Java OCA OCP Practice Question 2816

Question

What is the output of the following code? 

import java.io.Closeable;

public class Main {
   static class Door implements AutoCloseable {
      public void close() {
         System.out.print("D");
      }// ww w.ja v a  2s . c  o m
   }

   static class Window implements Closeable {
      public void close() {
         System.out.print("W");
         throw new RuntimeException();
      }
   }

   public static void main(String[] args) {
      try (Door d = new Door(); Window w = new Window()) {
         System.out.print("T");
      } catch (Exception e) {
         System.out.print("E");
      } finally {
         System.out.print("F");
      }
   }
}

A.  TWF
B.  TWDF
C.  TWDEF
D.  TWF followed by an exception
E.  TWDF followed by an exception
F.  TWEF followed by an exception
G.  The code does not compile.



C.

Note

After opening both resources in the try-with-resources statement, T is printed.

Then the try-with-resource completes and closes the resources in reverse order from which they were opened.

After W is printed, an exception is thrown.

However, the remaining resource is still closed and D is printed.

The exception thrown is then caught and E is printed.

Last, the finally block is run, printing F.

Therefore the answer is TWDEF.




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