What are the differences between HashSet and TreeSet in Java?

Can you explain the differences between HashSet and TreeSet in Java?

Sure! HashSet is an unordered collection that does not allow duplicate elements, while TreeSet is a sorted collection that also does not allow duplicates.

What are the performance differences between them?

HashSet offers constant time performance for basic operations like add, remove, and contains, while TreeSet has a logarithmic time complexity due to its underlying red-black tree structure.

When should I use one over the other?

Use HashSet when you need fast access and don't care about the order of elements. Use TreeSet when you need sorted elements.

Can you give me an example of how to use both?

Certainly! Here's a simple example:

HashSet<String> hashSet = new HashSet<>();
TreeSet<String> treeSet = new TreeSet<>();

hashSet.add("apple");
treeSet.add("banana");