Keeping Track Of Unnamed Objects

I want to make a top-down 2d shooting game using libgdx. There will be a lot of bullet objects that I want to keep track of and dispose when they go off the screen. I was thinking

Solution 1:

Using an object pool is a better approach.

The idea of an object pool is simple and fits perfectly for your needs in this case. The pool handles creating and storing the Bullet objects. All you have to do is to call the obtain method of the pool when you need a bullet (User shoots) and call the recycle method of the pool for this bullet when it's no longer needed in the game (Goes offscreen).

Here is a code example for a pool taken from AndEngine's source. You can use it to learn how it works and make your own pool class (Or use this one).