1z0-809 Exam - Question 113

The provided code creates an ExecutorService to run tasks concurrently. It defines two classes: R, which implements Runnable, and C, which implements Callable<String>. The code uses `es.execute(new R())` to run an instance of R, which prints 'Run...'. Next, it uses `es.submit(new C())` to run an instance of C, which returns 'Call...' and prints it out using `System.out.println(f1.get())`. Assuming exceptions are properly handled as implied in the code snippets, the output is 'Run... Call...'.