Calling instance method from value class constructor is a little confusing
Ethan McCue
ethan at mccue.dev
Sun Oct 26 03:12:41 UTC 2025
Just a note from playing with the EA build. Minimal example:
import java.util.ArrayList;
value class HittableList2 {
private final ArrayList<Object> objects
= new ArrayList<>();
HittableList2() {}
HittableList2(Object object) {
add(object);
}
void add(Object object) {
objects.add(object);
}
}
This gives the error
/Users/emccue/Development/raytracer/src/HittableList2.java:10: error:
cannot reference add(Object) before constructor has been called
add(object);
^
I know this means the superclass's constructor (and that I need to put an
explicit super() at the top of the method), but reading that straight
"cannot reference ... before constructor has been called - I'm in the
constructor!"
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