Vector stuff = new Vector();
int timer = 0;
void setup(){
  for(int i = 0; i < 10000; i++){
    stuff.add(new Thing());
  }
  timer = millis();
  for(int j = 0; j < 100; j++){
    for(int i = 0; i < stuf.size(); i++){
	Thing temp = (Thing)stuff.get(i);
	temp.plus();
    }
  }
  println("for i:" + (millis() - timer));
  timer = millis();
  for(int j = 0; j < 100; j++){
    for(Iterator iterator = stuff.iterator(); iterator.hasNext();){
	Thing temp = (Thing)iterator.next();
	temp.plus();
    }
  }
  println("iterator:" + (millis() - timer));
}

class Thing{
  int x;
  Thing(){
    x = 0;
  }
  void plus(){
    x++;
  }
}