Discussion
Sample52 is run - what will be the output?
import java.util.concurrent.*;
public class Sample52
{
public static void main(String[] args) throws Exception
{
ExecutorService pool = Executors.newFixedThreadPool(2);
Future<?> f = pool.submit(() -> System.out.print("ran "));
System.out.print(f.get() + " ");
pool.shutdown();
System.out.print(pool.isShutdown());
}
}
Answer: D
Submitting a Runnable gives a Future whose get returns null once the task has finished, because a Runnable produces no value. The get also guarantees the task's own output comes first. shutdown returns immediately and isShutdown then reports true.
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