicted Independent control over color and font style (plain or bold) is provided for multi- and single-line comments, keywords, strings, characters, task tags, and Javadoc elements via the Java > Editor > Syntax Coloring preference page (see Figure 1 38)
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Figure 1 38 Syntax Coloring preference page
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User-defined code formatting
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The code formatting feature controls how Java code will be formatted any time the Source > Format command is issued A variety of options are provided for controlling brace position, new lines, line length, and white space usage through use of the Java > Code Style > Formatter preference page (see Figure 1 39)
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Tip: Alternate code formatters are available, including Jalopy integration into Eclipse (jalopysourceforgenet)
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Figure 1 39 Code Formatter preference page
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Organizing Java import statements
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The import organization feature provides an easy way to clean up the import statements within a Java file New imports can be added using the Source > Add Import command, and existing imports can be cleaned up using the Source > Organize Imports command The Java > Code Style > Organize Imports preference page (see Figure 1 40) provides a means to set the default order of import statements and the threshold above which wildcard imports will be used
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Tip: Set the threshold to 1 to cause packages to be imported with * immediately, or keep the default value at 99 to always import each type individually, depending on your coding style
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Using Eclipse Tools
Figure 1 40 Organize Imports preference page
Context-sensitive content assist
The context-sensitive content assist feature can help speed up the creation of Java code quite dramatically It can complete class names, method names, parameter names, and more CamelCase patterns, such as NPE, will expand to full class names such as NullPointerException To use it, position the cursor at a location in your Java code needing a suggestion and select either the Edit > Content Assist > Default command or hold the Ctrl key down while pressing the Space key This opens the popup code assist window (see Figure 1 41)
Tip: If the code assist window fails to open and the feature just beeps at you instead, check your Java build path and then check your code because it may have so many problems that the compiler cannot make sense of it Remember, the Java compiler is always working in the background!
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Figure 1 41
Content assistance in action
The Java > Editor > Content Assist preference page (see Figure 1 42) provides a number of options to control how the content assist feature acts when invoked
Figure 1 42 Content Assist preference page
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CHAPTER 1
Using Eclipse Tools
Quick fix automatic problem correction
The quick fix feature provides a way to easily fix common problems within the Java editor Any time a problem is detected that can be fixed, a light bulb icon is displayed in the marker bar (left vertical ruler) of the editor Clicking on the icon or selecting the Edit > Quick Fix command opens a popup quick fix window (see Figure 1 43) Selecting the appropriate one from the list applies that fix to the Java source
Figure 1 43 Quick fix in action
Dozens of built-in quick fixes are 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
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 press Ctrl+Space This opens the popup content assist window (see Figure 1 44) Note that some templates are parameterized with user-defined variables Once a template has been expanded, use the Tab key to move between variables