What is the equivalent of the C++ Pair in Java?

Question

Is there a good reason why there is no Pair in Java? What would be the equivalent of this C++ construct? I would rather avoid reimplementing my own.<

Answer 1

Here are some libraries that have multiple degrees of tuples for your convenience:

• JavaTuples. Tuples from degree 1-10 is all it has.
• JavaSlang. Tuples from degree 0-8 and lots of other functional goodies.
• jOOλ. Tuples from degree 0-16 and some other functional goodies. (Disclaimer, I work for the maintainer company)
• Functional Java. Tuples from degree 0-8 and lots of other functional goodies.

Other libraries have been mentioned to contain at least the Pair tuple.

Specifically, in the context of functional programming which makes use of a lot of structural typing, rather than nominal typing (as advocated in the accepted answer), those libraries and their tuples come in very handy.