jbil.common
Class Pair<E,F>

java.lang.Object
  jbil.common.Pair<E,F>

Type Parameters:

E - The type of the first element.

F - The type of the second element.

public class Pair<E,F>
extends java.lang.Object

Utility 'generalised' class representing a pair of values with not necessarily identical types.

Author:

Paulo G.S. da Fonseca

Field Summary

E	first The first element
F	second The second element

Constructor Summary

Pair()
Creates a new (null,null) pair.

Pair(E first, F second)
Creates a new pair with specified elements.

Method Summary

boolean	contains(java.lang.Object o) Checks if the pair contains one given element.
boolean	equals(java.lang.Object other)
java.lang.Object	get(int index) Gets an element from its index: 0=first, 1=second.
int	hashCode()
Pair<F,E>	invert() Creates a new pair with the same elements of this pair in inversed order.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

first

public E first

The first element

second

public F second

The second element

Constructor Detail

Pair

public Pair()

Creates a new (null,null) pair.

Pair

public Pair(E first,
            F second)

Creates a new pair with specified elements.

Parameters:

first - The first element.

second - The second element.

Method Detail

get

public java.lang.Object get(int index)

Gets an element from its index: 0=first, 1=second.

Parameters:

index - The index of the element.

Throws:

java.lang.IndexOutOfBoundsException

invert

public Pair<F,E> invert()

Creates a new pair with the same elements of this pair in inversed order.

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

contains

public boolean contains(java.lang.Object o)

Checks if the pair contains one given element.