Re: when will Tuple be std?

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.help
Date:
Fri, 28 Dec 2007 09:15:49 -0500
Message-ID:
<YtSdnYZRmeuImOjanZ2dnUVZ_oaonZ2d@comcast.com>
apm35@student.open.ac.uk wrote:

I have the need for a Tuple in my java program and hoped it would be
there as std. I cannot find it.


A sexually-transmitted disease?

I have found the project, http://javatuple.com/index.shtml, which is
useful and encouraging, but I wonder how long it will be before Tuple
is std.


Never, but it only takes about ten minutes to write one.

public class Pair <T, U>
{
  private final T first;
  private final U second;
  public Pair ( T t, U u )
  {
    first = t;
    second = u;
  }
  public final T getFirst() { return first; }
  public final U getSecond() { return second; }

  @SuppressWarnings ("unchecked" )
  @Override public boolean equals( Object oth )
  {
    if ( this == oth ) { return true; }
    if ( ! (oth instanceof Pair) ) { return false; }
    Pair <T, U> pair = (Pair<T, U>) oth;
    return (first == null? pair.first == null : first.equals( pair.first ))
      && (second == null? pair.second == null : second.equals( pair.second ));
  }
  @Override public int hashCode()
  {
    return first.hashCode() * 31 + second.hashCode();
  }
}

There you go, all your googling satisfied.

--
Lew

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