edu.uci.ics.jung.utils

Class MutableInteger

java.lang.Object

java.lang.Number

edu.uci.ics.jung.utils.MutableInteger

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable

public class MutableInteger
extends java.lang.Number
implements java.lang.Comparable

The MutableInteger class wraps a value of the primitive type int in a mutable object. An object of type MutableInteger contains a single field whose type is int. This allows the system to not pile up large sets of temporary "numbers" and reduces object creation when doing math.

In addition, this class provides several methods for converting a int to a String and a String to a int.

Warning: It is important to not modify Mutable values when they are in a sorted data structure, such as a TreeSet! They will fall out of order and cause the set to be inconsistent

Author:

Scott White

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MutableInteger() Constructs a new MutableInteger with default value 0.
MutableInteger(int initialValue)

Method Summary

Methods

Modifier and Type	Method and Description
MutableInteger	add(double value) Increases the int's value by value.
int	compareTo(java.lang.Object o)
void	decrement() Subtracts one from the contained integer value.
double	doubleValue() Returns the integer value of this object, expressed as a double.
boolean	equals(java.lang.Object obj) Compares this object to the specified object.
float	floatValue() Returns the integer value of this object, expressed as a float.
int	hashCode() Returns a hashcode for this Integer.
MutableInteger	increment() Adds one to the contained integer value.
int	intValue() Returns the integer value of this object.
long	longValue() Returns the integer value of this object, expressed as a long.
void	setInteger(int newInteger) Sets the value of this object to newInteger.
MutableInteger	subtract(double value) Increases the int's value by value.
java.lang.String	toString()

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

MutableInteger

public MutableInteger()

Constructs a new MutableInteger with default value 0.

MutableInteger

public MutableInteger(int initialValue)

Method Detail

intValue

public int intValue()

Returns the integer value of this object.

Specified by:

intValue in class java.lang.Number

longValue

public long longValue()

Returns the integer value of this object, expressed as a long.

Specified by:

longValue in class java.lang.Number

floatValue

public float floatValue()

Returns the integer value of this object, expressed as a float.

Specified by:

floatValue in class java.lang.Number

doubleValue

public double doubleValue()

Returns the integer value of this object, expressed as a double.

Specified by:

doubleValue in class java.lang.Number

add

public MutableInteger add(double value)

Increases the int's value by value. The object will, after this call, contain the value (int) ( intValue() + value ) .

Parameters:

value - the amount to add

Returns:

this object, for convenience in chaining operations

subtract

public MutableInteger subtract(double value)

Increases the int's value by value. The object will, after this call, contain the value (int) ( intValue() - value ) .

Parameters:

value - the amount to subtract

Returns:

this object, for convenience in chaining operations

compareTo

public int compareTo(java.lang.Object o)

Specified by:

compareTo in interface java.lang.Comparable

See Also:

Comparable

equals

public boolean equals(java.lang.Object obj)

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

Overrides:

equals in class java.lang.Object

Parameters:

obj - the object to compare with.

Returns:

true if the objects are the same; false otherwise.

hashCode

public int hashCode()

Returns a hashcode for this Integer.

Overrides:

hashCode in class java.lang.Object

Returns:

a hash code value for this object, equal to the primitive int value represented by this MutableInteger object.

setInteger

public void setInteger(int newInteger)

Sets the value of this object to newInteger.

increment

public MutableInteger increment()

Adds one to the contained integer value.

Returns:

this, to assist in chaining.

decrement

public void decrement()

Subtracts one from the contained integer value.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object