How do I choose the right data structures in Java?

How do I choose the right data structures in Java?

Choosing the right data structure in Java depends on your specific use case. Are you looking for speed, memory efficiency, or ease of use?

I need something that allows fast access and modification.

In that case, consider using an ArrayList for dynamic arrays or a HashMap for key-value pairs, as they offer average O(1) time complexity for access.

What about when I need to maintain order?

If maintaining order is crucial, you might want to use a LinkedList or a TreeSet, which keeps elements sorted.

Are there any built-in data structures I should avoid?

Avoid using Vector unless you need thread safety, as it is synchronized and can be slower than alternatives like ArrayList.