How can I optimize an ArrayList in Java?

How can I optimize an ArrayList in Java?

To optimize an ArrayList, consider using a LinkedList if you frequently add or remove elements. Also, ensure you set an initial capacity to avoid resizing.

What is the initial capacity, and how do I set it?

The initial capacity is the size of the ArrayList when it's created. You can set it using the constructor: new ArrayList<>(initialCapacity);.

Are there any performance implications of resizing an ArrayList?

Yes, resizing an ArrayList can be costly because it involves creating a new array and copying elements. It's best to set an appropriate initial capacity.

What about using other data structures instead of ArrayList?

If you need fast insertions and deletions, consider using LinkedList or HashSet. For sorted data, TreeSet or TreeMap might be better.