# Interface ObservableNumberValue

All Superinterfaces:
  `Observable, ObservableValue<Number>`

All Known Subinterfaces:
  `NumberBinding, NumberExpression, ObservableDoubleValue, ObservableFloatValue, ObservableIntegerValue, ObservableLongValue`

All Known Implementing Classes:
  `DoubleBinding, DoubleExpression, DoubleProperty, DoublePropertyBase, FloatBinding, FloatExpression, FloatProperty, FloatPropertyBase, IntegerBinding, IntegerExpression, IntegerProperty, IntegerPropertyBase, JavaBeanDoubleProperty, JavaBeanFloatProperty, JavaBeanIntegerProperty, JavaBeanLongProperty, LongBinding, LongExpression, LongProperty, LongPropertyBase, NumberExpressionBase, ReadOnlyDoubleProperty, ReadOnlyDoublePropertyBase, ReadOnlyDoubleWrapper, ReadOnlyFloatProperty, ReadOnlyFloatPropertyBase, ReadOnlyFloatWrapper, ReadOnlyIntegerProperty, ReadOnlyIntegerPropertyBase, ReadOnlyIntegerWrapper, ReadOnlyJavaBeanDoubleProperty, ReadOnlyJavaBeanFloatProperty, ReadOnlyJavaBeanIntegerProperty, ReadOnlyJavaBeanLongProperty, ReadOnlyLongProperty, ReadOnlyLongPropertyBase, ReadOnlyLongWrapper, SimpleDoubleProperty, SimpleFloatProperty, SimpleIntegerProperty, SimpleLongProperty, SimpleStyleableDoubleProperty, SimpleStyleableFloatProperty, SimpleStyleableIntegerProperty, SimpleStyleableLongProperty, StyleableDoubleProperty, StyleableFloatProperty, StyleableIntegerProperty, StyleableLongProperty`

public interface ObservableNumberValue extends ObservableValue<Number>
A common interface of all sub-interfaces of `ObservableValue` that wrap a number.

Since:
  JavaFX 2.0
See Also:
  - `ObservableValue`
  - `ObservableDoubleValue`
  - `ObservableFloatValue`
  - `ObservableIntegerValue`
  - `ObservableLongValue`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `double`
  `doubleValue()`
  Returns the value of this `ObservableNumberValue` as a `double`.
  `float`
  `floatValue()`
  Returns the value of this `ObservableNumberValue` as a `float`.
  `int`
  `intValue()`
  Returns the value of this `ObservableNumberValue` as an `int` .
  `long`
  `longValue()`
  Returns the value of this `ObservableNumberValue` as a `long` .

  ### Methods declared in interface Observable

  `addListener, removeListener, subscribe`

  ### Methods declared in interface ObservableValue

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

- ## Method Details

  - ### intValue

    int intValue()
    Returns the value of this `ObservableNumberValue` as an `int` . If the value is not an `int`, a standard cast is performed.
    Returns:
      The value of this `ObservableNumberValue` as an `int`

  - ### longValue

    long longValue()
    Returns the value of this `ObservableNumberValue` as a `long` . If the value is not a `long`, a standard cast is performed.
    Returns:
      The value of this `ObservableNumberValue` as a `long`

  - ### floatValue

    float floatValue()
    Returns the value of this `ObservableNumberValue` as a `float`. If the value is not a `float`, a standard cast is performed.
    Returns:
      The value of this `ObservableNumberValue` as a `float`

  - ### doubleValue

    double doubleValue()
    Returns the value of this `ObservableNumberValue` as a `double`. If the value is not a `double`, a standard cast is performed.
    Returns:
      The value of this `ObservableNumberValue` as a `double`