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<h2 title="Class CollectionUtils" class="title">Class CollectionUtils</h2>
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<pre>public class <span class="strong">CollectionUtils</span>
extends java.lang.Object</pre>
<div class="block">A set of helper methods related to collection manipulation.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.EmptyEnumeration.html" title="class in org.apache.tools.ant.util">CollectionUtils.EmptyEnumeration</a></strong></code>
<div class="block">An empty enumeration.</div>
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<td class="colFirst"><code>static java.util.List</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#EMPTY_LIST">EMPTY_LIST</a></strong></code>
<div class="block">Collections.emptyList() is Java5+.</div>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#CollectionUtils()">CollectionUtils</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>static java.util.Enumeration</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#append(java.util.Enumeration, java.util.Enumeration)">append</a></strong>(java.util.Enumeration&nbsp;e1,
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<div class="block">Append one enumeration to another.</div>
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<td class="colFirst"><code>static java.util.Collection</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#asCollection(java.util.Iterator)">asCollection</a></strong>(java.util.Iterator&nbsp;iter)</code>
<div class="block">Returns a collection containing all elements of the iterator.</div>
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<td class="colFirst"><code>static java.util.Enumeration</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#asEnumeration(java.util.Iterator)">asEnumeration</a></strong>(java.util.Iterator&nbsp;iter)</code>
<div class="block">Adapt the specified Iterator to the Enumeration interface.</div>
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<td class="colFirst"><code>static java.util.Iterator</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#asIterator(java.util.Enumeration)">asIterator</a></strong>(java.util.Enumeration&nbsp;e)</code>
<div class="block">Adapt the specified Enumeration to the Iterator interface.</div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#equals(java.util.Dictionary, java.util.Dictionary)">equals</a></strong>(java.util.Dictionary&nbsp;d1,
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<div class="block"><strong>Deprecated.</strong>&nbsp;
<div class="block"><i>since 1.6.x.</i></div>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#equals(java.util.Vector, java.util.Vector)">equals</a></strong>(java.util.Vector&nbsp;v1,
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<div class="block"><i>since 1.6.x.</i></div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#flattenToString(java.util.Collection)">flattenToString</a></strong>(java.util.Collection&nbsp;c)</code>
<div class="block">Creates a comma separated list of all values held in the given
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#frequency(java.util.Collection, java.lang.Object)">frequency</a></strong>(java.util.Collection&nbsp;c,
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<div class="block">Counts how often the given Object occurs in the given
 collection using equals() for comparison.</div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/CollectionUtils.html#putAll(java.util.Dictionary, java.util.Dictionary)">putAll</a></strong>(java.util.Dictionary&nbsp;m1,
      java.util.Dictionary&nbsp;m2)</code>
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<pre>public static final&nbsp;java.util.List EMPTY_LIST</pre>
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<pre>public static&nbsp;boolean&nbsp;equals(java.util.Vector&nbsp;v1,
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<div class="block"><span class="strong">Deprecated.</span>&nbsp;<i>since 1.6.x.</i></div>
<div class="block">Please use Vector.equals() or List.equals().</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>v1</code> - the first vector.</dd><dd><code>v2</code> - the second vector.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the vectors are equal.</dd><dt><span class="strong">Since:</span></dt>
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<pre>public static&nbsp;boolean&nbsp;equals(java.util.Dictionary&nbsp;d1,
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<div class="block"><span class="strong">Deprecated.</span>&nbsp;<i>since 1.6.x.</i></div>
<div class="block">Dictionary does not have an equals.
 Please use  Map.equals().

 <p>Follows the equals contract of Java 2's Map.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>d1</code> - the first directory.</dd><dd><code>d2</code> - the second directory.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if the directories are equal.</dd><dt><span class="strong">Since:</span></dt>
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<pre>public static&nbsp;java.lang.String&nbsp;flattenToString(java.util.Collection&nbsp;c)</pre>
<div class="block">Creates a comma separated list of all values held in the given
 collection.</div>
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<pre>public static&nbsp;void&nbsp;putAll(java.util.Dictionary&nbsp;m1,
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<div class="block"><span class="strong">Deprecated.</span>&nbsp;<i>since 1.6.x.</i></div>
<div class="block">Dictionary does not know the putAll method. Please use Map.putAll().</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>m1</code> - the to directory.</dd><dd><code>m2</code> - the from directory.</dd><dt><span class="strong">Since:</span></dt>
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<pre>public static&nbsp;java.util.Enumeration&nbsp;append(java.util.Enumeration&nbsp;e1,
                           java.util.Enumeration&nbsp;e2)</pre>
<div class="block">Append one enumeration to another.
 Elements are evaluated lazily.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>e1</code> - the first enumeration.</dd><dd><code>e2</code> - the subsequent enumeration.</dd>
<dt><span class="strong">Returns:</span></dt><dd>an enumeration representing e1 followed by e2.</dd><dt><span class="strong">Since:</span></dt>
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<pre>public static&nbsp;java.util.Enumeration&nbsp;asEnumeration(java.util.Iterator&nbsp;iter)</pre>
<div class="block">Adapt the specified Iterator to the Enumeration interface.</div>
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<div class="block">Adapt the specified Enumeration to the Iterator interface.</div>
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<pre>public static&nbsp;int&nbsp;frequency(java.util.Collection&nbsp;c,
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 collection using equals() for comparison.</div>
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