com.hp.util

Class Nullable<T>

java.lang.Object

com.hp.util.Nullable<T>

Type Parameters:

T - type of the value

All Implemented Interfaces:

Distributable, Serializable

public final class Nullable<T>
extends Object
implements Distributable, Serializable

Represents a value type that can be assigned null.

This is actually not necessary in Java because all object type references can be assigned null, however this class may be useful when an object type cannot be null (For example, frameworks to send messages between JVMs may require messages to be non-null).

This class is Serializable, however to accomplish Serialization the generic argument should also be.

Author:

Fabiel Zuniga

See Also:

Serialized Form

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)
T	getValue() Gets the value.
int	hashCode()
static <T> Nullable<T>	nullValue() Factory method that creates a Nullable with null value.
String	toString()
static <T> Nullable<T>	valueOf(T value) Factory method that creates a Nullable with a non-null value.

Methods inherited from class java.lang.Object

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

Method Detail

nullValue

public static <T> Nullable<T> nullValue()

Factory method that creates a Nullable with null value.

Returns:

a Nullable with null value

valueOf

public static <T> Nullable<T> valueOf(T value)

Factory method that creates a Nullable with a non-null value.

Parameters:

value - value

Returns:

a Nullable with a non-null value

getValue

public T getValue()

Gets the value.

Returns:

the value

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object