Class BooleanExpression

java.lang.Object

javafx.beans.binding.BooleanExpression

All Implemented Interfaces:: Observable, ObservableBooleanValue, ObservableValue<Boolean>

Direct Known Subclasses:: BooleanBinding, ReadOnlyBooleanProperty

public abstract class BooleanExpression extends Object implements ObservableBooleanValue

BooleanExpression is an ObservableBooleanValue plus additional convenience methods to generate bindings in a fluent style.

A concrete sub-class of BooleanExpression has to implement the method ObservableBooleanValue.get(), which provides the actual value of this expression.

Since:: JavaFX 2.0

Constructor Summary

Constructor	Description
`BooleanExpression()`	Creates a default `BooleanExpression`.

Method Summary

Modifier and Type	Method	Description
`BooleanBinding`	`and(ObservableBooleanValue other)`	Creates a new `BooleanExpression` that performs the conditional AND-operation on this `BooleanExpression` and a `ObservableBooleanValue`.
`ObjectExpression<Boolean>`	`asObject()`	Creates an `ObjectExpression` that holds the value of this `BooleanExpression`.
`StringBinding`	`asString()`	Creates a `StringBinding` that holds the value of this `BooleanExpression` turned into a `String`.
`static BooleanExpression`	`booleanExpression(ObservableBooleanValue value)`	Returns a `BooleanExpression` that wraps a `ObservableBooleanValue`.
`static BooleanExpression`	`booleanExpression(ObservableValue<Boolean> value)`	Returns a `BooleanExpression` that wraps an `ObservableValue`.
`Boolean`	`getValue()`	Returns the current value of this `ObservableValue`
`BooleanBinding`	`isEqualTo(ObservableBooleanValue other)`	Creates a new `BooleanExpression` that holds `true` if this and another `ObservableBooleanValue` are equal.
`BooleanBinding`	`isNotEqualTo(ObservableBooleanValue other)`	Creates a new `BooleanExpression` that holds `true` if this and another `ObservableBooleanValue` are equal.
`BooleanBinding`	`not()`	Creates a new `BooleanExpression` that calculates the negation of this `BooleanExpression`.
`BooleanBinding`	`or(ObservableBooleanValue other)`	Creates a new `BooleanExpression` that performs the conditional OR-operation on this `BooleanExpression` and a `ObservableBooleanValue`.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods declared in interface javafx.beans.Observable

addListener, removeListener, subscribe

Methods declared in interface javafx.beans.value.ObservableBooleanValue

get

Methods declared in interface javafx.beans.value.ObservableValue

addListener, flatMap, map, orElse, removeListener, subscribe, subscribe, when

Constructor Details

BooleanExpression

public BooleanExpression()

Creates a default BooleanExpression.

Method Details

getValue

public Boolean getValue()

Description copied from interface: ObservableValue

Returns the current value of this ObservableValue

Specified by:: getValue in interface ObservableValue<Boolean>
Returns:: The current value

booleanExpression

public static BooleanExpression booleanExpression(ObservableBooleanValue value)

Returns a BooleanExpression that wraps a ObservableBooleanValue. If the ObservableBooleanValue is already a BooleanExpression, it will be returned. Otherwise a new BooleanBinding is created that is bound to the ObservableBooleanValue.

Parameters:: value - The source ObservableBooleanValue
Returns:: A BooleanExpression that wraps the ObservableBooleanValue if necessary
Throws:: NullPointerException - if value is null

booleanExpression

public static BooleanExpression booleanExpression(ObservableValue<Boolean> value)

Returns a BooleanExpression that wraps an ObservableValue. If the ObservableValue is already a BooleanExpression, it will be returned. Otherwise a new BooleanBinding is created that is bound to the ObservableValue. Note: null values will be interpreted as "false".

Parameters:: value - The source ObservableValue
Returns:: A BooleanExpression that wraps the ObservableValue if necessary
Throws:: NullPointerException - if value is null
Since:: JavaFX 8.0

and

public BooleanBinding and(ObservableBooleanValue other)

Creates a new BooleanExpression that performs the conditional AND-operation on this BooleanExpression and a ObservableBooleanValue.

Parameters:: other - the other ObservableBooleanValue
Returns:: the new BooleanExpression
Throws:: NullPointerException - if other is null

or

public BooleanBinding or(ObservableBooleanValue other)

Creates a new BooleanExpression that performs the conditional OR-operation on this BooleanExpression and a ObservableBooleanValue.

Parameters:: other - the other ObservableBooleanValue
Returns:: the new BooleanExpression
Throws:: NullPointerException - if other is null

not

public BooleanBinding not()

Creates a new BooleanExpression that calculates the negation of this BooleanExpression.

Returns:: the new BooleanExpression

isEqualTo

public BooleanBinding isEqualTo(ObservableBooleanValue other)

Creates a new BooleanExpression that holds true if this and another ObservableBooleanValue are equal.

Parameters:: other - the other ObservableBooleanValue
Returns:: the new BooleanExpression
Throws:: NullPointerException - if other is null

isNotEqualTo

public BooleanBinding isNotEqualTo(ObservableBooleanValue other)

Creates a new BooleanExpression that holds true if this and another ObservableBooleanValue are equal.

Parameters:: other - the other ObservableBooleanValue
Returns:: the new BooleanExpression
Throws:: NullPointerException - if other is null

asString

public StringBinding asString()

Creates a StringBinding that holds the value of this BooleanExpression turned into a String. If the value of this BooleanExpression changes, the value of the StringBinding will be updated automatically.

Returns:: the new StringBinding

asObject

public ObjectExpression<Boolean> asObject()

Creates an ObjectExpression that holds the value of this BooleanExpression. If the value of this BooleanExpression changes, the value of the ObjectExpression will be updated automatically.

Returns:: the new ObjectExpression
Since:: JavaFX 8.0

© 2008, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from JavaFX API Documentation.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Java, JavaFX and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.