Java Collections Framework

Collections Framework

Unified architecture for storing/manipulating groups of objects.

Collection Hierarchy

List list = new ArrayList<>();
Set set = new HashSet<>();
Map map = new HashMap<>();

list.add("Java");
set.add(1);
map.put("age", 25);

Key Points

• List: ordered, duplicates allowed.
• Set: unique elements only.
• Map: key-value pairs.
• Generics ensure type safety.