Consider the following code segment: ArrayList bulbs = new ArrayList (); bulbs. add (new Light ()); bulbs. remove (0); bulbs. add (new Light ()); Light b = new Light (); bulbs. add (1, b); bulbs. add (new Light ()); bulbs. remove (0); bulbs. add (new Light ()); bulbs. remove (2); bulbs. add (new Light ()); bulbs. add (1, new Light ()); After running the code, what is the size of bulbs?

To answer this, lets run through the code:

ArrayList bulbs = new ArrayList (); / / create a new empty list

bulbs. add (new Light ()); / / size of bulbs = 1

bulbs. remove (0); / / remove item at index 0. size of bulbs = 0

bulbs. add (new Light ()); / / size of bulbs = 1

Light b = new Light ();

bulbs. add (1, b); / / size of bulbs = 2

bulbs. add (new Light ()); / / size of bulbs = 3

bulbs. remove (0); / / remove bulb at index 0. Size of bulbs = 2

bulbs. add (new Light ()); size of bulbs = 3

bulbs. remove (2); / / remove bulb at index 2. size of bulbs = 2

bulbs. add (new Light ()); / / size of bulbs = 3

bulbs. add (1, new Light ()); / / inserted at position 1. size of bulbs = 4

The final answer. Size of bulbs = 4.