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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.eclipse.jetty.util</a></div> |
| <h2 title="Class LazyList" class="title">Class LazyList</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.eclipse.jetty.util.LazyList</li> |
| </ul> |
| </li> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.io.Serializable</code>, <code>java.lang.Cloneable</code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">LazyList</span> |
| extends java.lang.Object |
| implements java.lang.Cloneable, java.io.Serializable</pre> |
| <div class="block">Lazy List creation. |
| <p> |
| A List helper class that attempts to avoid unnecessary List |
| creation. If a method needs to create a List to return, but it is |
| expected that this will either be empty or frequently contain a |
| single item, then using LazyList will avoid additional object |
| creations by using <code>Collections.EMPTY_LIST</code> or |
| <code>Collections.singletonList(Object)</code> where possible. |
| </p> |
| <p> |
| LazyList works by passing an opaque representation of the list in |
| and out of all the LazyList methods. This opaque object is either |
| null for an empty list, an Object for a list with a single entry |
| or an <code>ArrayList</code> for a list of items. |
| </p> |
| <strong>Usage</strong> |
| <pre> |
| Object lazylist =null; |
| while(loopCondition) |
| { |
| Object item = getItem(); |
| if (item.isToBeAdded()) |
| lazylist = LazyList.add(lazylist,item); |
| } |
| return LazyList.getList(lazylist); |
| </pre> |
| |
| An ArrayList of default size is used as the initial LazyList.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>List</code>, |
| <a href="../../../../serialized-form.html#org.eclipse.jetty.util.LazyList">Serialized Form</a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#add(java.lang.Object,int,java.lang.Object)">add</a></span>​(java.lang.Object list, |
| int index, |
| java.lang.Object item)</code></th> |
| <td class="colLast"> |
| <div class="block">Add an item to a LazyList</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#add(java.lang.Object,java.lang.Object)">add</a></span>​(java.lang.Object list, |
| java.lang.Object item)</code></th> |
| <td class="colLast"> |
| <div class="block">Add an item to a LazyList</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addArray(java.lang.Object,java.lang.Object%5B%5D)">addArray</a></span>​(java.lang.Object list, |
| java.lang.Object[] array)</code></th> |
| <td class="colLast"> |
| <div class="block">Add the contents of an array to a LazyList</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addCollection(java.lang.Object,java.util.Collection)">addCollection</a></span>​(java.lang.Object list, |
| java.util.Collection<?> collection)</code></th> |
| <td class="colLast"> |
| <div class="block">Add the contents of a Collection to a LazyList</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clone(java.lang.Object)">clone</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#contains(java.lang.Object,java.lang.Object)">contains</a></span>​(java.lang.Object list, |
| java.lang.Object item)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ensureSize(java.lang.Object,int)">ensureSize</a></span>​(java.lang.Object list, |
| int initialSize)</code></th> |
| <td class="colLast"> |
| <div class="block">Ensure the capacity of the underlying list.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static <E> E</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get(java.lang.Object,int)">get</a></span>​(java.lang.Object list, |
| int i)</code></th> |
| <td class="colLast"> |
| <div class="block">Get item from the list</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static <E> java.util.List<E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getList(java.lang.Object)">getList</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> |
| <div class="block">Get the real List from a LazyList.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static <E> java.util.List<E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getList(java.lang.Object,boolean)">getList</a></span>​(java.lang.Object list, |
| boolean nullForEmpty)</code></th> |
| <td class="colLast"> |
| <div class="block">Get the real List from a LazyList.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hasEntry(java.lang.Object)">hasEntry</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> |
| <div class="block">Simple utility method to test if List has at least 1 entry.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isEmpty(java.lang.Object)">isEmpty</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> |
| <div class="block">Simple utility method to test if List is empty</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>static <E> java.util.Iterator<E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#iterator(java.lang.Object)">iterator</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>static <E> java.util.ListIterator<E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#listIterator(java.lang.Object)">listIterator</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#remove(java.lang.Object,int)">remove</a></span>​(java.lang.Object list, |
| int i)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#remove(java.lang.Object,java.lang.Object)">remove</a></span>​(java.lang.Object list, |
| java.lang.Object o)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#size(java.lang.Object)">size</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> |
| <div class="block">The size of a lazy List</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toArray(java.lang.Object,java.lang.Class)">toArray</a></span>​(java.lang.Object list, |
| java.lang.Class<?> clazz)</code></th> |
| <td class="colLast"> |
| <div class="block">Convert a lazylist to an array</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>static java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString(java.lang.Object)">toString</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i19" class="rowColor"> |
| <td class="colFirst"><code>static java.lang.String[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toStringArray(java.lang.Object)">toStringArray</a></span>​(java.lang.Object list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <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> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="add(java.lang.Object,java.lang.Object)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>add</h4> |
| <pre class="methodSignature">public static java.lang.Object add​(java.lang.Object list, |
| java.lang.Object item)</pre> |
| <div class="block">Add an item to a LazyList</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to add to or null if none yet created.</dd> |
| <dd><code>item</code> - The item to add.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The lazylist created or added to.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="add(java.lang.Object,int,java.lang.Object)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>add</h4> |
| <pre class="methodSignature">public static java.lang.Object add​(java.lang.Object list, |
| int index, |
| java.lang.Object item)</pre> |
| <div class="block">Add an item to a LazyList</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to add to or null if none yet created.</dd> |
| <dd><code>index</code> - The index to add the item at.</dd> |
| <dd><code>item</code> - The item to add.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The lazylist created or added to.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="addCollection(java.lang.Object,java.util.Collection)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addCollection</h4> |
| <pre class="methodSignature">public static java.lang.Object addCollection​(java.lang.Object list, |
| java.util.Collection<?> collection)</pre> |
| <div class="block">Add the contents of a Collection to a LazyList</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to add to or null if none yet created.</dd> |
| <dd><code>collection</code> - The Collection whose contents should be added.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The lazylist created or added to.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="addArray(java.lang.Object,java.lang.Object[])"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addArray</h4> |
| <pre class="methodSignature">public static java.lang.Object addArray​(java.lang.Object list, |
| java.lang.Object[] array)</pre> |
| <div class="block">Add the contents of an array to a LazyList</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to add to or null if none yet created.</dd> |
| <dd><code>array</code> - The array whose contents should be added.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The lazylist created or added to.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="ensureSize(java.lang.Object,int)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ensureSize</h4> |
| <pre class="methodSignature">public static java.lang.Object ensureSize​(java.lang.Object list, |
| int initialSize)</pre> |
| <div class="block">Ensure the capacity of the underlying list.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - the list to grow</dd> |
| <dd><code>initialSize</code> - the size to grow to</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the new List with new size</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="remove(java.lang.Object,java.lang.Object)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>remove</h4> |
| <pre class="methodSignature">public static java.lang.Object remove​(java.lang.Object list, |
| java.lang.Object o)</pre> |
| </li> |
| </ul> |
| <a id="remove(java.lang.Object,int)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>remove</h4> |
| <pre class="methodSignature">public static java.lang.Object remove​(java.lang.Object list, |
| int i)</pre> |
| </li> |
| </ul> |
| <a id="getList(java.lang.Object)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getList</h4> |
| <pre class="methodSignature">public static <E> java.util.List<E> getList​(java.lang.Object list)</pre> |
| <div class="block">Get the real List from a LazyList.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>E</code> - the list entry type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - A LazyList returned from LazyList.add(Object)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The List of added items, which may be an EMPTY_LIST |
| or a SingletonList.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getList(java.lang.Object,boolean)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getList</h4> |
| <pre class="methodSignature">public static <E> java.util.List<E> getList​(java.lang.Object list, |
| boolean nullForEmpty)</pre> |
| <div class="block">Get the real List from a LazyList.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>E</code> - the list entry type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - A LazyList returned from LazyList.add(Object) or null</dd> |
| <dd><code>nullForEmpty</code> - If true, null is returned instead of an |
| empty list.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The List of added items, which may be null, an EMPTY_LIST |
| or a SingletonList.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="hasEntry(java.lang.Object)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hasEntry</h4> |
| <pre class="methodSignature">public static boolean hasEntry​(java.lang.Object list)</pre> |
| <div class="block">Simple utility method to test if List has at least 1 entry.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - a LazyList, <code>List</code> or <code>Object</code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if not-null and is not empty</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="isEmpty(java.lang.Object)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isEmpty</h4> |
| <pre class="methodSignature">public static boolean isEmpty​(java.lang.Object list)</pre> |
| <div class="block">Simple utility method to test if List is empty</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - a LazyList, <code>List</code> or <code>Object</code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if null or is empty</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="toStringArray(java.lang.Object)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toStringArray</h4> |
| <pre class="methodSignature">public static java.lang.String[] toStringArray​(java.lang.Object list)</pre> |
| </li> |
| </ul> |
| <a id="toArray(java.lang.Object,java.lang.Class)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toArray</h4> |
| <pre class="methodSignature">public static java.lang.Object toArray​(java.lang.Object list, |
| java.lang.Class<?> clazz)</pre> |
| <div class="block">Convert a lazylist to an array</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to convert</dd> |
| <dd><code>clazz</code> - The class of the array, which may be a primitive type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>array of the lazylist entries passed in</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="size(java.lang.Object)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>size</h4> |
| <pre class="methodSignature">public static int size​(java.lang.Object list)</pre> |
| <div class="block">The size of a lazy List</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - A LazyList returned from LazyList.add(Object) or null</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the size of the list.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="get(java.lang.Object,int)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>get</h4> |
| <pre class="methodSignature">public static <E> E get​(java.lang.Object list, |
| int i)</pre> |
| <div class="block">Get item from the list</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>E</code> - the list entry type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - A LazyList returned from LazyList.add(Object) or null</dd> |
| <dd><code>i</code> - int index</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the item from the list.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="contains(java.lang.Object,java.lang.Object)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>contains</h4> |
| <pre class="methodSignature">public static boolean contains​(java.lang.Object list, |
| java.lang.Object item)</pre> |
| </li> |
| </ul> |
| <a id="clone(java.lang.Object)"> |
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| </a> |
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| <h4>clone</h4> |
| <pre class="methodSignature">public static java.lang.Object clone​(java.lang.Object list)</pre> |
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| <a id="toString(java.lang.Object)"> |
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| </a> |
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| <li class="blockList"> |
| <h4>toString</h4> |
| <pre class="methodSignature">public static java.lang.String toString​(java.lang.Object list)</pre> |
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| </ul> |
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| </a> |
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| <h4>iterator</h4> |
| <pre class="methodSignature">public static <E> java.util.Iterator<E> iterator​(java.lang.Object list)</pre> |
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| <h4>listIterator</h4> |
| <pre class="methodSignature">public static <E> java.util.ListIterator<E> listIterator​(java.lang.Object list)</pre> |
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