List & Set Overview
Understand List vs Set: ordering, duplicates, and everyday operations. We will add, remove, search, and iterate with simple examples.
What are collections?
Collections hold groups of objects. List is ordered and index-based; Set focuses on membership and uniqueness. Pick based on the question you ask: order or uniqueness?
List vs Set — keys
- List: keeps insertion order, duplicates allowed, access by index.
- Set: no duplicates; order not guaranteed in HashSet.
- Choose List for sequences; choose Set to avoid duplicates and for fast membership checks.
All lessons in this course
- List & Set Overview
- Iterators & Enhanced for
- Collections Utilities