<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!-- NewPage --> <html lang="en"> <head> <!-- Generated by javadoc (1.8.0_77) on Fri Apr 22 13:46:18 UTC 2016 --> <title>WeakSetChangeListener (JavaFX 8)</title> <meta name="date" content="2016-04-22"> <link rel="stylesheet" type="text/css" href="../../stylesheet.css" title="Style"> <script type="text/javascript" src="../../script.js"></script> </head> <body> <script type="text/javascript"><!-- try { if (location.href.indexOf('is-external=true') == -1) { parent.document.title="WeakSetChangeListener (JavaFX 8)"; } } catch(err) { } //--> var methods = {"i0":10,"i1":10}; var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],8:["t4","Concrete Methods"]}; var altColor = "altColor"; var rowColor = "rowColor"; var tableTab = "tableTab"; var activeTableTab = "activeTableTab"; </script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript> <!-- ========= START OF TOP NAVBAR ======= --> <div class="topNav"><a name="navbar.top"> <!-- --> </a> <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> <a name="navbar.top.firstrow"> <!-- --> </a> <ul class="navList" title="Navigation"> <li><a href="../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="class-use/WeakSetChangeListener.html">Use</a></li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../deprecated-list.html">Deprecated</a></li> <li><a href="../../index-all.html">Index</a></li> <li><a href="../../help-doc.html">Help</a></li> </ul> <div class="aboutLanguage">JavaFX 8</div> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../javafx/collections/WeakMapChangeListener.html" title="class in javafx.collections"><span class="typeNameLink">Prev Class</span></a></li> <li>Next Class</li> </ul> <ul class="navList"> <li><a href="../../index.html?javafx/collections/WeakSetChangeListener.html" target="_top">Frames</a></li> <li><a href="WeakSetChangeListener.html" target="_top">No Frames</a></li> </ul> <ul class="navList" id="allclasses_navbar_top"> <li><a href="../../allclasses-noframe.html">All Classes</a></li> </ul> <div> <script type="text/javascript"><!-- allClassesLink = document.getElementById("allclasses_navbar_top"); if(window==top) { allClassesLink.style.display = "block"; } else { allClassesLink.style.display = "none"; } //--> </script> </div> <div> <ul class="subNavList"> <li>Summary: </li> <li>Nested | </li> <li>Field | </li> <li><a href="#constructor.summary">Constr</a> | </li> <li><a href="#method.summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li><a href="#constructor.detail">Constr</a> | </li> <li><a href="#method.detail">Method</a></li> </ul> </div> <a name="skip.navbar.top"> <!-- --> </a></div> <!-- ========= END OF TOP NAVBAR ========= --> <!-- ======== START OF CLASS DATA ======== --> <div class="header"> <div class="subTitle">javafx.collections</div> <h2 title="Class WeakSetChangeListener" class="title">Class WeakSetChangeListener<E></h2> </div> <div class="contentContainer"> <ul class="inheritance"> <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> <li> <ul class="inheritance"> <li>javafx.collections.WeakSetChangeListener<E></li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <dl> <dt><span class="paramLabel">Type Parameters:</span></dt> <dd><code>E</code> - The type of the observed value</dd> </dl> <dl> <dt>All Implemented Interfaces:</dt> <dd><a href="../../javafx/beans/WeakListener.html" title="interface in javafx.beans">WeakListener</a>, <a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a><E></dd> </dl> <hr> <br> <pre>public final class <span class="typeNameLabel">WeakSetChangeListener<E></span> extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> implements <a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a><E>, <a href="../../javafx/beans/WeakListener.html" title="interface in javafx.beans">WeakListener</a></pre> <div class="block">A <code>WeakSetChangeListener</code> can be used, if an <a href="../../javafx/collections/ObservableSet.html" title="interface in javafx.collections"><code>ObservableSet</code></a> should only maintain a weak reference to the listener. This helps to avoid memory leaks, that can occur if observers are not unregistered from observed objects after use. <p> <code>WeakSetChangeListener</code> are created by passing in the original <a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections"><code>SetChangeListener</code></a>. The <code>WeakSetChangeListener</code> should then be registered to listen for changes of the observed object. <p> Note: You have to keep a reference to the <code>SetChangeListener</code>, that was passed in as long as it is in use, otherwise it will be garbage collected to soon.</div> <dl> <dt><span class="simpleTagLabel">Since:</span></dt> <dd>JavaFX 2.1</dd> <dt><span class="seeLabel">See Also:</span></dt> <dd><a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections"><code>SetChangeListener</code></a>, <a href="../../javafx/collections/ObservableSet.html" title="interface in javafx.collections"><code>ObservableSet</code></a>, <a href="../../javafx/beans/WeakListener.html" title="interface in javafx.beans"><code>WeakListener</code></a></dd> </dl> </li> </ul> </div> <div class="summary"> <ul class="blockList"> <li class="blockList"> <!-- ======== NESTED CLASS SUMMARY ======== --> <ul class="blockList"> <li class="blockList"><a name="nested.class.summary"> <!-- --> </a> <h3>Nested Class Summary</h3> <ul class="blockList"> <li class="blockList"><a name="nested.classes.inherited.from.class.javafx.collections.SetChangeListener"> <!-- --> </a> <h3>Nested classes/interfaces inherited from interface javafx.collections.<a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a></h3> <code><a href="../../javafx/collections/SetChangeListener.Change.html" title="class in javafx.collections">SetChangeListener.Change</a><<a href="../../javafx/collections/SetChangeListener.Change.html" title="type parameter in SetChangeListener.Change">E</a>></code></li> </ul> </li> </ul> <!-- ======== CONSTRUCTOR SUMMARY ======== --> <ul class="blockList"> <li class="blockList"><a name="constructor.summary"> <!-- --> </a> <h3>Constructor Summary</h3> <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> <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><span class="memberNameLink"><a href="../../javafx/collections/WeakSetChangeListener.html#WeakSetChangeListener-javafx.collections.SetChangeListener-">WeakSetChangeListener</a></span>(<a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a><<a href="../../javafx/collections/WeakSetChangeListener.html" title="type parameter in WeakSetChangeListener">E</a>> listener)</code> <div class="block">The constructor of <code>WeakSetChangeListener</code>.</div> </td> </tr> </table> </li> </ul> <!-- ========== METHOD SUMMARY =========== --> <ul class="blockList"> <li class="blockList"><a name="method.summary"> <!-- --> </a> <h3>Method Summary</h3> <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance 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="colLast" scope="col">Method and Description</th> </tr> <tr id="i0" class="altColor"> <td class="colFirst"><code>void</code></td> <td class="colLast"><code><span class="memberNameLink"><a href="../../javafx/collections/WeakSetChangeListener.html#onChanged-javafx.collections.SetChangeListener.Change-">onChanged</a></span>(<a href="../../javafx/collections/SetChangeListener.Change.html" title="class in javafx.collections">SetChangeListener.Change</a><? extends <a href="../../javafx/collections/WeakSetChangeListener.html" title="type parameter in WeakSetChangeListener">E</a>> change)</code> <div class="block">Called after a change has been made to an ObservableSet.</div> </td> </tr> <tr id="i1" class="rowColor"> <td class="colFirst"><code>boolean</code></td> <td class="colLast"><code><span class="memberNameLink"><a href="../../javafx/collections/WeakSetChangeListener.html#wasGarbageCollected--">wasGarbageCollected</a></span>()</code> <div class="block">Returns <code>true</code> if the linked listener was garbage-collected.</div> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> <!-- --> </a> <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> </ul> </li> </ul> </li> </ul> </div> <div class="details"> <ul class="blockList"> <li class="blockList"> <!-- ========= CONSTRUCTOR DETAIL ======== --> <ul class="blockList"> <li class="blockList"><a name="constructor.detail"> <!-- --> </a> <h3>Constructor Detail</h3> <a name="WeakSetChangeListener-javafx.collections.SetChangeListener-"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>WeakSetChangeListener</h4> <pre>public WeakSetChangeListener(<a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a><<a href="../../javafx/collections/WeakSetChangeListener.html" title="type parameter in WeakSetChangeListener">E</a>> listener)</pre> <div class="block">The constructor of <code>WeakSetChangeListener</code>.</div> <dl> <dt><span class="paramLabel">Parameters:</span></dt> <dd><code>listener</code> - The original listener that should be notified</dd> </dl> </li> </ul> </li> </ul> <!-- ============ METHOD DETAIL ========== --> <ul class="blockList"> <li class="blockList"><a name="method.detail"> <!-- --> </a> <h3>Method Detail</h3> <a name="wasGarbageCollected--"> <!-- --> </a> <ul class="blockList"> <li class="blockList"> <h4>wasGarbageCollected</h4> <pre>public boolean wasGarbageCollected()</pre> <div class="block">Returns <code>true</code> if the linked listener was garbage-collected. In this case, the listener can be removed from the observable.</div> <dl> <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> <dd><code><a href="../../javafx/beans/WeakListener.html#wasGarbageCollected--">wasGarbageCollected</a></code> in interface <code><a href="../../javafx/beans/WeakListener.html" title="interface in javafx.beans">WeakListener</a></code></dd> <dt><span class="returnLabel">Returns:</span></dt> <dd><code>true</code> if the linked listener was garbage-collected.</dd> </dl> </li> </ul> <a name="onChanged-javafx.collections.SetChangeListener.Change-"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>onChanged</h4> <pre>public void onChanged(<a href="../../javafx/collections/SetChangeListener.Change.html" title="class in javafx.collections">SetChangeListener.Change</a><? extends <a href="../../javafx/collections/WeakSetChangeListener.html" title="type parameter in WeakSetChangeListener">E</a>> change)</pre> <div class="block">Called after a change has been made to an ObservableSet. This method is called on every elementary change (add/remove) once. This means, complex changes like removeAll(Collection) or clear() may result in more than one call of onChanged method.</div> <dl> <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> <dd><code><a href="../../javafx/collections/SetChangeListener.html#onChanged-javafx.collections.SetChangeListener.Change-">onChanged</a></code> in interface <code><a href="../../javafx/collections/SetChangeListener.html" title="interface in javafx.collections">SetChangeListener</a><<a href="../../javafx/collections/WeakSetChangeListener.html" title="type parameter in WeakSetChangeListener">E</a>></code></dd> <dt><span class="paramLabel">Parameters:</span></dt> <dd><code>change</code> - the change that was made</dd> </dl> </li> </ul> </li> </ul> </li> </ul> </div> </div> <!-- ========= END OF CLASS DATA ========= --> <!-- ======= START OF BOTTOM NAVBAR ====== --> <div class="bottomNav"><a name="navbar.bottom"> <!-- --> </a> <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> <a name="navbar.bottom.firstrow"> <!-- --> </a> <ul class="navList" title="Navigation"> <li><a href="../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="class-use/WeakSetChangeListener.html">Use</a></li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../deprecated-list.html">Deprecated</a></li> <li><a href="../../index-all.html">Index</a></li> <li><a href="../../help-doc.html">Help</a></li> </ul> <div class="aboutLanguage">JavaFX 8</div> </div> <div class="subNav"> <ul class="navList"> <li><a href="../../javafx/collections/WeakMapChangeListener.html" title="class in javafx.collections"><span class="typeNameLink">Prev Class</span></a></li> <li>Next Class</li> </ul> <ul class="navList"> <li><a href="../../index.html?javafx/collections/WeakSetChangeListener.html" target="_top">Frames</a></li> <li><a href="WeakSetChangeListener.html" target="_top">No Frames</a></li> </ul> <ul class="navList" id="allclasses_navbar_bottom"> <li><a href="../../allclasses-noframe.html">All Classes</a></li> </ul> <div> <script type="text/javascript"><!-- allClassesLink = document.getElementById("allclasses_navbar_bottom"); if(window==top) { allClassesLink.style.display = "block"; } else { allClassesLink.style.display = "none"; } //--> </script> </div> <div> <ul class="subNavList"> <li>Summary: </li> <li>Nested | </li> <li>Field | </li> <li><a href="#constructor.summary">Constr</a> | </li> <li><a href="#method.summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li><a href="#constructor.detail">Constr</a> | </li> <li><a href="#method.detail">Method</a></li> </ul> </div> <a name="skip.navbar.bottom"> <!-- --> </a></div> <!-- ======== END OF BOTTOM NAVBAR ======= --> <p class="legalCopy"><small><small><a href="https://docs.oracle.com/javase/8/docs/legal/cpyr.html">Copyright</a> (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.</small></small></p> </body> </html>