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| <title>Refactoring support</title> |
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| <h1>Refactoring support</h1> |
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| <p>The goal of Java program refactoring is to make system-wide code changes without affecting the behavior of the |
| program. The Java tools provide assistance in easily refactoring code. |
| </p> |
| |
| <p>The refactoring tools support a number of transformations described in Martin Fowler's |
| book <span class="name">Refactoring: Improving the Design of Existing Code</span>, Addison Wesley |
| 1999, such as <span class="name">Extract Method</span>, <span class="name">Inline Local |
| Variable, etc.</span></p> |
| |
| <p>When performing a refactoring operation, you can optionally preview all |
| of the changes resulting from a refactoring action before you choose to carry them out. |
| When previewing a refactoring operation, you will be notified of potential |
| problems and will be presented with a list of the changes the |
| refactoring action will perform. If you do not preview a refactoring |
| operation, the change will be made in its entirety and any resultant |
| problems will be shown. If a problem is detected that does not allow |
| the refactoring to continue, the operation will be halted and a list of |
| problems will be displayed.</p> |
| |
| <p>Refactoring commands are available from the context menus of several Java views (e.g. Package Explorer, Outline) and editors. |
| Many "apparently simple" commands, such as <strong>Move</strong> and <strong>Rename</strong>, are |
| actually refactoring operations, since moving and renaming Java elements |
| often require changes in dependent files. |
| </p> |
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| <p>Refactorings can not only be performed interactively, but also from refactoring scripts. Most refactorings available in the <strong>Refactor</strong> |
| menu are stored in the workspace refactoring history in order to be used in refactoring scripts afterwards. The refactoring tools support the creation of refactoring |
| scripts based on refactorings in the workspace refactoring history. Refactoring scripts can then be applied to an arbitrary workspace. Applying a refactoring |
| script launches a refactoring wizard which is able to replay the refactorings as if they had been initiated by the user which originally had created them. |
| </p> |
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| <p>Related to refactoring scripts, the refactoring tools offer a refactoring to migrate a JAR File to a newer version, using refactoring information |
| to avoid breaking changes in your workspace after the migration. |
| </p> |
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| <p><img border="0" src="../images/ngrelt.png" alt="Related tasks"></p> |
| <p> |
| <a href="../tasks/tasks-240.htm">Creating refactoring scripts</a><br> |
| <a href="../tasks/tasks-241.htm">Applying refactoring scripts</a><br> |
| <a href="../tasks/tasks-242.htm">Browsing the refactoring history</a> |
| </p> |
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| <p><img border="0" src="../images/ngrelr.png" alt="Related reference"></p> |
| <p> |
| <a href="../reference/ref-menu-refactor.htm">Refactoring actions</a><br> |
| <a href="../reference/ref-117.htm">Refactoring wizard</a><br> |
| <a href="../reference/ref-13.htm">Java preferences</a> |
| </p> |
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