org.jgrapht.util

Class ModifiableInteger

java.lang.Object

java.lang.Number

org.jgrapht.util.ModifiableInteger

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable

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

The ModifiableInteger class wraps a value of the primitive type int in an object, similarly to Integer. An object of type ModifiableInteger contains a single field whose type is int.

Unlike java.lang.Integer, the int value which the ModifiableInteger represents can be modified. It becomes useful when used together with the collection framework. For example, if you want to have a List of counters. You could use Integer but that would have became wasteful and inefficient if you frequently had to update the counters.

WARNING: Because instances of this class are mutable, great care must be exercised if used as keys of a Map or as values in a Set in a manner that affects equals comparisons while the instances are keys in the map (or values in the set). For more see documentation of Map and Set.

Since:

May 27, 2004

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	value The int value represented by this ModifiableInteger.

Constructor Summary

Constructors

Constructor and Description
ModifiableInteger() Deprecated. not really deprecated, just marked so to avoid mistaken use.
ModifiableInteger(int value) Constructs a newly allocated ModifiableInteger object that represents the specified int value.

Method Summary

Modifier and Type	Method and Description
int	compareTo(ModifiableInteger anotherInteger) Compares two ModifiableInteger objects numerically.
int	compareTo(java.lang.Object o) Compares this ModifiableInteger object to another object.
void	decrement() Subtracts one from the value of this modifiable integer.
double	doubleValue()
boolean	equals(java.lang.Object o) Compares this object to the specified object.
float	floatValue()
int	getValue() Returns the value of this object, similarly to intValue().
int	hashCode() Returns a hash code for this ModifiableInteger.
void	increment() Adds one to the value of this modifiable integer.
int	intValue()
long	longValue()
void	setValue(int value) Sets a new value for this modifiable integer.
java.lang.Integer	toInteger() Returns an Integer object representing this ModifiableInteger's value.
java.lang.String	toString() Returns a String object representing this ModifiableInteger's value.

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

value

public int value

The int value represented by this ModifiableInteger.

Constructor Detail

ModifiableInteger

@Deprecated
public ModifiableInteger()

Deprecated. not really deprecated, just marked so to avoid mistaken use.

!!! DON'T USE - Use the ModifiableInteger(int) constructor instead !!!

This constructor is for the use of java.beans.XMLDecoder deserialization. The constructor is marked as 'deprecated' to indicate to the programmer against using it by mistake.

ModifiableInteger

public ModifiableInteger(int value)

Constructs a newly allocated ModifiableInteger object that represents the specified int value.

Parameters:

value - the value to be represented by the ModifiableInteger object.

Method Detail

setValue

public void setValue(int value)

Sets a new value for this modifiable integer.

Parameters:

value - the new value to set.

getValue

public int getValue()

Returns the value of this object, similarly to intValue(). This getter is NOT redundant. It is used for serialization by java.beans.XMLEncoder.

Returns:

the value.

increment

public void increment()

Adds one to the value of this modifiable integer.

decrement

public void decrement()

Subtracts one from the value of this modifiable integer.

compareTo

public int compareTo(ModifiableInteger anotherInteger)

Compares two ModifiableInteger objects numerically.

Parameters:

anotherInteger - the ModifiableInteger to be compared.

Returns:

the value 0 if this ModifiableInteger is equal to the argument ModifiableInteger; a value less than 0 if this ModifiableInteger is numerically less than the argument ModifiableInteger; and a value greater than 0 if this ModifiableInteger is numerically greater than the argument ModifiableInteger (signed comparison).

compareTo

public int compareTo(java.lang.Object o)

Compares this ModifiableInteger object to another object. If the object is an ModifiableInteger, this function behaves like compareTo(Integer). Otherwise, it throws a ClassCastException (as ModifiableInteger objects are only comparable to other ModifiableInteger objects).

Specified by:

compareTo in interface java.lang.Comparable

Parameters:

o - the Object to be compared.

Returns:

the value 0 if the argument is a ModifiableInteger numerically equal to this ModifiableInteger; a value less than 0 if the argument is a ModifiableInteger numerically greater than this ModifiableInteger; and a value greater than 0 if the argument is a ModifiableInteger numerically less than this ModifiableInteger.

See Also:

Comparable.compareTo(java.lang.Object)

doubleValue

public double doubleValue()

Specified by:

doubleValue in class java.lang.Number

See Also:

Number.doubleValue()

equals

public boolean equals(java.lang.Object o)

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

Overrides:

equals in class java.lang.Object

Parameters:

o - the object to compare with.

Returns:

true if the objects are the same; false otherwise.

floatValue

public float floatValue()

Specified by:

floatValue in class java.lang.Number

See Also:

Number.floatValue()

hashCode

public int hashCode()

Returns a hash code for this ModifiableInteger.

Overrides:

hashCode in class java.lang.Object

Returns:

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

intValue

public int intValue()

Specified by:

intValue in class java.lang.Number

See Also:

Number.intValue()

longValue

public long longValue()

Specified by:

longValue in class java.lang.Number

See Also:

Number.longValue()

toInteger

public java.lang.Integer toInteger()

Returns an Integer object representing this ModifiableInteger's value.

Returns:

an Integer representation of the value of this object.

toString

public java.lang.String toString()

Returns a String object representing this ModifiableInteger's value. The value is converted to signed decimal representation and returned as a string, exactly as if the integer value were given as an argument to the Integer.toString(int) method.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the value of this object in base 10.