Records and bi-directional relationships

[Gunnar Morling]

Hi all,

I was exploring the records feature in the latest 14 EA build a bit. An
interesting question came up in how records will work for
bi-directional relationships between two record types.

I found no way to instantiate such pair of records without creating a
temporary instance of one of the two (unlike with regular classes, where I
could wire the relationship from within the constructor of one). Did I miss
an alternative way to do so (see below for what I came up with)?

A related question: this program will raise a StackOverflowError in the
toString() method. Is this an accepted limitation?

Thanks,

--Gunnar

    public class RecordsBidi {
        public static void main (String... args) {
            Surface surface = new Surface(new Point(1, 2));
            System.out.println(surface);
        }

        record Point(int x, int y, Surface owning) {
            public Point(int x, int y) {
                this(x, y, null);
            }
        }

        record Surface(Point center) {
            public Surface(Point center) {
               this.center = new Point(center.x, center.y, this);
            }
        }
    }