"IllegalArgumentException: Argument is not an array" error in processing when using append-CodePudding

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?

CodePudding user response：

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));