How can I optimize Java collections for better performance?

How can I optimize Java collections for better performance?

To optimize Java collections, consider using the right collection type for your needs, like ArrayList for fast access or HashMap for quick lookups.

What are the differences between ArrayList and LinkedList?

ArrayList is backed by an array, providing fast random access, while LinkedList uses a doubly linked list, which is better for frequent insertions and deletions.

When should I use a HashSet instead of a List?

Use a HashSet when you need unique elements and fast lookups, while a List is better when you need to maintain order or allow duplicates.

Are there any performance trade-offs I should be aware of?

Yes, each collection type has its own performance characteristics. For example, HashMap has O(1) average time complexity for get and put operations, but can degrade to O(n) in worst-case scenarios.