Exam 1z0-809 topic 1 question 2 discussion

B is correct

B is the answer: import java.util.function.IntFunction; import java.util.function.IntUnaryOperator; import java.util.stream.IntStream; public class Main { public static void main(String[] args) { IntStream stream = IntStream.of(1, 2, 3); IntFunction<IntUnaryOperator> inFu = x -> y -> x * y; // Replace with option B IntStream newStream = stream.map(inFu.apply(10)); // line n2 newStream.forEach(System.out::print); } }

The full of implement is IntFunction<IntUnaryOperator> inFu = new IntFunction<IntUnaryOperator>() { @Override public IntUnaryOperator apply(int value) { return new IntUnaryOperator() { @Override public int applyAsInt(int operand) { return value * operand; } }; } }; And it is a IntStream so map function will take IntUnaryOperation. So the inFu.apply(10) is correct return the IntUnaryOperation so the B is correct

Answer is definitely B. This is an example of higher order function where the function interface returns another function.

Correct answer is B. The function.apply() expects IntFunction<IntUnaryOperator>

Correct answer is B.

B, tested, but I think we need to change (System.output::print) to (System.out::print)

Correct answer is B,tested.