A normal ArrayList is automatically safe for concurrent writes from many threads.
Practice this question from Quiz: Java Concurrency, with options and an explanation.
Question
A normal ArrayList is automatically safe for concurrent writes from many threads.
Option A
True
CopyOnWriteArrayList is useful when iteration/read frequency greatly exceeds write frequency.
Option B — Correct answer
False
CopyOnWriteArrayList is useful when iteration/read frequency greatly exceeds write frequency.