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Java: In Java, which comparison about CopyOnWriteArrayList is accurate?

Difficulty:

Easy

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

In Java, which comparison about CopyOnWriteArrayList is accurate?

  1. There is no practical difference in behavior, performance, or API design when CopyOnWriteArrayList is involved.
  2. The oldest option related to CopyOnWriteArrayList is always the right production choice regardless of context.
  3. Differences around CopyOnWriteArrayList are mostly cosmetic, so correctness and maintainability do not change.
  4. It is excellent for read-heavy workloads, while write-heavy workloads pay a large copying cost.

Hint

Focus on the behavior or tradeoff, not just the keyword.

Answer and rationale

Correct answer: D. It is excellent for read-heavy workloads, while write-heavy workloads pay a large copying cost.

It is excellent for read-heavy workloads, while write-heavy workloads pay a large copying cost. This is the comparison that usually separates memorization from understanding.

Track: Java