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<div class="subTitle">javafx.beans</div>
<h2 title="Interface Observable" class="title">Interface Observable</h2>
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<dt>All Known Subinterfaces:</dt>
<dd><a href="../../javafx/beans/binding/Binding.html" title="interface in javafx.beans.binding">Binding</a><T>, <a href="../../javafx/beans/property/adapter/JavaBeanProperty.html" title="interface in javafx.beans.property.adapter">JavaBeanProperty</a><T>, <a href="../../javafx/beans/binding/NumberBinding.html" title="interface in javafx.beans.binding">NumberBinding</a>, <a href="../../javafx/beans/binding/NumberExpression.html" title="interface in javafx.beans.binding">NumberExpression</a>, <a href="../../javafx/collections/ObservableArray.html" title="interface in javafx.collections">ObservableArray</a><T>, <a href="../../javafx/beans/value/ObservableBooleanValue.html" title="interface in javafx.beans.value">ObservableBooleanValue</a>, <a href="../../javafx/beans/value/ObservableDoubleValue.html" title="interface in javafx.beans.value">ObservableDoubleValue</a>, <a href="../../javafx/scene/shape/ObservableFaceArray.html" title="interface in javafx.scene.shape">ObservableFaceArray</a>, <a href="../../javafx/collections/ObservableFloatArray.html" title="interface in javafx.collections">ObservableFloatArray</a>, <a href="../../javafx/beans/value/ObservableFloatValue.html" title="interface in javafx.beans.value">ObservableFloatValue</a>, <a href="../../javafx/collections/ObservableIntegerArray.html" title="interface in javafx.collections">ObservableIntegerArray</a>, <a href="../../javafx/beans/value/ObservableIntegerValue.html" title="interface in javafx.beans.value">ObservableIntegerValue</a>, <a href="../../javafx/collections/ObservableList.html" title="interface in javafx.collections">ObservableList</a><E>, <a href="../../javafx/beans/value/ObservableListValue.html" title="interface in javafx.beans.value">ObservableListValue</a><E>, <a href="../../javafx/beans/value/ObservableLongValue.html" title="interface in javafx.beans.value">ObservableLongValue</a>, <a href="../../javafx/collections/ObservableMap.html" title="interface in javafx.collections">ObservableMap</a><K,V>, <a href="../../javafx/beans/value/ObservableMapValue.html" title="interface in javafx.beans.value">ObservableMapValue</a><K,V>, <a href="../../javafx/beans/value/ObservableNumberValue.html" title="interface in javafx.beans.value">ObservableNumberValue</a>, <a href="../../javafx/beans/value/ObservableObjectValue.html" title="interface in javafx.beans.value">ObservableObjectValue</a><T>, <a href="../../javafx/collections/ObservableSet.html" title="interface in javafx.collections">ObservableSet</a><E>, <a href="../../javafx/beans/value/ObservableSetValue.html" title="interface in javafx.beans.value">ObservableSetValue</a><E>, <a href="../../javafx/beans/value/ObservableStringValue.html" title="interface in javafx.beans.value">ObservableStringValue</a>, <a href="../../javafx/beans/value/ObservableValue.html" title="interface in javafx.beans.value">ObservableValue</a><T>, <a href="../../javafx/beans/property/Property.html" title="interface in javafx.beans.property">Property</a><T>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanProperty.html" title="interface in javafx.beans.property.adapter">ReadOnlyJavaBeanProperty</a><T>, <a href="../../javafx/beans/property/ReadOnlyProperty.html" title="interface in javafx.beans.property">ReadOnlyProperty</a><T>, <a href="../../javafx/scene/control/TextInputControl.Content.html" title="interface in javafx.scene.control">TextInputControl.Content</a>, <a href="../../javafx/beans/value/WritableListValue.html" title="interface in javafx.beans.value">WritableListValue</a><E>, <a href="../../javafx/beans/value/WritableMapValue.html" title="interface in javafx.beans.value">WritableMapValue</a><K,V>, <a href="../../javafx/beans/value/WritableSetValue.html" title="interface in javafx.beans.value">WritableSetValue</a><E></dd>
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<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../javafx/beans/binding/BooleanBinding.html" title="class in javafx.beans.binding">BooleanBinding</a>, <a href="../../javafx/beans/binding/BooleanExpression.html" title="class in javafx.beans.binding">BooleanExpression</a>, <a href="../../javafx/beans/property/BooleanProperty.html" title="class in javafx.beans.property">BooleanProperty</a>, <a href="../../javafx/beans/property/BooleanPropertyBase.html" title="class in javafx.beans.property">BooleanPropertyBase</a>, <a href="../../javafx/beans/binding/DoubleBinding.html" title="class in javafx.beans.binding">DoubleBinding</a>, <a href="../../javafx/beans/binding/DoubleExpression.html" title="class in javafx.beans.binding">DoubleExpression</a>, <a href="../../javafx/beans/property/DoubleProperty.html" title="class in javafx.beans.property">DoubleProperty</a>, <a href="../../javafx/beans/property/DoublePropertyBase.html" title="class in javafx.beans.property">DoublePropertyBase</a>, <a href="../../javafx/collections/transformation/FilteredList.html" title="class in javafx.collections.transformation">FilteredList</a>, <a href="../../javafx/beans/binding/FloatBinding.html" title="class in javafx.beans.binding">FloatBinding</a>, <a href="../../javafx/beans/binding/FloatExpression.html" title="class in javafx.beans.binding">FloatExpression</a>, <a href="../../javafx/beans/property/FloatProperty.html" title="class in javafx.beans.property">FloatProperty</a>, <a href="../../javafx/beans/property/FloatPropertyBase.html" title="class in javafx.beans.property">FloatPropertyBase</a>, <a href="../../javafx/beans/binding/IntegerBinding.html" title="class in javafx.beans.binding">IntegerBinding</a>, <a href="../../javafx/beans/binding/IntegerExpression.html" title="class in javafx.beans.binding">IntegerExpression</a>, <a href="../../javafx/beans/property/IntegerProperty.html" title="class in javafx.beans.property">IntegerProperty</a>, <a href="../../javafx/beans/property/IntegerPropertyBase.html" title="class in javafx.beans.property">IntegerPropertyBase</a>, <a href="../../javafx/beans/property/adapter/JavaBeanBooleanProperty.html" title="class in javafx.beans.property.adapter">JavaBeanBooleanProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanDoubleProperty.html" title="class in javafx.beans.property.adapter">JavaBeanDoubleProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanFloatProperty.html" title="class in javafx.beans.property.adapter">JavaBeanFloatProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanIntegerProperty.html" title="class in javafx.beans.property.adapter">JavaBeanIntegerProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanLongProperty.html" title="class in javafx.beans.property.adapter">JavaBeanLongProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanObjectProperty.html" title="class in javafx.beans.property.adapter">JavaBeanObjectProperty</a>, <a href="../../javafx/beans/property/adapter/JavaBeanStringProperty.html" title="class in javafx.beans.property.adapter">JavaBeanStringProperty</a>, <a href="../../javafx/beans/binding/ListBinding.html" title="class in javafx.beans.binding">ListBinding</a>, <a href="../../javafx/beans/binding/ListExpression.html" title="class in javafx.beans.binding">ListExpression</a>, <a href="../../javafx/beans/property/ListProperty.html" title="class in javafx.beans.property">ListProperty</a>, <a href="../../javafx/beans/property/ListPropertyBase.html" title="class in javafx.beans.property">ListPropertyBase</a>, <a href="../../javafx/beans/binding/LongBinding.html" title="class in javafx.beans.binding">LongBinding</a>, <a href="../../javafx/beans/binding/LongExpression.html" title="class in javafx.beans.binding">LongExpression</a>, <a href="../../javafx/beans/property/LongProperty.html" title="class in javafx.beans.property">LongProperty</a>, <a href="../../javafx/beans/property/LongPropertyBase.html" title="class in javafx.beans.property">LongPropertyBase</a>, <a href="../../javafx/beans/binding/MapBinding.html" title="class in javafx.beans.binding">MapBinding</a>, <a href="../../javafx/beans/binding/MapExpression.html" title="class in javafx.beans.binding">MapExpression</a>, <a href="../../javafx/beans/property/MapProperty.html" title="class in javafx.beans.property">MapProperty</a>, <a href="../../javafx/beans/property/MapPropertyBase.html" title="class in javafx.beans.property">MapPropertyBase</a>, <a href="../../javafx/collections/ModifiableObservableListBase.html" title="class in javafx.collections">ModifiableObservableListBase</a>, <a href="../../javafx/beans/binding/NumberExpressionBase.html" title="class in javafx.beans.binding">NumberExpressionBase</a>, <a href="../../javafx/beans/binding/ObjectBinding.html" title="class in javafx.beans.binding">ObjectBinding</a>, <a href="../../javafx/beans/binding/ObjectExpression.html" title="class in javafx.beans.binding">ObjectExpression</a>, <a href="../../javafx/beans/property/ObjectProperty.html" title="class in javafx.beans.property">ObjectProperty</a>, <a href="../../javafx/beans/property/ObjectPropertyBase.html" title="class in javafx.beans.property">ObjectPropertyBase</a>, <a href="../../javafx/collections/ObservableArrayBase.html" title="class in javafx.collections">ObservableArrayBase</a>, <a href="../../javafx/collections/ObservableListBase.html" title="class in javafx.collections">ObservableListBase</a>, <a href="../../javafx/beans/value/ObservableValueBase.html" title="class in javafx.beans.value">ObservableValueBase</a>, <a href="../../javafx/beans/property/ReadOnlyBooleanProperty.html" title="class in javafx.beans.property">ReadOnlyBooleanProperty</a>, <a href="../../javafx/beans/property/ReadOnlyBooleanPropertyBase.html" title="class in javafx.beans.property">ReadOnlyBooleanPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyBooleanWrapper.html" title="class in javafx.beans.property">ReadOnlyBooleanWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyDoubleProperty.html" title="class in javafx.beans.property">ReadOnlyDoubleProperty</a>, <a href="../../javafx/beans/property/ReadOnlyDoublePropertyBase.html" title="class in javafx.beans.property">ReadOnlyDoublePropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyDoubleWrapper.html" title="class in javafx.beans.property">ReadOnlyDoubleWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyFloatProperty.html" title="class in javafx.beans.property">ReadOnlyFloatProperty</a>, <a href="../../javafx/beans/property/ReadOnlyFloatPropertyBase.html" title="class in javafx.beans.property">ReadOnlyFloatPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyFloatWrapper.html" title="class in javafx.beans.property">ReadOnlyFloatWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyIntegerProperty.html" title="class in javafx.beans.property">ReadOnlyIntegerProperty</a>, <a href="../../javafx/beans/property/ReadOnlyIntegerPropertyBase.html" title="class in javafx.beans.property">ReadOnlyIntegerPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyIntegerWrapper.html" title="class in javafx.beans.property">ReadOnlyIntegerWrapper</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanBooleanProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanBooleanProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanDoubleProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanDoubleProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanFloatProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanFloatProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanIntegerProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanIntegerProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanLongProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanLongProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanObjectProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanObjectProperty</a>, <a href="../../javafx/beans/property/adapter/ReadOnlyJavaBeanStringProperty.html" title="class in javafx.beans.property.adapter">ReadOnlyJavaBeanStringProperty</a>, <a href="../../javafx/beans/property/ReadOnlyListProperty.html" title="class in javafx.beans.property">ReadOnlyListProperty</a>, <a href="../../javafx/beans/property/ReadOnlyListPropertyBase.html" title="class in javafx.beans.property">ReadOnlyListPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyListWrapper.html" title="class in javafx.beans.property">ReadOnlyListWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyLongProperty.html" title="class in javafx.beans.property">ReadOnlyLongProperty</a>, <a href="../../javafx/beans/property/ReadOnlyLongPropertyBase.html" title="class in javafx.beans.property">ReadOnlyLongPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyLongWrapper.html" title="class in javafx.beans.property">ReadOnlyLongWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyMapProperty.html" title="class in javafx.beans.property">ReadOnlyMapProperty</a>, <a href="../../javafx/beans/property/ReadOnlyMapPropertyBase.html" title="class in javafx.beans.property">ReadOnlyMapPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyMapWrapper.html" title="class in javafx.beans.property">ReadOnlyMapWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyObjectProperty.html" title="class in javafx.beans.property">ReadOnlyObjectProperty</a>, <a href="../../javafx/beans/property/ReadOnlyObjectPropertyBase.html" title="class in javafx.beans.property">ReadOnlyObjectPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyObjectWrapper.html" title="class in javafx.beans.property">ReadOnlyObjectWrapper</a>, <a href="../../javafx/beans/property/ReadOnlySetProperty.html" title="class in javafx.beans.property">ReadOnlySetProperty</a>, <a href="../../javafx/beans/property/ReadOnlySetPropertyBase.html" title="class in javafx.beans.property">ReadOnlySetPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlySetWrapper.html" title="class in javafx.beans.property">ReadOnlySetWrapper</a>, <a href="../../javafx/beans/property/ReadOnlyStringProperty.html" title="class in javafx.beans.property">ReadOnlyStringProperty</a>, <a href="../../javafx/beans/property/ReadOnlyStringPropertyBase.html" title="class in javafx.beans.property">ReadOnlyStringPropertyBase</a>, <a href="../../javafx/beans/property/ReadOnlyStringWrapper.html" title="class in javafx.beans.property">ReadOnlyStringWrapper</a>, <a href="../../javafx/beans/binding/SetBinding.html" title="class in javafx.beans.binding">SetBinding</a>, <a href="../../javafx/beans/binding/SetExpression.html" title="class in javafx.beans.binding">SetExpression</a>, <a href="../../javafx/beans/property/SetProperty.html" title="class in javafx.beans.property">SetProperty</a>, <a href="../../javafx/beans/property/SetPropertyBase.html" title="class in javafx.beans.property">SetPropertyBase</a>, <a href="../../javafx/beans/property/SimpleBooleanProperty.html" title="class in javafx.beans.property">SimpleBooleanProperty</a>, <a href="../../javafx/beans/property/SimpleDoubleProperty.html" title="class in javafx.beans.property">SimpleDoubleProperty</a>, <a href="../../javafx/beans/property/SimpleFloatProperty.html" title="class in javafx.beans.property">SimpleFloatProperty</a>, <a href="../../javafx/beans/property/SimpleIntegerProperty.html" title="class in javafx.beans.property">SimpleIntegerProperty</a>, <a href="../../javafx/beans/property/SimpleListProperty.html" title="class in javafx.beans.property">SimpleListProperty</a>, <a href="../../javafx/beans/property/SimpleLongProperty.html" title="class in javafx.beans.property">SimpleLongProperty</a>, <a href="../../javafx/beans/property/SimpleMapProperty.html" title="class in javafx.beans.property">SimpleMapProperty</a>, <a href="../../javafx/beans/property/SimpleObjectProperty.html" title="class in javafx.beans.property">SimpleObjectProperty</a>, <a href="../../javafx/beans/property/SimpleSetProperty.html" title="class in javafx.beans.property">SimpleSetProperty</a>, <a href="../../javafx/beans/property/SimpleStringProperty.html" title="class in javafx.beans.property">SimpleStringProperty</a>, <a href="../../javafx/css/SimpleStyleableBooleanProperty.html" title="class in javafx.css">SimpleStyleableBooleanProperty</a>, <a href="../../javafx/css/SimpleStyleableDoubleProperty.html" title="class in javafx.css">SimpleStyleableDoubleProperty</a>, <a href="../../javafx/css/SimpleStyleableFloatProperty.html" title="class in javafx.css">SimpleStyleableFloatProperty</a>, <a href="../../javafx/css/SimpleStyleableIntegerProperty.html" title="class in javafx.css">SimpleStyleableIntegerProperty</a>, <a href="../../javafx/css/SimpleStyleableLongProperty.html" title="class in javafx.css">SimpleStyleableLongProperty</a>, <a href="../../javafx/css/SimpleStyleableObjectProperty.html" title="class in javafx.css">SimpleStyleableObjectProperty</a>, <a href="../../javafx/css/SimpleStyleableStringProperty.html" title="class in javafx.css">SimpleStyleableStringProperty</a>, <a href="../../javafx/collections/transformation/SortedList.html" title="class in javafx.collections.transformation">SortedList</a>, <a href="../../javafx/beans/binding/StringBinding.html" title="class in javafx.beans.binding">StringBinding</a>, <a href="../../javafx/beans/binding/StringExpression.html" title="class in javafx.beans.binding">StringExpression</a>, <a href="../../javafx/beans/property/StringProperty.html" title="class in javafx.beans.property">StringProperty</a>, <a href="../../javafx/beans/property/StringPropertyBase.html" title="class in javafx.beans.property">StringPropertyBase</a>, <a href="../../javafx/css/StyleableBooleanProperty.html" title="class in javafx.css">StyleableBooleanProperty</a>, <a href="../../javafx/css/StyleableDoubleProperty.html" title="class in javafx.css">StyleableDoubleProperty</a>, <a href="../../javafx/css/StyleableFloatProperty.html" title="class in javafx.css">StyleableFloatProperty</a>, <a href="../../javafx/css/StyleableIntegerProperty.html" title="class in javafx.css">StyleableIntegerProperty</a>, <a href="../../javafx/css/StyleableLongProperty.html" title="class in javafx.css">StyleableLongProperty</a>, <a href="../../javafx/css/StyleableObjectProperty.html" title="class in javafx.css">StyleableObjectProperty</a>, <a href="../../javafx/css/StyleableStringProperty.html" title="class in javafx.css">StyleableStringProperty</a>, <a href="../../javafx/collections/transformation/TransformationList.html" title="class in javafx.collections.transformation">TransformationList</a></dd>
</dl>
<hr>
<br>
<pre>public interface <span class="typeNameLabel">Observable</span></pre>
<div class="block">An <code>Observable</code> is an entity that wraps content and allows to
observe the content for invalidations.
<p>
An implementation of <code>Observable</code> may support lazy evaluation,
which means that the content is not immediately recomputed after changes, but
lazily the next time it is requested. All bindings and properties in
this library support lazy evaluation.
<p>
Implementations of this class should strive to generate as few events as
possible to avoid wasting too much time in event handlers. Implementations in
this library mark themselves as invalid when the first invalidation event
occurs. They do not generate anymore invalidation events until their value is
recomputed and valid again.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>JavaFX 2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javafx/beans/value/ObservableValue.html" title="interface in javafx.beans.value"><code>ObservableValue</code></a>,
<a href="../../javafx/collections/ObservableList.html" title="interface in javafx.collections"><code>ObservableList</code></a>,
<a href="../../javafx/collections/ObservableMap.html" title="interface in javafx.collections"><code>ObservableMap</code></a></dd>
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<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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract 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/beans/Observable.html#addListener-javafx.beans.InvalidationListener-">addListener</a></span>(<a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans">InvalidationListener</a> listener)</code>
<div class="block">Adds an <a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans"><code>InvalidationListener</code></a> which will be notified whenever the
<code>Observable</code> becomes invalid.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javafx/beans/Observable.html#removeListener-javafx.beans.InvalidationListener-">removeListener</a></span>(<a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans">InvalidationListener</a> listener)</code>
<div class="block">Removes the given listener from the list of listeners, that are notified
whenever the value of the <code>Observable</code> becomes invalid.</div>
</td>
</tr>
</table>
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<h4>addListener</h4>
<pre>void addListener(<a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans">InvalidationListener</a> listener)</pre>
<div class="block">Adds an <a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans"><code>InvalidationListener</code></a> which will be notified whenever the
<code>Observable</code> becomes invalid. If the same
listener is added more than once, then it will be notified more than
once. That is, no check is made to ensure uniqueness.
<p>
Note that the same actual <code>InvalidationListener</code> instance may be
safely registered for different <code>Observables</code>.
<p>
The <code>Observable</code> stores a strong reference to the listener
which will prevent the listener from being garbage collected and may
result in a memory leak. It is recommended to either unregister a
listener by calling <a href="../../javafx/beans/Observable.html#removeListener-javafx.beans.InvalidationListener-"><code>removeListener</code></a> after use or to use an instance of
<a href="../../javafx/beans/WeakInvalidationListener.html" title="class in javafx.beans"><code>WeakInvalidationListener</code></a> avoid this situation.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>listener</code> - The listener to register</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the listener is null</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javafx/beans/Observable.html#removeListener-javafx.beans.InvalidationListener-"><code>removeListener(InvalidationListener)</code></a></dd>
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<h4>removeListener</h4>
<pre>void removeListener(<a href="../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans">InvalidationListener</a> listener)</pre>
<div class="block">Removes the given listener from the list of listeners, that are notified
whenever the value of the <code>Observable</code> becomes invalid.
<p>
If the given listener has not been previously registered (i.e. it was
never added) then this method call is a no-op. If it had been previously
added then it will be removed. If it had been added more than once, then
only the first occurrence will be removed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>listener</code> - The listener to remove</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the listener is null</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javafx/beans/Observable.html#addListener-javafx.beans.InvalidationListener-"><code>addListener(InvalidationListener)</code></a></dd>
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