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<li>Summary: </li>
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<div class="subTitle">javax.servlet.jsp.tagext</div>
<h2 title="Class TagSupport" class="title">Class TagSupport</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>javax.servlet.jsp.tagext.TagSupport</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>All Implemented Interfaces:</dt>
<dd>java.io.Serializable, <a href="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</a>, <a href="../../../../javax/servlet/jsp/tagext/JspTag.html" title="interface in javax.servlet.jsp.tagext">JspTag</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../javax/servlet/jsp/tagext/BodyTagSupport.html" title="class in javax.servlet.jsp.tagext">BodyTagSupport</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">TagSupport</span>
extends java.lang.Object
implements <a href="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</a>, java.io.Serializable</pre>
<div class="block">A base class for defining new tag handlers implementing Tag.
<p> The TagSupport class is a utility class intended to be used as
the base class for new tag handlers. The TagSupport class
implements the Tag and IterationTag interfaces and adds additional
convenience methods including getter methods for the properties in
Tag. TagSupport has one static method that is included to
facilitate coordination among cooperating tags.
<p> Many tag handlers will extend TagSupport and only redefine a
few methods.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#javax.servlet.jsp.tagext.TagSupport">Serialized Form</a></dd></dl>
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<h3>Field Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#id">id</a></strong></code>
<div class="block">The value of the id attribute of this tag; or null.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a></code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#pageContext">pageContext</a></strong></code>
<div class="block">The PageContext.</div>
</td>
</tr>
</table>
<ul class="blockList">
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<h3>Fields inherited from interface javax.servlet.jsp.tagext.<a href="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</a></h3>
<code><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html#EVAL_BODY_AGAIN">EVAL_BODY_AGAIN</a></code></li>
</ul>
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<h3>Fields inherited from interface javax.servlet.jsp.tagext.<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></h3>
<code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_BODY_INCLUDE">EVAL_BODY_INCLUDE</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#EVAL_PAGE">EVAL_PAGE</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_BODY">SKIP_BODY</a>, <a href="../../../../javax/servlet/jsp/tagext/Tag.html#SKIP_PAGE">SKIP_PAGE</a></code></li>
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<h3>Constructor Summary</h3>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#TagSupport()">TagSupport</a></strong>()</code>
<div class="block">Default constructor, all subclasses are required to define only
a public constructor with the same signature, and to call the
superclass constructor.</div>
</td>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#doAfterBody()">doAfterBody</a></strong>()</code>
<div class="block">Default processing for a body.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#doEndTag()">doEndTag</a></strong>()</code>
<div class="block">Default processing of the end tag returning EVAL_PAGE.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#doStartTag()">doStartTag</a></strong>()</code>
<div class="block">Default processing of the start tag, returning SKIP_BODY.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#findAncestorWithClass(javax.servlet.jsp.tagext.Tag,%20java.lang.Class)">findAncestorWithClass</a></strong>(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> from,
java.lang.Class klass)</code>
<div class="block">Find the instance of a given class type that is closest to a given
instance.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#getId()">getId</a></strong>()</code>
<div class="block">The value of the id attribute of this tag; or null.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#getParent()">getParent</a></strong>()</code>
<div class="block">The Tag instance most closely enclosing this tag instance.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#getValue(java.lang.String)">getValue</a></strong>(java.lang.String k)</code>
<div class="block">Get a the value associated with a key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Enumeration<java.lang.String></code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#getValues()">getValues</a></strong>()</code>
<div class="block">Enumerate the keys for the values kept by this tag handler.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#release()">release</a></strong>()</code>
<div class="block">Release state.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#removeValue(java.lang.String)">removeValue</a></strong>(java.lang.String k)</code>
<div class="block">Remove a value associated with a key.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#setId(java.lang.String)">setId</a></strong>(java.lang.String id)</code>
<div class="block">Set the id attribute for this tag.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#setPageContext(javax.servlet.jsp.PageContext)">setPageContext</a></strong>(<a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a> pageContext)</code>
<div class="block">Set the page context.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#setParent(javax.servlet.jsp.tagext.Tag)">setParent</a></strong>(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> t)</code>
<div class="block">Set the nesting tag of this tag.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../javax/servlet/jsp/tagext/TagSupport.html#setValue(java.lang.String,%20java.lang.Object)">setValue</a></strong>(java.lang.String k,
java.lang.Object o)</code>
<div class="block">Associate a value with a String key.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
</ul>
</li>
</ul>
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<!-- ============ FIELD DETAIL =========== -->
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<h3>Field Detail</h3>
<a name="id">
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<h4>id</h4>
<pre>protected java.lang.String id</pre>
<div class="block">The value of the id attribute of this tag; or null.</div>
</li>
</ul>
<a name="pageContext">
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<h4>pageContext</h4>
<pre>protected transient <a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a> pageContext</pre>
<div class="block">The PageContext.</div>
</li>
</ul>
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<h3>Constructor Detail</h3>
<a name="TagSupport()">
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<h4>TagSupport</h4>
<pre>public TagSupport()</pre>
<div class="block">Default constructor, all subclasses are required to define only
a public constructor with the same signature, and to call the
superclass constructor.
This constructor is called by the code generated by the JSP
translator.</div>
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</li>
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<h3>Method Detail</h3>
<a name="findAncestorWithClass(javax.servlet.jsp.tagext.Tag, java.lang.Class)">
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<h4>findAncestorWithClass</h4>
<pre>public static final <a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> findAncestorWithClass(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> from,
java.lang.Class klass)</pre>
<div class="block">Find the instance of a given class type that is closest to a given
instance.
This method uses the getParent method from the Tag
interface.
This method is used for coordination among cooperating tags.
<p>
The current version of the specification only provides one formal
way of indicating the observable type of a tag handler: its
tag handler implementation class, described in the tag-class
subelement of the tag element. This is extended in an
informal manner by allowing the tag library author to
indicate in the description subelement an observable type.
The type should be a subtype of the tag handler implementation
class or void.
This additional constraint can be exploited by a
specialized container that knows about that specific tag library,
as in the case of the JSP standard tag library.
<p>
When a tag library author provides information on the
observable type of a tag handler, client programmatic code
should adhere to that constraint. Specifically, the Class
passed to findAncestorWithClass should be a subtype of the
observable type.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>from</code> - The instance from where to start looking.</dd><dd><code>klass</code> - The subclass of Tag or interface to be matched</dd>
<dt><span class="strong">Returns:</span></dt><dd>the nearest ancestor that implements the interface
or is an instance of the class specified</dd></dl>
</li>
</ul>
<a name="doStartTag()">
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<li class="blockList">
<h4>doStartTag</h4>
<pre>public int doStartTag()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Default processing of the start tag, returning SKIP_BODY.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doStartTag()">doStartTag</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>SKIP_BODY</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></code> - if an error occurs while processing this tag</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doStartTag()"><code>Tag.doStartTag()</code></a></dd></dl>
</li>
</ul>
<a name="doEndTag()">
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<h4>doEndTag</h4>
<pre>public int doEndTag()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Default processing of the end tag returning EVAL_PAGE.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doEndTag()">doEndTag</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>EVAL_PAGE</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></code> - if an error occurs while processing this tag</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#doEndTag()"><code>Tag.doEndTag()</code></a></dd></dl>
</li>
</ul>
<a name="doAfterBody()">
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<h4>doAfterBody</h4>
<pre>public int doAfterBody()
throws <a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></pre>
<div class="block">Default processing for a body.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html#doAfterBody()">doAfterBody</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html" title="interface in javax.servlet.jsp.tagext">IterationTag</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>SKIP_BODY</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../javax/servlet/jsp/JspException.html" title="class in javax.servlet.jsp">JspException</a></code> - if an error occurs while processing this tag</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/IterationTag.html#doAfterBody()"><code>IterationTag.doAfterBody()</code></a></dd></dl>
</li>
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<a name="release()">
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<h4>release</h4>
<pre>public void release()</pre>
<div class="block">Release state.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#release()">release</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#release()"><code>Tag.release()</code></a></dd></dl>
</li>
</ul>
<a name="setParent(javax.servlet.jsp.tagext.Tag)">
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<h4>setParent</h4>
<pre>public void setParent(<a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> t)</pre>
<div class="block">Set the nesting tag of this tag.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setParent(javax.servlet.jsp.tagext.Tag)">setParent</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>t</code> - The parent Tag.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setParent(javax.servlet.jsp.tagext.Tag)"><code>Tag.setParent(Tag)</code></a></dd></dl>
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<a name="getParent()">
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<h4>getParent</h4>
<pre>public <a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a> getParent()</pre>
<div class="block">The Tag instance most closely enclosing this tag instance.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#getParent()">getParent</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the parent tag instance or null</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#getParent()"><code>Tag.getParent()</code></a></dd></dl>
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<a name="setId(java.lang.String)">
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<h4>setId</h4>
<pre>public void setId(java.lang.String id)</pre>
<div class="block">Set the id attribute for this tag.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>id</code> - The String for the id.</dd></dl>
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<a name="getId()">
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<h4>getId</h4>
<pre>public java.lang.String getId()</pre>
<div class="block">The value of the id attribute of this tag; or null.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the value of the id attribute, or null</dd></dl>
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<h4>setPageContext</h4>
<pre>public void setPageContext(<a href="../../../../javax/servlet/jsp/PageContext.html" title="class in javax.servlet.jsp">PageContext</a> pageContext)</pre>
<div class="block">Set the page context.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setPageContext(javax.servlet.jsp.PageContext)">setPageContext</a></code> in interface <code><a href="../../../../javax/servlet/jsp/tagext/Tag.html" title="interface in javax.servlet.jsp.tagext">Tag</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>pageContext</code> - The PageContext.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../javax/servlet/jsp/tagext/Tag.html#setPageContext(javax.servlet.jsp.PageContext)"><code>Tag.setPageContext(javax.servlet.jsp.PageContext)</code></a></dd></dl>
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<a name="setValue(java.lang.String, java.lang.Object)">
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<h4>setValue</h4>
<pre>public void setValue(java.lang.String k,
java.lang.Object o)</pre>
<div class="block">Associate a value with a String key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>k</code> - The key String.</dd><dd><code>o</code> - The value to associate.</dd></dl>
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<h4>getValue</h4>
<pre>public java.lang.Object getValue(java.lang.String k)</pre>
<div class="block">Get a the value associated with a key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>k</code> - The string key.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The value associated with the key, or null.</dd></dl>
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<h4>removeValue</h4>
<pre>public void removeValue(java.lang.String k)</pre>
<div class="block">Remove a value associated with a key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>k</code> - The string key.</dd></dl>
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<h4>getValues</h4>
<pre>public java.util.Enumeration<java.lang.String> getValues()</pre>
<div class="block">Enumerate the keys for the values kept by this tag handler.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>An enumeration of all the keys for the values set,
or null or an empty Enumeration if no values have been set.</dd></dl>
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