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Java: What deeper point about ExecutorService, Future, and CompletableFuture should a senior Java developer mention?

Difficulty:

Hard

Questions:

1

Time Limit:

2 minutes

Passing Score:

100%

Question

What deeper point about ExecutorService, Future, and CompletableFuture should a senior Java developer mention?

  1. At senior level, the right answer is that ExecutorService, Future, and CompletableFuture exists mostly for historical syntax reasons.
  2. At senior level, the JVM removes the tradeoffs around ExecutorService, Future, and CompletableFuture, so design choices barely matter.
  3. At senior level, any approach to ExecutorService, Future, and CompletableFuture is equally correct if it compiles and passes a small test.
  4. The deeper design question is where you place cancellation, timeouts, backpressure, and thread ownership rather than which API name sounds modern.

Hint

Look beyond syntax and explain the runtime, API, or design consequence.

Answer and rationale

Correct answer: D. The deeper design question is where you place cancellation, timeouts, backpressure, and thread ownership rather than which API name sounds modern.

The deeper design question is where you place cancellation, timeouts, backpressure, and thread ownership rather than which API name sounds modern. This is the kind of tradeoff-aware answer senior interviews usually expect.

Track: Java