A Java collection of value pairs? (tuples?)

Question

I like how Java has a Map where you can define the types of each entry in the map, for example .

What I\'m looking for is a type

Answer 1

Expanding on the other answers a generic immutable Pair should have a static method to avoid cluttering your code with the call to the constructor:

class Pair {
      final L left;
      final R right;

      public Pair(L left, R right) {
        this.left = left;
        this.right = right;
      }

      static  Pair of(L left, R right){
          return new Pair(left, right);
      }
}

if you name the static method "of" or "pairOf" the code becomes fluent as you can write either:

    list.add(Pair.of(x,y)); // my preference
    list.add(pairOf(x,y)); // use with import static x.y.Pair.pairOf

its a real shame that the core java libraries are so sparse on such things that you have to use commons-lang or other 3rd parties to do such basic stuff. yet another reason to upgrade to scala...