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| Opening a Java editor |
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| <h1> |
| Opening a Java editor |
| </h1> |
| <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. |
| </p> |
| <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>, expand the file in the Package Explorer and double click on the method.</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.png" 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 (<img src="../images/org.eclipse.jdt.ui/ovr16/static_co.png" alt="S" >), |
| abstract (<img src="../images/org.eclipse.jdt.ui/ovr16/abstract_co.png" alt="A" >), |
| or final (<img src="../images/org.eclipse.jdt.ui/ovr16/final_co.png" alt="F" >). Different icons show you whether a method overrides a method from a |
| base class (<img src="../images/org.eclipse.jdt.ui/ovr16/over_co.png" alt="overridden"> |
| ) or |
| when it implements a method from an interface (<img src="../images/org.eclipse.jdt.ui/ovr16/implm_co.png" alt="implements"> |
| ). |
| <p> |
| <img src="../images/qs-9.png" 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. |
| Before going to the next step make sure that <STRONG>Hide Non-Public |
| Members</STRONG> |
| button is not pressed.<p> |
| <img src="../images/qs-10.png" 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.png" 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.png" alt="Range indicator"> |
| </p> |
| </li> |
| </ol> |
| </p> |
| <p> |
| <img border="0" src="../images/ngrelc.png" alt="Related concepts" > |
| </p> |
| <p> |
| <a href="../concepts/concepts-6.htm">Java views</a><br> |
| <a href="../concepts/concepts-7.htm">Java editor</a><br> |
| </p> |
| <p> |
| <img src="../images/ngrelt.png" alt="Related tasks" border="0" > |
| </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.png" 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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