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Java: Which statement about CopyOnWriteArrayList is the strongest interview answer?

Difficulty:

Easy

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

Which statement about CopyOnWriteArrayList is the strongest interview answer?

  1. CopyOnWriteArrayList is mostly a naming style choice and has little effect on runtime or design.
  2. CopyOnWriteArrayList exists mainly to reduce the number of Java files in a project.
  3. CopyOnWriteArrayList makes a fresh backing array on writes so readers can iterate safely without explicit synchronization.
  4. CopyOnWriteArrayList matters only for frontend frameworks, not for core Java applications.

Hint

Start with the core rule behind CopyOnWriteArrayList.

Answer and rationale

Correct answer: C. CopyOnWriteArrayList makes a fresh backing array on writes so readers can iterate safely without explicit synchronization.

CopyOnWriteArrayList makes a fresh backing array on writes so readers can iterate safely without explicit synchronization. This is the base concept interviewers commonly test first.

Track: Java