danbikel.util
Class Pair

java.lang.Object
  danbikel.util.Pair

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

SymbolPair

public class Pair
extends Object
implements Serializable

Provides a mechanism to group any two objects. Either or both objects may be null.

See Also:

Serialized Form

Field Summary

Object	first The first object in the pair.
Object	second The second object in the pair.

Constructor Summary

Pair()
Constructs a new Pair object with both data members set to null.

Pair(Object first, Object second)
Constructs a new Pair object with the specified two objects.

Method Summary

boolean	equals(Object obj) Returns true if and only if the specified object is an instance of Pair and if this.first and ((Pair)obj).first are either both null or are equal as determined by the equals method of this.first if this.second and ((Pair)obj).second are either both null or are equal as determined by the equals method of this.second
int	hashCode() Returns a hash code that is formed from the hash codes of the two objects of this pair.
String	toString() Returns a human-readable string representation of this pair of objects, of the form "Pair(" + first + ", " + second + ")"

Methods inherited from class java.lang.Object

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

Field Detail

first

public Object first

The first object in the pair.

second

public Object second

The second object in the pair.

Constructor Detail

Pair

public Pair()

Constructs a new Pair object with both data members set to null.

Pair

public Pair(Object first,
            Object second)

Constructs a new Pair object with the specified two objects.

Method Detail

equals

public boolean equals(Object obj)

Returns true if and only if

• the specified object is an instance of Pair and
• if this.first and ((Pair)obj).first are either both null or are equal as determined by the equals method of this.first
• if this.second and ((Pair)obj).second are either both null or are equal as determined by the equals method of this.second

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns a hash code that is formed from the hash codes of the two objects of this pair. If an object in this pair is null, then its effective hash code as calculated by this method is 0.

Overrides:

hashCode in class Object

toString

public String toString()

Returns a human-readable string representation of this pair of objects, of the form

 "Pair(" + first + ", " + second + ")" 

Overrides:

toString in class Object