Method tuple

onjava/Tuple.java:9–11

(A a, B b)

public class Tuple {
  public static <A, B> Tuple2<A, B> tuple(A a, B b) {
    return new Tuple2<>(a, b);
  }
  public static <A, B, C> Tuple3<A, B, C>
  tuple(A a, B b, C c) {
    return new Tuple3<>(a, b, c);