Generic interface that defines the methods common to all readable properties independent of their type.
extends ObservableValue<T>
Parameters:
<T>
Since: JavaFX 2.0
javafx.beans.property.ReadOnlyBooleanProperty.readOnlyBooleanProperty()
javafx.beans.property.ReadOnlyDoubleProperty.readOnlyDoubleProperty()
javafx.beans.property.ReadOnlyFloatProperty.readOnlyFloatProperty()
javafx.beans.property.ReadOnlyIntegerProperty.readOnlyIntegerProperty()
javafx.beans.property.ReadOnlyLongProperty.readOnlyLongProperty()