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1 2 | <html><head><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 4. Expressions</title><link href="../docbook.css" type="text/css" rel="stylesheet"><meta content="DocBook XSL Stylesheets V1.78.1" name="generator"><link rel="home" href="index.html" title="OGNL Language Guide"><link rel="up" href="index.html" title="OGNL Language Guide"><link rel="prev" href="basicSyntax.html" title="Chapter 3. Syntax"><link rel="next" href="properties.html" title="Referring to Properties"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">Chapter 4. Expressions</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="basicSyntax.html"><img src="../images/navigation/prev.gif" alt="Prev"></a> </td><th align="center" width="60%"> </th><td align="right" width="20%"> <a accesskey="n" href="properties.html"><img src="../images/navigation/next.gif" alt="Next"></a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="basicExpressions"></a>Chapter 4. Expressions</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="basicExpressions.html#constants">Constants</a></span></dt><dt><span class="section"><a href="properties.html">Referring to Properties</a></span></dt><dt><span class="section"><a href="indexing.html">Indexing</a></span></dt><dd><dl><dt><span class="section"><a href="indexing.html#N10184">Array and List Indexing</a></span></dt><dt><span class="section"><a href="indexing.html#N10189">JavaBeans Indexed Properties</a></span></dt><dt><span class="section"><a href="indexing.html#N101C5">OGNL Object Indexed Properties</a></span></dt></dl></dd><dt><span class="section"><a href="methods.html">Calling Methods</a></span></dt><dt><span class="section"><a href="varref.html">Variable References</a></span></dt><dt><span class="section"><a href="paren.html">Parenthetical Expressions</a></span></dt><dt><span class="section"><a href="chainedSubexpressions.html">Chained Subexpressions</a></span></dt><dt><span class="section"><a href="collectionConstruction.html">Collection Construction</a></span></dt><dd><dl><dt><span class="section"><a href="collectionConstruction.html#listConstruction">Lists</a></span></dt><dt><span class="section"><a href="collectionConstruction.html#nativeArrayConstruction">Native Arrays</a></span></dt><dt><span class="section"><a href="collectionConstruction.html#mapConstruction">Maps</a></span></dt></dl></dd><dt><span class="section"><a href="projection.html">Projecting Across Collections</a></span></dt><dt><span class="section"><a href="selection.html">Selecting From Collections</a></span></dt><dd><dl><dt><span class="section"><a href="selection.html#N10300">Selecting First Match</a></span></dt><dt><span class="section"><a href="selection.html#N10316">Selecting Last Match</a></span></dt></dl></dd><dt><span class="section"><a href="constructors.html">Calling Constructors</a></span></dt><dt><span class="section"><a href="staticMethods.html">Calling Static Methods</a></span></dt><dt><span class="section"><a href="staticFields.html">Getting Static Fields</a></span></dt><dt><span class="section"><a href="expressionEvaluation.html">Expression Evaluation</a></span></dt><dt><span class="section"><a href="lambdaExpressions.html">Pseudo-Lambda Expressions</a></span></dt><dt><span class="section"><a href="specialCollectionsProperties.html">Pseudo-Properties for Collections</a></span></dt><dt><span class="section"><a href="differences.html">Operators that differ from Java's operators</a></span></dt><dt><span class="section"><a href="settingVersusGetting.html">Setting values versus getting values</a></span></dt></dl></div><p>This section outlines the details the elements of <acronym class="acronym">OGNL</acronym>'s expressions.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="constants"></a>Constants</h2></div></div></div><p><acronym class="acronym">OGNL</acronym> has the following kinds of constants:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>String literals, as in Java (with the addition of single quotes): delimited by single- or double-quotes, with the full set of character escapes.</p></li><li class="listitem"><p>Character literals, also as in Java: delimited by single-quotes, also with the full set of escapes.</p></li><li class="listitem"><p>Numeric literals, with a few more kinds than Java. In addition to Java's ints, longs, floats and doubles, <acronym class="acronym">OGNL</acronym> lets you specify BigDecimals with a "b" or "B" suffix, and BigIntegers
with an "h" or "H" suffix (think "huge"---we chose "h" for BigIntegers because it does not interfere with hexadecimal digits).</p></li><li class="listitem"><p>Boolean <code class="constant">(true</code> and <code class="constant">false</code>) literals.</p></li><li class="listitem"><p>The <code class="constant">null</code> literal.</p></li></ul></div></div></div><div class="navfooter"><hr><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="basicSyntax.html"><img src="../images/navigation/prev.gif" alt="Prev"></a> </td><td align="center" width="20%"> </td><td align="right" width="40%"> <a accesskey="n" href="properties.html"><img src="../images/navigation/next.gif" alt="Next"></a></td></tr><tr><td valign="top" align="left" width="40%">Chapter 3. Syntax </td><td align="center" width="20%"><a accesskey="h" href="index.html"><img src="../images/navigation/home.gif" alt="Home"></a></td><td valign="top" align="right" width="40%"> Referring to Properties</td></tr></table></div></body></html>
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