[Fierro]

I have never used arraylists before … I am trying to use each of the methods walls, update, drawMe and attractTo for each object in the arraylist.

How do I do it? What I have here is obviously not the way.

listSize = particle_list.size();

for (int i = 0; i < listSize; i++)
      {
         particle_list.attractTo( ourPlayer );
         particle_list.walls();
         particle_list.update(i);
         particle_list.drawMe();
      }

[ShikhaTan]

In order to access an element within an arraylist, you have to do arraylistname.get(index);

For your instance, what would probably make it work is the following:

listSize = particle_list.size();

for (int i = 0; i < listSize; i++)
{
         particle_list.get(i).attractTo( ourPlayer );
         particle_list.get(i).walls();
         particle_list.get(i).update(i);
         particle_list.get(i).drawMe();
}

[SapnaVishwas]

Also it isn’t necessary to create a variable just to store the list size.
Why not just compare i with particle_list.size(); ?

But as stated you need to use the .get() method.