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 $

Author:

Apache Software Foundation

See Also:

Double, Serialized Form

Constructor Summary

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

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 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 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