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JavaIntermediate#generics
JavaBeginner#collections
What is the difference between Collection and Collections?
Collection is the root interface of the collections framework (List, Set, Queue). Collections is a utility class with static helper methods like sort(), reverse(), unmodifiableList(), and synchronizedList().
Example
List<Integer> list = new ArrayList<>(List.of(3,1,2)); Collections.sort(list); // [1,2,3]