org.apache.commons.lang.mutable
Class MutableFloat

java.lang.Object
  java.lang.Number
      org.apache.commons.lang.mutable.MutableFloat

All Implemented Interfaces:

Serializable, Comparable, Mutable

public class MutableFloat
extends Number
implements Comparable, Mutable

A mutable float wrapper.

Since:

2.1

Version:

$Id: MutableFloat.java 905707 2010-02-02 16:59:59Z niallp $

Author:

Apache Software Foundation

See Also:

Float, Serialized Form

Constructor Summary

MutableFloat()
Constructs a new MutableFloat with the default value of zero.

MutableFloat(float value)
Constructs a new MutableFloat with the specified value.

MutableFloat(Number value)
Constructs a new MutableFloat with the specified value.

MutableFloat(String value)
Constructs a new MutableFloat parsing the given string.

Method Summary

void	add(float 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 MutableFloat as a double.
boolean	equals(Object obj) Compares this object against some other object.
float	floatValue() Returns the value of this MutableFloat as a float.
Object	getValue() Gets the value as a Float instance.
int	hashCode() Returns a suitable hash code for this mutable.
void	increment() Increments the value.
int	intValue() Returns the value of this MutableFloat as an int.
boolean	isInfinite() Checks whether the float value is infinite.
boolean	isNaN() Checks whether the float value is the special NaN value.
long	longValue() Returns the value of this MutableFloat as a long.
void	setValue(float value) Sets the value.
void	setValue(Object value) Sets the value from any Number instance.
void	subtract(float operand) Subtracts a value from the value of this instance.
void	subtract(Number operand) Subtracts a value from the value of this instance.
Float	toFloat() Gets this mutable as an instance of Float.
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

MutableFloat

public MutableFloat()

Constructs a new MutableFloat with the default value of zero.

MutableFloat

public MutableFloat(float value)

Constructs a new MutableFloat with the specified value.

Parameters:

value - the initial value to store

MutableFloat

public MutableFloat(Number value)

Constructs a new MutableFloat with the specified value.

Parameters:

value - the initial value to store, not null

Throws:

NullPointerException - if the object is null

MutableFloat

public MutableFloat(String value)
             throws NumberFormatException

Constructs a new MutableFloat parsing the given string.

Parameters:

value - the string to parse, not null

Throws:

NumberFormatException - if the string cannot be parsed into a float

Since:

2.5

Method Detail

getValue

public Object getValue()

Gets the value as a Float instance.

Specified by:

getValue in interface Mutable

Returns:

the value as a Float, never null

setValue

public void setValue(float 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 float value is the special NaN value.

Returns:

true if NaN

isInfinite

public boolean isInfinite()

Checks whether the float 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(float operand)

Adds a value to the value of this instance.

Parameters:

operand - the value to add, not null

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(float operand)

Subtracts a value from the value of this instance.

Parameters:

operand - the value to subtract

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 MutableFloat 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 MutableFloat 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 MutableFloat 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 MutableFloat as a double.

Specified by:

doubleValue in class Number

Returns:

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

toFloat

public Float toFloat()

Gets this mutable as an instance of Float.

Returns:

a Float instance containing the value from this mutable, never null

equals

public boolean equals(Object obj)

Compares this object against some other object. The result is true if and only if the argument is not null and is a Float object that represents a float that has the identical bit pattern to the bit pattern of the float represented by this object. For this purpose, two float values are considered to be the same if and only if the method Float.floatToIntBits(float)returns the same int value when applied to each.

Note that in most cases, for two instances of class Float,f1 and f2, the value of f1.equals(f2) is true if and only if

   f1.floatValue() == f2.floatValue()
 

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

• If f1 and f2 both represent Float.NaN, then the equals method returns true, even though Float.NaN==Float.NaN has the value false.
• If f1 represents +0.0f while f2 represents -0.0f, or vice versa, the equal test has the value false, even though 0.0f==-0.0f has the value true.

This definition 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.

See Also:

Float.floatToIntBits(float)

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

toString

public String toString()

Returns the String value of this mutable.

Overrides:

toString in class Object

Returns:

the mutable value as a string