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| Opening a Java editor |
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| <h1> |
| Opening a Java editor |
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| <p> |
| In this section, you will learn how to open an editor for Java files. You will also learn about some of the basic Java editor features. |
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| <p> |
| <ol> |
| <li> Expand the package <em>junit.samples</em> and select the file <em>VectorTest.java</em>. |
| You can open <em>VectorTest.java</em> in the Java editor by double clicking on |
| it. In general you can open a Java editor for Java files, types, methods and fields by simply double |
| clicking on them. For example, to open the editor directly on the method <em>testClone</em> |
| defined in <em>VectorTest.java</em> double click on the method in the Package Explorer.</li> |
| <li> Notice the syntax highlighting. Different kinds of elements in the |
| java source are rendered in unique colors. Examples of java source |
| elements that are rendered differently are: |
| <ul> |
| <li> Regular comments </li> |
| <li> Javadoc comments </li> |
| <li> Keywords </li> |
| <li> Strings. </li> |
| </ul> |
| <p> |
| <img src="../images/qs-8.gif" width=528 height=459 alt="Syntax highlighting"> |
| </p> |
| </li> |
| <li> Look at the Outline view. It displays an outline of the Java file including |
| the package declaration, import declarations, fields, types and methods. The |
| Outline view uses icons to annotate Java elements. For example, icons indicate whether a Java element is static, abstract, |
| or final. Different icons show you whether a method is overridden from a |
| base class (<img src="../images/org.eclipse.jdt.ui/ovr16/over_co.gif" width=7 height=8 alt="overridden"> |
| ) or |
| when it implements a method from an interface (<img src="../images/org.eclipse.jdt.ui/ovr16/implm_co.gif" width=7 height=8 alt="implements"> |
| ). |
| <p> |
| <img src="../images/qs-9.gif" width=218 height=329 alt="Outline view"> |
| </p> |
| </li> |
| <li> Toggle the <strong>Hide Fields</strong>, <strong>Hide Static Members</strong>, |
| and <strong>Hide Non-Public Members</strong> buttons in the Outline view toolbar |
| to filter the view's display. |
| <p> |
| <img src="../images/qs-10.gif" width=220 height=92 alt="Outline view tool bar"> |
| </p> |
| </li> |
| <li> You can edit source code by viewing the whole Java file, or you can narrow |
| the view to a single Java element. The toolbar includes a button, <strong>Show Source of Selected |
| Element Only</strong>, that will cause only the source code of the selected |
| outline element to be displayed in the Java editor. In the example |
| below, only the <em>setUp()</em> method is displayed. |
| <p> |
| <img src="../images/qs-11.gif" width=525 height=226 alt="Show selected element only tool bar button"> |
| </p> |
| </li> |
| <li> Press the <strong>Show Source of Selected Element Only</strong> button |
| again to see the whole Java file again. In the Outline view, select different |
| elements and note that they are again displayed in a whole file view |
| in the editor. The Outline view selection now contains a range indicator |
| on the vertical ruler on the left border of the Java editor that indicates |
| the range of the selected element. |
| <p> |
| <img src="../images/qs-12.gif" width=485 height=218 alt="Range indicator"> |
| </p> |
| </li> |
| </ol> |
| </p> |
| <p> |
| <img border="0" src="../images/ngrelc.gif" alt="Related concepts" width="159" height="27"> |
| </p> |
| <p> |
| <a href="../tasks/tasks-6.htm">Java views</a><br> |
| <a href="../concepts/concepts-7.htm">Java editor</a><br> |
| </p> |
| <p> |
| <img src="../images/ngrelt.gif" alt="Related tasks" border="0" height="27" width="159"> |
| </p> |
| <p> |
| <a href="../tasks/tasks-54.htm">Using the Java editor</a><br> |
| <a href="../tasks/tasks-2.htm">Showing and hiding elements</a><br> |
| <a href="../tasks/tasks-6.htm">Showing single elements or whole Java files</a><br> |
| <a href="../tasks/tasks-195.htm">Sorting elements in Java views</a><br> |
| </p> |
| <p> |
| <img src="../images/ngrelr.gif" width=159 height=27 alt="Related reference"> |
| </p> |
| <p> |
| <a href="../reference/ref-view-outline.htm">Java Outline View</a><br> |
| <a href="../reference/ref-21.htm">Java Editor Preferences</a><br> |
| </p> |
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| <a href="../hglegal2003.htm"><img src="../images/ngibmcpy2003.gif" width=324 height=14 alt="Copyright (c) 2000, 2003 IBM Corporation and others. All Rights Reserved." border="0"></a> |
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