syntaxref.fm4.html

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<html><head><title></title></head><body bgcolor=#ffffff> <a href="tags.html">[Top]</a> <a href="syntaxref.fm3.html">[Prev]</a> <a href="syntaxref.fm5.html">[Next]</a> <a href="Copyright.fm.html">[Bottom]</a><hr><br> <a name="11258"> </a><h2 align="center"> Expression</h2><p><a name="11259"> </a>Contains an expression valid in the page scripting language.</p><a name="11260"> </a><h4> JSP Syntax</h4><blockquote><pre><code>&lt;%= </code><em>expression</em><code> %&gt;</code></pre></blockquote><a name="11262"> </a><h4> Examples</h4><blockquote><pre>The map file has &lt;font color="blue"&gt;<strong>&lt;%= map.getCount() %&gt;</strong>&lt;/font&gt; entries.Good guess, but nope. Try &lt;b&gt;<strong>&lt;%= numguess.getHint() %&gt;</strong>&lt;/b&gt;.</pre></blockquote><a name="11264"> </a><h4> Description</h4><p><a name="15961"> </a>An expression tag contains a scripting language expression that is evaluated, converted to a <code>String</code>, and inserted where the expression appears in the JSP file. Because the value of an expression is converted to a String, you can use an expression within text in a JSP file.</p><p><a name="16344"> </a>When you use the Java language for scripting, remember these points:</p><ul><a name="15933"> </a><li>You cannot use a semicolon to end an expression (however, the same expression within scriptlet tags requires the semicolon; see <a href="syntaxref.fm5.html#10996">Scriptlet</a>).<a name="15934"> </a><li>The expression tag can contain any expression that is valid according to the <em>Java Language Specification</em>.</ul><p><a name="11281"> </a>You can sometimes use expressions as attribute values in JSP tags (see the <em>JavaServer Pages</em>TM<em> Syntax Card</em>). If an expression has more than one part, the parts are evaluated in left-to-right order as they appear in the tag.</p><a name="11268"> </a><h4> See Also</h4><ul><a name="11272"> </a><li><a href="syntaxref.fm3.html#10983">Declaration</a><a name="11276"> </a><li><a href="syntaxref.fm5.html#10996">Scriptlet</a></ul><hr><br> <a href="tags.html">[Top]</a> <a href="syntaxref.fm3.html">[Prev]</a> <a href="syntaxref.fm5.html">[Next]</a> <a href="Copyright.fm.html">[Bottom]</a><hr><br><i>Copyright  &#169; 1999, Sun Microsystems, Inc.   All rightsreserved.</i></body></html>

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