What are the performance differences between Java collections?

What are the performance differences between Java collections?

Java collections include various types like ArrayList, LinkedList, HashSet, and TreeSet. Each has different performance characteristics depending on operations like insertion, deletion, and access.

Can you explain when to use ArrayList over LinkedList?

Use ArrayList when you need fast random access and fewer insertions/deletions. LinkedList is better for frequent insertions/deletions.

How does HashSet compare to TreeSet in terms of performance?

HashSet offers constant time performance for basic operations, while TreeSet provides log(n) time for operations due to its sorted nature.

What about the memory usage of these collections?

ArrayList has a lower memory overhead compared to LinkedList, which uses more memory due to storing pointers for each element.