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 <h2 title="Class WeakHashSet" class="title">Class WeakHashSet&lt;E&gt;</h2>
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 <pre>public class <span class="typeNameLabel">WeakHashSet&lt;E&gt;</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractSet.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractSet</a>&lt;E&gt;
 implements <a href="CheckedContainer.html" title="interface in org.apache.sis.util.collection">CheckedContainer</a>&lt;E&gt;</pre>
 <div class="block">A set of objects hold by weak references. An entry in a <code>WeakHashSet</code> will automatically
  be removed when it is no longer in ordinary use. More precisely, the presence of an entry will
  not prevent the entry from being discarded by the garbage collector, that is, made finalizable,
  finalized, and then reclaimed. When an entry has been discarded it is effectively removed from
  the set, so this class behaves somewhat differently than other <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Set</code></a> implementations.

  <p>If the elements stored in this set are arrays like <code>int[]</code>, <code>float[]</code> or
  <code>Object[]</code>, then the hash code computations and the comparisons are performed using
  the static <code>hashCode(a)</code> and <code>equals(a1, a2)</code> methods defined in the <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Arrays</code></a>
  class.</p>

  <div class="section">Optimizing memory use in factory implementations</div>
  The <code>WeakHashSet</code> class has a <a href="#get(java.lang.Object)"><code>get(Object)</code></a> method that is not part of the
  <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>Set</code></a> interface. This <code>get</code> method retrieves an entry from this set
  that is equals to the supplied object. The <a href="#unique(T)"><code>unique(Object)</code></a> method combines a
  <code>get</code> followed by a <code>add</code> operation if the specified object was not in the set.
  This is similar in spirit to the <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true#intern()" title="class or interface in java.lang" class="externalLink"><code>String.intern()</code></a> method. The following example shows
  a convenient way to use <code>WeakHashSet</code> as an internal pool of immutable objects:

  <blockquote><pre><font color="green">private</font> <font color="green">final</font> WeakHashSet&lt;Foo&gt; pool = <font color="green">new</font> WeakHashSet&lt;Foo&gt;(Foo.<font color="green">class</font>);

 <font color="green">public</font> Foo <b>create</b>(String definition) {
     Foo created = <font color="green">new</font> <b>Foo</b>(definition);
     <font color="green">return</font> pool.<b>unique</b>(created);
 }</pre></blockquote>

  Thus, <code>WeakHashSet</code> can be used inside a factory to prevent creating duplicate immutable objects.

  <div class="section">Thread safety</div>
  The same <code>WeakHashSet</code> instance can be safely used by many threads without synchronization on the part of
  the caller. But if a sequence of two or more method calls need to appear atomic from other threads perspective,
  then the caller can synchronize on <code>this</code>.</div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.3</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/util/WeakHashMap.html?is-external=true" title="class or interface in java.util" class="externalLink"><code>WeakHashMap</code></a></dd>

 <p><font size="-1">Defined in the <code>sis-utility</code> module</font></p>
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 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.Class)">WeakHashSet</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;&nbsp;type)</code></th>
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 <td class="colFirst"><code>boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#add(E)">add</a></span>&#8203;(<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&nbsp;element)</code></th>
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 <div class="block">Adds the specified element to this set if it is not already present.</div>
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 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clear()">clear</a></span>()</code></th>
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 <div class="block">Removes all of the elements from this set.</div>
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 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#contains(java.lang.Object)">contains</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</code></th>
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 <div class="block">Returns <code>true</code> if this set contains the specified element.</div>
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 <td class="colFirst"><code><a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get(java.lang.Object)">get</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</code></th>
 <td class="colLast">
 <div class="block">Returns an object equals to the specified object, if present.</div>
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 <div class="block">Returns the type of elements in this set.</div>
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 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util" class="externalLink">Iterator</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#iterator()">iterator</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns an iterator over the elements contained in this collection.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#remove(java.lang.Object)">remove</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</code></th>
 <td class="colLast">
 <div class="block">Removes a single instance of the specified element from this set, if it is present
  Null values are considered never present.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#size()">size</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the count of element in this set.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code><a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>[]</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toArray()">toArray</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns a view of this set as an array.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>&lt;T extends <a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;<br>T</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unique(T)">unique</a></span>&#8203;(T&nbsp;element)</code></th>
 <td class="colLast">
 <div class="block">Returns an object equals to <code>element</code> if such an object already exist in this
  <code>WeakHashSet</code>.</div>
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 <code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#addAll(java.util.Collection)" title="class or interface in java.util" class="externalLink">addAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#containsAll(java.util.Collection)" title="class or interface in java.util" class="externalLink">containsAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#isEmpty()" title="class or interface in java.util" class="externalLink">isEmpty</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#retainAll(java.util.Collection)" title="class or interface in java.util" class="externalLink">retainAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#spliterator()" title="class or interface in java.util" class="externalLink">spliterator</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#toArray(T%5B%5D)" title="class or interface in java.util" class="externalLink">toArray</a></code></li>
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 <h4>WeakHashSet</h4>
 <pre>public&nbsp;WeakHashSet&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;&nbsp;type)</pre>
 <div class="block">Creates a <code>WeakHashSet</code> for elements of the specified type.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>type</code> - the type of the element to be included in this set.</dd>
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 <pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;&nbsp;getElementType()</pre>
 <div class="block">Returns the type of elements in this set.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="CheckedContainer.html#getElementType()">getElementType</a></code>&nbsp;in interface&nbsp;<code><a href="CheckedContainer.html" title="interface in org.apache.sis.util.collection">CheckedContainer</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the element type.</dd>
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 <pre class="methodSignature">public&nbsp;int&nbsp;size()</pre>
 <div class="block">Returns the count of element in this set.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#size()" title="class or interface in java.util" class="externalLink">size</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#size()" title="class or interface in java.util" class="externalLink">size</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#size()" title="class or interface in java.util" class="externalLink">size</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>number of elements in this set.</dd>
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 <pre class="methodSignature">public&nbsp;boolean&nbsp;add&#8203;(<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&nbsp;element)
             throws <a href="../NullArgumentException.html" title="class in org.apache.sis.util">NullArgumentException</a></pre>
 <div class="block">Adds the specified element to this set if it is not already present.
  If this set already contains the specified element, the call leaves
  this set unchanged and returns <code>false</code>.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#add(E)" title="class or interface in java.util" class="externalLink">add</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#add(E)" title="class or interface in java.util" class="externalLink">add</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#add(E)" title="class or interface in java.util" class="externalLink">add</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>element</code> - element to be added to this set.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> if this set did not already contain the specified element.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../NullArgumentException.html" title="class in org.apache.sis.util">NullArgumentException</a></code> - if the given object is <code>null</code>.</dd>
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 <pre class="methodSignature">public&nbsp;boolean&nbsp;remove&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</pre>
 <div class="block">Removes a single instance of the specified element from this set, if it is present
  Null values are considered never present.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#remove(java.lang.Object)" title="class or interface in java.util" class="externalLink">remove</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#remove(java.lang.Object)" title="class or interface in java.util" class="externalLink">remove</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#remove(java.lang.Object)" title="class or interface in java.util" class="externalLink">remove</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>element</code> - element to be removed from this set, if present. Can be <code>null</code>.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> if the set contained the specified element.</dd>
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 <h4>get</h4>
 <pre class="methodSignature">public&nbsp;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&nbsp;get&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</pre>
 <div class="block">Returns an object equals to the specified object, if present. If this set doesn't
  contain any object equals to <code>element</code>, then this method returns <code>null</code>.
  Null values are considered never present.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>element</code> - the element to get.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>an element equals to the given one if already presents in the set,
          or <code>null</code> otherwise.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="#unique(T)"><code>unique(Object)</code></a></dd>
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 <pre class="methodSignature">public&nbsp;boolean&nbsp;contains&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;element)</pre>
 <div class="block">Returns <code>true</code> if this set contains the specified element.
  Null values are considered never present.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#contains(java.lang.Object)" title="class or interface in java.util" class="externalLink">contains</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#contains(java.lang.Object)" title="class or interface in java.util" class="externalLink">contains</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#contains(java.lang.Object)" title="class or interface in java.util" class="externalLink">contains</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>element</code> - object to be checked for containment in this set. Can be <code>null</code>.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> if this set contains the specified element.</dd>
 </dl>
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 <pre class="methodSignature">public&nbsp;&lt;T extends <a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;&nbsp;T&nbsp;unique&#8203;(T&nbsp;element)</pre>
 <div class="block">Returns an object equals to <code>element</code> if such an object already exist in this
  <code>WeakHashSet</code>. Otherwise, adds <code>element</code> to this <code>WeakHashSet</code>.
  This method is functionally equivalents to the following code:

  <blockquote><pre><font color="green">if</font> (element != <font color="green">null</font>) {
     T current = <b>get</b>(element);
     <font color="green">if</font> (current != <font color="green">null</font>) {
         <font color="green">return</font> current;
     } <font color="green">else</font> {
         <b>add</b>(element);
     }
 }
 <font color="green">return</font> element;</pre></blockquote></div>
 <dl>
 <dt><span class="paramLabel">Type Parameters:</span></dt>
 <dd><code>T</code> - the type of the element to get. Can be <code>null</code>.</dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>element</code> - the element to get or to add in the set if not already presents,
                   or <code>null</code> if the given element was null.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>an element equals to the given one if already presents in the set,
          or the given <code>object</code> otherwise.</dd>
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 <pre class="methodSignature">public&nbsp;void&nbsp;clear()</pre>
 <div class="block">Removes all of the elements from this set.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#clear()" title="class or interface in java.util" class="externalLink">clear</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#clear()" title="class or interface in java.util" class="externalLink">clear</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#clear()" title="class or interface in java.util" class="externalLink">clear</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
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 <pre class="methodSignature">public&nbsp;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>[]&nbsp;toArray()</pre>
 <div class="block">Returns a view of this set as an array. Elements will be in an arbitrary
  order. Note that this array contains strong references. Consequently, no
  object reclamation will occur as long as a reference to this array is hold.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#toArray()" title="class or interface in java.util" class="externalLink">toArray</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#toArray()" title="class or interface in java.util" class="externalLink">toArray</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#toArray()" title="class or interface in java.util" class="externalLink">toArray</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>all elements in this set.</dd>
 </dl>
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 <h4>iterator</h4>
 <pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util" class="externalLink">Iterator</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;&nbsp;iterator()</pre>
 <div class="block">Returns an iterator over the elements contained in this collection.
  No element from this set will be garbage collected as long as a
  reference to the iterator is hold.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true#iterator()" title="class or interface in java.util" class="externalLink">iterator</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#iterator()" title="class or interface in java.lang" class="externalLink">iterator</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Iterable</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true#iterator()" title="class or interface in java.util" class="externalLink">iterator</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util" class="externalLink">Set</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true#iterator()" title="class or interface in java.util" class="externalLink">iterator</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/AbstractCollection.html?is-external=true" title="class or interface in java.util" class="externalLink">AbstractCollection</a>&lt;<a href="WeakHashSet.html" title="type parameter in WeakHashSet">E</a>&gt;</code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>an iterator over all elements in this set.</dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
 </section>
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