public static <X, Y> Ref2<X, Y> makeSecond(Y second) {
Ref2<X, Y> a = new Ref2();
a.setSecond(second);
return a;
}
public static <X, Y> Ref2<X, Y> makeFirst(X first) {
Ref2<X, Y> a = new Ref2();
a.setFirst(first);
return a;
}