1Z0-809: Java SE 8 Programmer II

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OCA: Oracle Certified Associate Java SE 8 Programmer II Practice Questions

Question: 1

Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y;//line n1
IntStream newStream = stream.map(inFu.apply(10));//line n2
newStream.forEach(System.out::print);

Which modification enables the code fragment to compile?
A. Replace line n1 with:IntFunction<UnaryOperator> inFu = x -> y -> x*y;
B. Replace line n1 with:IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
C. Replace line n1 with:BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
D. Replace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10));

Answer: B

Question: 2

Given the code fragment:
List<Integer> values = Arrays.asList (1, 2, 3);
values.stream ()
.map(n -> n*2)//line n1
.peek(System.out::print)//line n2
.count();

What is the result?
A. 246
B. The code produces no output.
C. A compilation error occurs at line n1.
D. A compilation error occurs at line n2.

Answer: A

Question: 3

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)
A. You expect that classes that implement your interfaces have many common methods or fields, or
require access modifiers other than public.
B. You expect that unrelated classes would implement your interfaces.
C. You want to share code among several closely related classes.
D. You want to declare non-static on non-final fields.
E. You want to take advantage of multiple inheritances of type.

Answer: B & E

Question: 4

What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
A. Encapsulation
B. Inheritance
C. Abstraction
D. Instantiation
E. Polymorphism

Answer: A