Use Vector, it's much faster than creating your own dynamic array in terms of processing speed and the code will be a lot cleaner.
Code:

Vector stuff;
void setup(){
  stuff = new Vector();
  stuff.add(new Integer(65));
  stuff.add(new Float(3.6));
  println("My dynamic array has "+stuff.size()+" objects in it");
  Integer foo = (Integer)stuff.remove(0);
  println("I have removed the first object which has a value of "+foo.intValue());
  println("My dynamic array now has "+stuff.size()+" objects in it");
}
 

The only weird thing about them is that you'll have to cast and copy them into a temporary object to use stuff in the Vector, but this doesn't slow things down at all. Plus you can use them to create a stack of objects like a pez dispenser, dropping out the first object and the rest shuffling into place.

this might be the wrong place but still a good change to advocate java5 once again. the code would magically tranform into this:

Code:

Vector<Float> stuff;

void setup() {
	  stuff = new Vector<Float> ();
	  stuff.add(65.0f);
	  stuff.add(3.6f);
	  println("My dynamic array has " + stuff.size() + " objects in it");
	  float foo = stuff.remove(0);
	  println("I have removed the first object which has a value of " + foo);
	  println("My dynamic array now has " + stuff.size() + " objects in it");
}
 

even nicer, eh?