org.apache.commons.lang.mutable
Class MutableFloat

java.lang.Object
  extended by java.lang.Number
      extended by 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:

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


Copyright © 2001-2011 The Apache Software Foundation. All Rights Reserved.