Discussion
Which of these correctly runs work asynchronously and returns a handle to the eventual result?
Answer: D
Correct answer: CompletableFuture<String> f = CompletableFuture.supplyAsync(() -> load());
supplyAsync takes a Supplier and returns a future of its result, which is what is wanted when the work produces a value. runAsync takes a Runnable and gives CompletableFuture<Void>, so it cannot carry the loaded string.
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