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<div class="subTitle">javafx.beans.value</div>
<h2 title="Interface ObservableValue" class="title">Interface ObservableValue<T></h2>
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<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The type of the wrapped value.</dd>
</dl>
<dl>
<dt>All Superinterfaces:</dt>
<dd><a href="../../../javafx/beans/Observable.html" title="interface in javafx.beans">Observable</a></dd>
</dl>
<dl>
<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/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/beans/value/ObservableFloatValue.html" title="interface in javafx.beans.value">ObservableFloatValue</a>, <a href="../../../javafx/beans/value/ObservableIntegerValue.html" title="interface in javafx.beans.value">ObservableIntegerValue</a>, <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/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/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/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></dd>
</dl>
<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/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/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/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/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></dd>
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<br>
<pre>public interface <span class="typeNameLabel">ObservableValue<T></span>
extends <a href="../../../javafx/beans/Observable.html" title="interface in javafx.beans">Observable</a></pre>
<div class="block">An <code>ObservableValue</code> is an entity that wraps a value and allows to
observe the value for changes. In general this interface should not be
implemented directly but one of its sub-interfaces (
<code>ObservableBooleanValue</code> etc.).
<p>
The value of the <code>ObservableValue</code> can be requested with
<a href="../../../javafx/beans/value/ObservableValue.html#getValue--"><code>getValue()</code></a>.
<p>
An implementation of <code>ObservableValue</code> may support lazy evaluation,
which means that the value is not immediately recomputed after changes, but
lazily the next time the value is requested. All bindings and properties in
this library support lazy evaluation.
<p>
An <code>ObservableValue</code> generates two types of events: change events and
invalidation events. A change event indicates that the value has changed. An
invalidation event is generated, if the current value is not valid anymore.
This distinction becomes important, if the <code>ObservableValue</code> supports
lazy evaluation, because for a lazily evaluated value one does not know if an
invalid value really has changed until it is recomputed. For this reason,
generating change events requires eager evaluation while invalidation events
can be generated for eager and lazy implementations.
<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.
<p>
Two types of listeners can be attached to an <code>ObservableValue</code>:
<a href="../../../javafx/beans/InvalidationListener.html" title="interface in javafx.beans"><code>InvalidationListener</code></a> to listen to invalidation events and
<a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value"><code>ChangeListener</code></a> to listen to change events.
<p>
Important note: attaching a <code>ChangeListener</code> enforces eager computation
even if the implementation of the <code>ObservableValue</code> supports lazy
evaluation.</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/ObservableBooleanValue.html" title="interface in javafx.beans.value"><code>ObservableBooleanValue</code></a>,
<a href="../../../javafx/beans/value/ObservableDoubleValue.html" title="interface in javafx.beans.value"><code>ObservableDoubleValue</code></a>,
<a href="../../../javafx/beans/value/ObservableFloatValue.html" title="interface in javafx.beans.value"><code>ObservableFloatValue</code></a>,
<a href="../../../javafx/beans/value/ObservableIntegerValue.html" title="interface in javafx.beans.value"><code>ObservableIntegerValue</code></a>,
<a href="../../../javafx/beans/value/ObservableLongValue.html" title="interface in javafx.beans.value"><code>ObservableLongValue</code></a>,
<a href="../../../javafx/beans/value/ObservableNumberValue.html" title="interface in javafx.beans.value"><code>ObservableNumberValue</code></a>,
<a href="../../../javafx/beans/value/ObservableObjectValue.html" title="interface in javafx.beans.value"><code>ObservableObjectValue</code></a>,
<a href="../../../javafx/beans/value/ObservableStringValue.html" title="interface in javafx.beans.value"><code>ObservableStringValue</code></a></dd>
</dl>
</li>
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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/value/ObservableValue.html#addListener-javafx.beans.value.ChangeListener-">addListener</a></span>(<a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value">ChangeListener</a><? super <a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a>> listener)</code>
<div class="block">Adds a <a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value"><code>ChangeListener</code></a> which will be notified whenever the value
of the <code>ObservableValue</code> changes.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javafx/beans/value/ObservableValue.html#getValue--">getValue</a></span>()</code>
<div class="block">Returns the current value of this <code>ObservableValue</code></div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javafx/beans/value/ObservableValue.html#removeListener-javafx.beans.value.ChangeListener-">removeListener</a></span>(<a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value">ChangeListener</a><? super <a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a>> listener)</code>
<div class="block">Removes the given listener from the list of listeners, that are notified
whenever the value of the <code>ObservableValue</code> changes.</div>
</td>
</tr>
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<h3>Methods inherited from interface javafx.beans.<a href="../../../javafx/beans/Observable.html" title="interface in javafx.beans">Observable</a></h3>
<code><a href="../../../javafx/beans/Observable.html#addListener-javafx.beans.InvalidationListener-">addListener</a>, <a href="../../../javafx/beans/Observable.html#removeListener-javafx.beans.InvalidationListener-">removeListener</a></code></li>
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<h4>addListener</h4>
<pre>void addListener(<a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value">ChangeListener</a><? super <a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a>> listener)</pre>
<div class="block">Adds a <a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value"><code>ChangeListener</code></a> which will be notified whenever the value
of the <code>ObservableValue</code> changes. 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>ChangeListener</code> instance may be safely
registered for different <code>ObservableValues</code>.
<p>
The <code>ObservableValue</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/value/ObservableValue.html#removeListener-javafx.beans.value.ChangeListener-"><code>removeListener</code></a> after use or to use an instance of
<a href="../../../javafx/beans/value/WeakChangeListener.html" title="class in javafx.beans.value"><code>WeakChangeListener</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/value/ObservableValue.html#removeListener-javafx.beans.value.ChangeListener-"><code>removeListener(ChangeListener)</code></a></dd>
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<h4>removeListener</h4>
<pre>void removeListener(<a href="../../../javafx/beans/value/ChangeListener.html" title="interface in javafx.beans.value">ChangeListener</a><? super <a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a>> listener)</pre>
<div class="block">Removes the given listener from the list of listeners, that are notified
whenever the value of the <code>ObservableValue</code> changes.
<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/value/ObservableValue.html#addListener-javafx.beans.value.ChangeListener-"><code>addListener(ChangeListener)</code></a></dd>
</dl>
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<h4>getValue</h4>
<pre><a href="../../../javafx/beans/value/ObservableValue.html" title="type parameter in ObservableValue">T</a> getValue()</pre>
<div class="block">Returns the current value of this <code>ObservableValue</code></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The current value</dd>
</dl>
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