android ArrayList and draw without for loop

Question

Can I call a function in ArrayList without having to use a for loop or is there a anthoer way of doing this I hope my example will make more sense.

   public class Fireball {

      public void draw(GL10 gl){
         draw(gl);
      }

public class Gameview {

   private ArrayList<FireBall> fireBall = new ArrayList<FireBall>();

   public draw(GL10 gl){
     //this is where I what to draw everthing in the ArrayList
       fireBall.getIndex(ALL).draw(gl)
    }
}

the reason I am asking is because I what to be able to add and remove fireball without having to worry about the computer speed thank you

zrgiu · Accepted Answer · 2012-03-12 07:35:43Z

1

Iterating through an ArrayList is not that cpu-consuming (although using vectors you could optimize even more), and even if you had a method of drawing multiple fireballs at once, that method would still iterate through the ArrayList just as you would.

answered Mar 12, 2012 at 7:35

zrgiu

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2 Comments

Thilo Over a year ago

Why would a Vector be faster than an ArrayList? If anything, is it not the other way around (because Vector has synchronization overhead)?

zrgiu Over a year ago

ah sorry, by vector i meant Fireball[]. Edit: I only now realized that what my professor called "vector" everybody else calls an "array" ...

Andreas · Accepted Answer · 2012-03-12 08:21:33Z

0

Since you're using an arraylist, you could use a while loop.
Just check is the contents of the list isn't null

ArrayList al = new ArrayList();
al.add("a");
al.add("b");
al.add("c");
al.add("d");
al.add("e");

int counter = 1;
while (!al.isEmpty()) {
   System.out.println(counter++ + ": " + al.toString());
   al.remove(0);
}

Output:

1: [a, b, c, d, e]
2: [b, c, d, e]
3: [c, d, e]
4: [d, e]
5: [e]

Advantage is that it uses less memory, since your deleting unused elements, but if you want to reuse the arraylist, you should just loop through the elements:

fireball.getIndex(ALL);
while (Fireball f : fireball) {
     f.draw(gl)
}

answered Mar 12, 2012 at 8:21

Andreas

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