Package org.apache.commons.lang.mutable

Class MutableDouble

java.lang.Object
java.lang.Number
org.apache.commons.lang.mutable.MutableDouble
All Implemented Interfaces:
Serializable, Comparable, Mutable
public class MutableDouble extends Number implements Comparable, Mutable
A mutable double wrapper.
Since:
2.1
Version:
$Id: MutableDouble.java 905707 2010-02-02 16:59:59Z niallp $
See Also:

  • Constructor Summary

    Constructors
    Constructor
    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

    Modifier and Type
    Method
    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(Object obj)
    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.
    Object
    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(Object 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 Details

    • 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 Details

    • getValue

      public Object getValue()
      Gets the value as a Double instance.
      Specified by:
      getValue in interface Mutable
      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(Object value)
      Sets the value from any Number instance.
      Specified by:
      setValue in interface Mutable
      Parameters:
      value - the value to set, not null
      Throws:
      NullPointerException - if the object is null
      ClassCastException - if the type is not a Number

    • 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(Object obj)
      Compares this mutable to another in ascending order.
      Specified by:
      compareTo in interface Comparable
      Parameters:
      obj - the other mutable to compare to, not null
      Returns:
      negative if this is less, zero if equal, positive if greater
      Throws:
      ClassCastException - if the argument is not a MutableDouble

    • toString

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