What is the difference between List and Set in Java?

What is the difference between List and Set in Java?

In Java, a List is an ordered collection that allows duplicate elements, while a Set is an unordered collection that does not allow duplicates.

Can you give me examples of when to use each?

Sure! Use a List when you need to maintain the order of elements or allow duplicates, like a shopping list. Use a Set when you want to ensure all elements are unique, like a collection of unique user IDs.

What are the common implementations of List and Set?

Common implementations of List include ArrayList and LinkedList. For Set, common implementations are HashSet and TreeSet.

Are there any performance differences between them?

Yes, Lists generally have faster access times for indexed elements, while Sets have faster operations for checking existence and adding elements due to their unique nature.