org.apache.commons.lang.mutable
Class MutableDouble

java.lang.Object
  extended byjava.lang.Number
      extended byorg.apache.commons.lang.mutable.MutableDouble
All Implemented Interfaces:
java.lang.Comparable, Mutable, java.io.Serializable

public class MutableDouble
extends java.lang.Number
implements java.lang.Comparable, Mutable

A mutable double wrapper.

Since:
2.1
Version:
$Id: MutableDouble.java 618693 2008-02-05 16:33:29Z sebb $
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(java.lang.Number value)
          Constructs a new MutableDouble with the specified value.
 
Method Summary
 void add(double operand)
          Adds a value.
 void add(java.lang.Number operand)
          Adds a value.
 int compareTo(java.lang.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(java.lang.Object obj)
          Compares this object against the specified object.
 float floatValue()
          Returns the value of this MutableDouble as a float.
 java.lang.Object getValue()
          Gets the value as a Double instance.
 int hashCode()
          Returns a suitable hashcode for this mutable.
 void increment()
          Increments the value.
 int intValue()
          Returns the value of this MutableDouble as a 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(java.lang.Object value)
          Sets the value from any Number instance.
 void subtract(double operand)
          Subtracts a value.
 void subtract(java.lang.Number operand)
          Subtracts a value.
 java.lang.Double toDouble()
          Gets this mutable as an instance of Double.
 java.lang.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 - a value.

MutableDouble

public MutableDouble(java.lang.Number value)
Constructs a new MutableDouble with the specified value.

Parameters:
value - a value.
Throws:
java.lang.NullPointerException - if the object is null
Method Detail

getValue

public java.lang.Object getValue()
Gets the value as a Double instance.

Specified by:
getValue in interface Mutable
Returns:
the value as a Double

setValue

public void setValue(double value)
Sets the value.

Parameters:
value - the value to set

setValue

public void setValue(java.lang.Object value)
Sets the value from any Number instance.

Specified by:
setValue in interface Mutable
Parameters:
value - the value to set
Throws:
java.lang.NullPointerException - if the object is null
java.lang.ClassCastException - if the type is not a Number

intValue

public int intValue()
Returns the value of this MutableDouble as a int.

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.

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.

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.

Returns:
the numeric value represented by this object after conversion to type double.

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

toDouble

public java.lang.Double toDouble()
Gets this mutable as an instance of Double.

Returns:
a Double instance containing the value from this mutable

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.

Parameters:
operand - the value to add
Since:
Commons Lang 2.2

add

public void add(java.lang.Number operand)
Adds a value.

Parameters:
operand - the value to add
Throws:
java.lang.NullPointerException - if the object is null
Since:
Commons Lang 2.2

subtract

public void subtract(double operand)
Subtracts a value.

Parameters:
operand - the value to add
Since:
Commons Lang 2.2

subtract

public void subtract(java.lang.Number operand)
Subtracts a value.

Parameters:
operand - the value to add
Throws:
java.lang.NullPointerException - if the object is null
Since:
Commons Lang 2.2

equals

public boolean equals(java.lang.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:

Parameters:
obj - the object to compare with.
Returns:
true if the objects are the same; false otherwise.

hashCode

public int hashCode()
Returns a suitable hashcode for this mutable.

Returns:
a suitable hashcode

compareTo

public int compareTo(java.lang.Object obj)
Compares this mutable to another in ascending order.

Specified by:
compareTo in interface java.lang.Comparable
Parameters:
obj - the mutable to compare to
Returns:
negative if this is less, zero if equal, positive if greater
Throws:
java.lang.ClassCastException - if the argument is not a MutableDouble

toString

public java.lang.String toString()
Returns the String value of this mutable.

Returns:
the mutable value as a string


Copyright 2001-2008 The Apache Software Foundation. All Rights Reserved.