A.A is a subtype of B.

B.A cannot be final.

C.B is a subtype of A.

D.B cannot be abstract.

E.A cannot be abstract.

F.B cannot be final.

A.9001: APPLICATION ERROR-9001-MyFile.txt

B.Compilations fails at Line 1.

C.

D.9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt
9001: APPLICATION ERROR-9001-MyFile.txt

A.The output will be exactly 2 1 3 4 5.

B.The program prints 1 4 2 3, but the order is unpredictable.

C.Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.

D.Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.

E.Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.

A.double avg = numbers.stream().parallel().averagingDouble(a -> a);

B.double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();

C.double avg = numbers.stream().mapToInt (i -> i).average().parallel();

D.double avg = numbers.stream().average().getAsDouble();

E.double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));

A.The compilation fails because there is no zero args constructor defined in class X.

B.The compilation fails because either class X or class Y needs to implement the toString() method.

C.The compilation fails because a final class cannot extend another class.

D.The compilation succeeds.