Given the code fragments:

class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable"); }
}

class ThreadCaller implements Callable {
public String call () throws Exception {return "Callable"; }
}

and

ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// Line n1
es.shutdown();

Which code fragment can be inserted at line n1 to start r1 and c1 threads?

Question

Given the code fragments:

class ThreadRunner implements Runnable {
 public void run () { System.out.print ("Runnable"); }
}

class ThreadCaller implements Callable {
 public String call () throws Exception {return "Callable"; }
}

and

ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// Line n1
es.shutdown();

Which code fragment can be inserted at line n1 to start r1 and c1 threads?

Accepted Answer

D. es.submit(r1); Future<String> f1 = es.submit (c1);

Answer

A. Future f1 = (Future) es.submit (r1); es.execute (c1);

Answer

B. es.execute (r1); Future<String> f1 = es.execute(c1);

Answer

C. Future f1 = (Future) es.execute(r1); Future f2 = (Future) es.execute(c1);

Given the code fragments: class ThreadRunner implements Runnable { public void run () { System.out.print ("Runnable"); } } class ThreadCaller implements Callable { public String call () throws…

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