"IllegalArgumentException: Argument is not an array" error in processing when using append();

Question

My code is as so...

ArrayList<Ray> rays = new ArrayList<Ray>();

Particle() {
  for(int a=0; a < 360; a+=10) {
    append(rays, new Ray(position, radians(a)));
  }
}

I'm initializing an ArrayList of the class Ray. Then I run through a for loop and am attempting to append a new Ray() to the list. I get no errors in the editor but whenever I run the code I get the error message: IllegalArgumentException: Argument is not an array

I've looked around and nothing seems to answer my question. Why is this happening?

Sorry about that! I don't use Stack Overflow that often so I wasn't aware you could do that. — Procode238
– Procode238, Commented Sep 28, 2021 at 16:41

Rabbid76 · Accepted Answer · 2021-09-24 20:04:20Z

1

The append function is for use with arrays (e.g.: rays[]). However rays is an ArrayList. Hence, you need to use the add method:

~~append(rays, new Ray(position, radians(a)));~~

rays.add(new Ray(position, radians(a));

answered Sep 24, 2021 at 20:04

Rabbid76

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