| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
| <html> |
| <head> |
| <meta name="copyright" content="Copyright (c) IBM Corporation and others 2000, 2005. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." > |
| <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <link rel="stylesheet" href="../book.css" charset="ISO-8859-1" type="text/css"> |
| <title> |
| Evaluating expressions |
| </title> |
| </head> |
| <body> |
| <h1> |
| Evaluating expressions |
| </h1> |
| |
| <p>When the VM suspends a thread (due to hitting a breakpoint or stepping through |
| code), you can evaluate expressions in the context of a stack frame. </p> |
| |
| <ol> |
| <li> Select the stack frame in which an evaluation is to be performed. For the |
| detail panes of the <strong>Variables</strong> and <strong>Expressions</strong> |
| views, the evaluation context will be a selected variable. If no variable |
| is selected, the selected stack frame will be the context. </li> |
| <li> Expressions can be entered and evaluated in the following areas: |
| <ul> |
| <li> <strong>Display</strong> view </li> |
| <li> Detail pane of the <strong>Expressions</strong> view </li> |
| <li> Detail pane of the <strong>Variables</strong> view </li> |
| <li> Java editor when it is displaying source and it is not read-only </li> |
| </ul> |
| </li> |
| <li> Select the expression to be evaluated and select <strong>Display</strong>, |
| <strong>Inspect</strong> or <strong>Execute</strong> from the context pop-up |
| menu. The result of a <strong>Display</strong> or <strong>Inspect </strong>evaluation |
| is shown in a popup window. Note that <strong>Execute</strong> does not display |
| a result - the expression is just executed.</li> |
| <li>The result popup window can be dismissed by clicking outside of the popup |
| window or by pressing <strong>Esc</strong>. The result can be persisted to |
| the Display view (if <strong>Display</strong> was chosen) or Expressions view |
| (if <strong>Inspect</strong> was chosen) by pressing the key sequence shown |
| at the bottom of the popup window. For example, to move the result of an <strong>Inspect |
| </strong>evaluation to the Expressions view press <strong>CTRL-Shift-I</strong>. |
| Note that when the <strong>Display</strong> action is used from the Display |
| view the result is written to the Display view rather than a popup</li> |
| </ol> |
| <p><strong>Note:</strong> Evaluations cannot be performed in threads that have been manually suspended.</p> |
| <p> |
| <img border="0" src="../images/ngrelc.png" alt="Related concepts" ><br> |
| <a href="../concepts/concepts-10.htm">Debugger</a><br> |
| <a href="../concepts/concepts-7.htm">Java editor</a> |
| </p> |
| <p> |
| <img border="0" src="../images/ngrelt.png" alt="Related tasks" ><br> |
| <a href="../tasks/tasks-134.htm">Suspending threads</a><br> |
| <a href="../tasks/tasks-135.htm">Resuming the execution of suspended threads</a> |
| </p> |
| <p> |
| <img border="0" src="../images/ngrelr.png" alt="Related reference" ><br> |
| <a href="../reference/ref-52.htm">Display view</a><br> |
| <a href="../reference/ref-56.htm">Expressions view</a><br> |
| <a href="../reference/ref-56c.htm">Expressions view Show Detail Pane</a><br> |
| <a href="../reference/ref-74.htm">Variables view</a><br> |
| <a href="../reference/ref-showdetailpane.htm">Variables view Show Detail Pane</a> |
| </p> |
| |
| </body> |
| </html> |
| |
