org.apache.commons.lang3.mutable

## Class MutableDouble

- java.lang.Object
- - java.lang.Number
  - - org.apache.commons.lang3.mutable.MutableDouble

- All Implemented Interfaces:
    Serializable, Comparable<MutableDouble>, Mutable<Number>

      public class MutableDouble
      extends Number
      implements Comparable<MutableDouble>, Mutable<Number>

  A mutable `double` wrapper.

  Note that as MutableDouble does not extend Double, it is not treated by String.format as a Double parameter.

  Since:
    2.1
  Version:
    $Id: MutableDouble.java 1436770 2013-01-22 07:09:45Z ggregory $
  See Also:
    `Double`, Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `MutableDouble()` Constructs a new MutableDouble with the default value of zero.
    `MutableDouble(double value)` Constructs a new MutableDouble with the specified value.
    `MutableDouble(Number value)` Constructs a new MutableDouble with the specified value.
    `MutableDouble(String value)` Constructs a new MutableDouble parsing the given string.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(double operand)` Adds a value to the value of this instance.
    `void` | `add(Number operand)` Adds a value to the value of this instance.
    `int` | `compareTo(MutableDouble other)` Compares this mutable to another in ascending order.
    `void` | `decrement()` Decrements the value.
    `double` | `doubleValue()` Returns the value of this MutableDouble as a double.
    `boolean` | `equals(Object obj)` Compares this object against the specified object.
    `float` | `floatValue()` Returns the value of this MutableDouble as a float.
    `Double` | `getValue()` Gets the value as a Double instance.
    `int` | `hashCode()` Returns a suitable hash code for this mutable.
    `void` | `increment()` Increments the value.
    `int` | `intValue()` Returns the value of this MutableDouble as an int.
    `boolean` | `isInfinite()` Checks whether the double value is infinite.
    `boolean` | `isNaN()` Checks whether the double value is the special NaN value.
    `long` | `longValue()` Returns the value of this MutableDouble as a long.
    `void` | `setValue(double value)` Sets the value.
    `void` | `setValue(Number value)` Sets the value from any Number instance.
    `void` | `subtract(double operand)` Subtracts a value from the value of this instance.
    `void` | `subtract(Number operand)` Subtracts a value from the value of this instance.
    `Double` | `toDouble()` Gets this mutable as an instance of Double.
    `String` | `toString()` Returns the String value of this mutable.

    - ### Methods inherited from class java.lang.Number

      `byteValue, shortValue`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### MutableDouble

          public MutableDouble()

      Constructs a new MutableDouble with the default value of zero.

    - #### MutableDouble

          public MutableDouble(double value)

      Constructs a new MutableDouble with the specified value.
      Parameters:
        `value` - the initial value to store

    - #### MutableDouble

          public MutableDouble(Number value)

      Constructs a new MutableDouble with the specified value.
      Parameters:
        `value` - the initial value to store, not null
      Throws:
        `NullPointerException` - if the object is null

    - #### MutableDouble

          public MutableDouble(String value)
                        throws NumberFormatException

      Constructs a new MutableDouble parsing the given string.
      Parameters:
        `value` - the string to parse, not null
      Throws:
        `NumberFormatException` - if the string cannot be parsed into a double
      Since:
        2.5

  - ### Method Detail

    - #### getValue

          public Double getValue()

      Gets the value as a Double instance.
      Specified by:
        `getValue` in interface `Mutable<Number>`
      Returns:
        the value as a Double, never null

    - #### setValue

          public void setValue(double value)

      Sets the value.
      Parameters:
        `value` - the value to set

    - #### setValue

          public void setValue(Number value)

      Sets the value from any Number instance.
      Specified by:
        `setValue` in interface `Mutable<Number>`
      Parameters:
        `value` - the value to set, not null
      Throws:
        `NullPointerException` - if the object is null

    - #### isNaN

          public boolean isNaN()

      Checks whether the double value is the special NaN value.
      Returns:
        true if NaN

    - #### isInfinite

          public boolean isInfinite()

      Checks whether the double value is infinite.
      Returns:
        true if infinite

    - #### increment

          public void increment()

      Increments the value.
      Since:
        Commons Lang 2.2

    - #### decrement

          public void decrement()

      Decrements the value.
      Since:
        Commons Lang 2.2

    - #### add

          public void add(double operand)

      Adds a value to the value of this instance.
      Parameters:
        `operand` - the value to add
      Since:
        Commons Lang 2.2

    - #### add

          public void add(Number operand)

      Adds a value to the value of this instance.
      Parameters:
        `operand` - the value to add, not null
      Throws:
        `NullPointerException` - if the object is null
      Since:
        Commons Lang 2.2

    - #### subtract

          public void subtract(double operand)

      Subtracts a value from the value of this instance.
      Parameters:
        `operand` - the value to subtract, not null
      Since:
        Commons Lang 2.2

    - #### subtract

          public void subtract(Number operand)

      Subtracts a value from the value of this instance.
      Parameters:
        `operand` - the value to subtract, not null
      Throws:
        `NullPointerException` - if the object is null
      Since:
        Commons Lang 2.2

    - #### intValue

          public int intValue()

      Returns the value of this MutableDouble as an int.
      Specified by:
        `intValue` in class `Number`
      Returns:
        the numeric value represented by this object after conversion to type int.

    - #### longValue

          public long longValue()

      Returns the value of this MutableDouble as a long.
      Specified by:
        `longValue` in class `Number`
      Returns:
        the numeric value represented by this object after conversion to type long.

    - #### floatValue

          public float floatValue()

      Returns the value of this MutableDouble as a float.
      Specified by:
        `floatValue` in class `Number`
      Returns:
        the numeric value represented by this object after conversion to type float.

    - #### doubleValue

          public double doubleValue()

      Returns the value of this MutableDouble as a double.
      Specified by:
        `doubleValue` in class `Number`
      Returns:
        the numeric value represented by this object after conversion to type double.

    - #### toDouble

          public Double toDouble()

      Gets this mutable as an instance of Double.
      Returns:
        a Double instance containing the value from this mutable, never null

    - #### equals

          public boolean equals(Object obj)

      Compares this object against the specified object. The result is `true` if and only if the argument is not `null` and is a `Double` object that represents a double that has the identical bit pattern to the bit pattern of the double represented by this object. For this purpose, two `double` values are considered to be the same if and only if the method `Double.doubleToLongBits(double)`returns the same long value when applied to each.

      Note that in most cases, for two instances of class `Double`,`d1` and `d2`, the value of `d1.equals(d2)` is `true` if and only if

      >        d1.doubleValue() == d2.doubleValue()

      also has the value `true`. However, there are two exceptions:

      - If `d1` and `d2` both represent `Double.NaN`, then the `equals` method returns `true`, even though `Double.NaN==Double.NaN` has the value `false`.
      - If `d1` represents `+0.0` while `d2` represents `-0.0`, or vice versa, the `equal` test has the value `false`, even though `+0.0==-0.0` has the value `true`. This allows hashtables to operate properly.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `obj` - the object to compare with, null returns false
      Returns:
        `true` if the objects are the same; `false` otherwise.

    - #### hashCode

          public int hashCode()

      Returns a suitable hash code for this mutable.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a suitable hash code

    - #### compareTo

          public int compareTo(MutableDouble other)

      Compares this mutable to another in ascending order.
      Specified by:
        `compareTo` in interface `Comparable<MutableDouble>`
      Parameters:
        `other` - the other mutable to compare to, not null
      Returns:
        negative if this is less, zero if equal, positive if greater

    - #### toString

          public String toString()

      Returns the String value of this mutable.
      Overrides:
        `toString` in class `Object`
      Returns:
        the mutable value as a string

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