Given the code fragment: ExecutorService executorService = Executors.newSingleThreadExecutor(); Set<Callable<String>> workers = new HashSet<Callable<String>>(); workers.add(new Callable<String>() {…

Question

Options

• AList<Future<String>> futures = executorService.invokeAny(workers); for(Future<String> future : futures){ System.out.println(future.get()); }
• BexecutorService.submit(cThreads);
• CList<Future<String>> futures = executorService.invokeAll(workers); for(Future<String> future : futures){ System.out.println(future.get()); }
• Dfor (int i=0; i<3;i++){ String result = executorService.invokeAny(cThreads); System.out.println(result); }

• B
  3% (1)
• C
  94% (31)
• D
  3% (1)

Explanation

The code fragment in Option C invokes all callable objects in the workers set by using the ExecutorService's invokeAll() method. This method takes a collection of Callable objects and returns a List of Future objects representing the results of the tasks. The other options are incorrect because they either use the wrong method (invokeAny() or submit()) or have syntax errors (missing parentheses or semicolons). Reference: AbstractExecutorService (Java SE 17 & JDK 17) - Oracle

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