org.apache.commons.lang.mutable
Class MutableInt

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

All Implemented Interfaces:

Serializable, Comparable, Mutable

public class MutableInt
extends Number
implements Comparable, Mutable

A mutable int wrapper.

Since:

2.1

Version:

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

Author:

Apache Software Foundation

See Also:

Integer, Serialized Form

Constructor Summary

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

MutableInt(int value)
Constructs a new MutableInt with the specified value.

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

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

Method Summary

void	add(int 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 MutableInt as a double.
boolean	equals(Object obj) Compares this object to the specified object.
float	floatValue() Returns the value of this MutableInt as a float.
Object	getValue() Gets the value as a Integer instance.
int	hashCode() Returns a suitable hash code for this mutable.
void	increment() Increments the value.
int	intValue() Returns the value of this MutableInt as an int.
long	longValue() Returns the value of this MutableInt as a long.
void	setValue(int value) Sets the value.
void	setValue(Object value) Sets the value from any Number instance.
void	subtract(int operand) Subtracts a value from the value of this instance.
void	subtract(Number operand) Subtracts a value from the value of this instance.
Integer	toInteger() Gets this mutable as an instance of Integer.
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

MutableInt

public MutableInt()

Constructs a new MutableInt with the default value of zero.

MutableInt

public MutableInt(int value)

Constructs a new MutableInt with the specified value.

Parameters:

value - the initial value to store

MutableInt

public MutableInt(Number value)

Constructs a new MutableInt with the specified value.

Parameters:

value - the initial value to store, not null

Throws:

NullPointerException - if the object is null

MutableInt

public MutableInt(String value)
           throws NumberFormatException

Constructs a new MutableInt parsing the given string.

Parameters:

value - the string to parse, not null

Throws:

NumberFormatException - if the string cannot be parsed into an int

Since:

2.5

Method Detail

getValue

public Object getValue()

Gets the value as a Integer instance.

Specified by:

getValue in interface Mutable

Returns:

the value as a Integer, never null

setValue

public void setValue(int 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

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(int 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(int 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 MutableInt 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 MutableInt 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 MutableInt 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 MutableInt as a double.

Specified by:

doubleValue in class Number

Returns:

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

toInteger

public Integer toInteger()

Gets this mutable as an instance of Integer.

Returns:

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

equals

public boolean equals(Object obj)

Compares this object to the specified object. The result is true if and only if the argument is not null and is a MutableInt object that contains the same int value as this object.

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 MutableInt

toString

public String toString()

Returns the String value of this mutable.

Overrides:

toString in class Object

Returns:

the mutable value as a string