# Class FloatExpression

java.lang.Object
javafx.beans.binding.NumberExpressionBase
javafx.beans.binding.FloatExpression

All Implemented Interfaces:
  `NumberExpression, Observable, ObservableFloatValue, ObservableNumberValue, ObservableValue<Number>`

Direct Known Subclasses:
  `FloatBinding, ReadOnlyFloatProperty`

public abstract class FloatExpression extends NumberExpressionBase implements ObservableFloatValue
`FloatExpression` is an `ObservableFloatValue` plus additional convenience methods to generate bindings in a fluent style.

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

Since:
  JavaFX 2.0

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `FloatExpression()`
  Creates a default `FloatExpression`.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `DoubleBinding`
  `add(double other)`
  Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
  `FloatBinding`
  `add(float other)`
  Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
  `FloatBinding`
  `add(int other)`
  Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
  `FloatBinding`
  `add(long other)`
  Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
  `ObjectExpression<Float>`
  `asObject()`
  Creates an `ObjectExpression` that holds the value of this `FloatExpression`.
  `DoubleBinding`
  `divide(double other)`
  Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
  `FloatBinding`
  `divide(float other)`
  Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
  `FloatBinding`
  `divide(int other)`
  Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
  `FloatBinding`
  `divide(long other)`
  Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
  `double`
  `doubleValue()`
  Returns the value of this `ObservableNumberValue` as a `double`.
  `static FloatExpression`
  `floatExpression(ObservableFloatValue value)`
  Returns a `FloatExpression` that wraps a `ObservableFloatValue`.
  `static <T extends Number>
  FloatExpression`
  `floatExpression(ObservableValue<T> value)`
  Returns a `FloatExpression` that wraps an `ObservableValue`.
  `float`
  `floatValue()`
  Returns the value of this `ObservableNumberValue` as a `float`.
  `Float`
  `getValue()`
  Returns the current value of this `ObservableValue`
  `int`
  `intValue()`
  Returns the value of this `ObservableNumberValue` as an `int` .
  `long`
  `longValue()`
  Returns the value of this `ObservableNumberValue` as a `long` .
  `DoubleBinding`
  `multiply(double other)`
  Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
  `FloatBinding`
  `multiply(float other)`
  Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
  `FloatBinding`
  `multiply(int other)`
  Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
  `FloatBinding`
  `multiply(long other)`
  Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
  `FloatBinding`
  `negate()`
  Creates a new `NumberBinding` that calculates the negation of `NumberExpression`.
  `DoubleBinding`
  `subtract(double other)`
  Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
  `FloatBinding`
  `subtract(float other)`
  Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
  `FloatBinding`
  `subtract(int other)`
  Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
  `FloatBinding`
  `subtract(long other)`
  Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.

  ### Methods declared in class NumberExpressionBase

  `add, asString, asString, asString, divide, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, lessThan, lessThan, lessThan, lessThan, lessThan, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, multiply, numberExpression, subtract`

  ### Methods declared in class Object

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

  ### Methods declared in interface Observable

  `addListener, removeListener, subscribe`

  ### Methods declared in interface ObservableFloatValue

  `get`

  ### Methods declared in interface ObservableValue

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

- ## Constructor Details

  - ### FloatExpression

    public FloatExpression()
    Creates a default `FloatExpression`.

- ## Method Details

  - ### intValue

    public int intValue()
    Description copied from interface: `ObservableNumberValue`
    Returns the value of this `ObservableNumberValue` as an `int` . If the value is not an `int`, a standard cast is performed.
    Specified by:
      `intValue` in interface `ObservableNumberValue`
    Returns:
      The value of this `ObservableNumberValue` as an `int`

  - ### longValue

    public long longValue()
    Description copied from interface: `ObservableNumberValue`
    Returns the value of this `ObservableNumberValue` as a `long` . If the value is not a `long`, a standard cast is performed.
    Specified by:
      `longValue` in interface `ObservableNumberValue`
    Returns:
      The value of this `ObservableNumberValue` as a `long`

  - ### floatValue

    public float floatValue()
    Description copied from interface: `ObservableNumberValue`
    Returns the value of this `ObservableNumberValue` as a `float`. If the value is not a `float`, a standard cast is performed.
    Specified by:
      `floatValue` in interface `ObservableNumberValue`
    Returns:
      The value of this `ObservableNumberValue` as a `float`

  - ### doubleValue

    public double doubleValue()
    Description copied from interface: `ObservableNumberValue`
    Returns the value of this `ObservableNumberValue` as a `double`. If the value is not a `double`, a standard cast is performed.
    Specified by:
      `doubleValue` in interface `ObservableNumberValue`
    Returns:
      The value of this `ObservableNumberValue` as a `double`

  - ### getValue

    public Float getValue()
    Description copied from interface: `ObservableValue`
    Returns the current value of this `ObservableValue`
    Specified by:
      `getValue` in interface `ObservableValue<Number>`
    Returns:
      The current value

  - ### floatExpression

    public static FloatExpression floatExpression(ObservableFloatValue value)
    Returns a `FloatExpression` that wraps a `ObservableFloatValue`. If the `ObservableFloatValue` is already a `FloatExpression`, it will be returned. Otherwise a new `FloatBinding` is created that is bound to the `ObservableFloatValue`.
    Parameters:
      `value` - The source `ObservableFloatValue`
    Returns:
      A `FloatExpression` that wraps the `ObservableFloatValue` if necessary
    Throws:
      `NullPointerException` - if `value` is `null`

  - ### floatExpression

    public static <T extends Number> FloatExpression floatExpression(ObservableValue<T> value)
    Returns a `FloatExpression` that wraps an `ObservableValue`. If the `ObservableValue` is already a `FloatExpression`, it will be returned. Otherwise a new `FloatBinding` is created that is bound to the `ObservableValue`.

    Note: this method can be used to convert an `ObjectExpression` or `ObjectProperty` of specific number type to FloatExpression, which is essentially an `ObservableValue<Number>`. See sample below.

    >       FloatProperty floatProperty = new SimpleFloatProperty(1.0f);
    >       ObjectProperty<Float> objectProperty = new SimpleObjectProperty<>(2.0f);
    >       BooleanBinding binding = floatProperty.greaterThan(FloatExpression.floatExpression(objectProperty));

    Note: null values will be interpreted as 0f
    Type Parameters:
      `T` - The type of Number to be wrapped
    Parameters:
      `value` - The source `ObservableValue`
    Returns:
      A `FloatExpression` that wraps the `ObservableValue` if necessary
    Throws:
      `NullPointerException` - if `value` is `null`
    Since:
      JavaFX 8.0

  - ### negate

    public FloatBinding negate()
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the negation of `NumberExpression`.
    Specified by:
      `negate` in interface `NumberExpression`
    Returns:
      the new `NumberBinding`

  - ### add

    public DoubleBinding add(double other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
    Specified by:
      `add` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### add

    public FloatBinding add(float other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
    Specified by:
      `add` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### add

    public FloatBinding add(long other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
    Specified by:
      `add` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### add

    public FloatBinding add(int other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the sum of this `NumberExpression` and a constant value.
    Specified by:
      `add` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### subtract

    public DoubleBinding subtract(double other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
    Specified by:
      `subtract` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### subtract

    public FloatBinding subtract(float other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
    Specified by:
      `subtract` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### subtract

    public FloatBinding subtract(long other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
    Specified by:
      `subtract` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### subtract

    public FloatBinding subtract(int other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the difference of this `NumberExpression` and a constant value.
    Specified by:
      `subtract` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### multiply

    public DoubleBinding multiply(double other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
    Specified by:
      `multiply` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### multiply

    public FloatBinding multiply(float other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
    Specified by:
      `multiply` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### multiply

    public FloatBinding multiply(long other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
    Specified by:
      `multiply` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### multiply

    public FloatBinding multiply(int other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the product of this `NumberExpression` and a constant value.
    Specified by:
      `multiply` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### divide

    public DoubleBinding divide(double other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
    Specified by:
      `divide` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### divide

    public FloatBinding divide(float other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
    Specified by:
      `divide` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### divide

    public FloatBinding divide(long other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
    Specified by:
      `divide` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### divide

    public FloatBinding divide(int other)
    Description copied from interface: `NumberExpression`
    Creates a new `NumberBinding` that calculates the division of this `NumberExpression` and a constant value.
    Specified by:
      `divide` in interface `NumberExpression`
    Parameters:
      `other` - the constant value
    Returns:
      the new `NumberBinding`

  - ### asObject

    public ObjectExpression<Float> asObject()
    Creates an `ObjectExpression` that holds the value of this `FloatExpression`. If the value of this `FloatExpression` changes, the value of the `ObjectExpression` will be updated automatically.
    Returns:
      the new `ObjectExpression`
    Since:
      JavaFX 8.0