Oracle Exam 1Z0-809 Topic 16 Question 61 Discussion

Actual exam question for Oracle's 1Z0-809 exam

Question #: 61
Topic #: 16

[All 1Z0-809 Questions]

Given:

IntStream stream = IntStream.of (1,2,3);

IntFunction 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?

AReplace line n1 with:IntFunction<UnaryOperator> inFu = x -> y -> x*y;

BReplace line n1 with:IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;

CReplace line n1 with:BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;

DReplace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10));

Show Suggested Answer

Suggested Answer: D

by Lashawna at Apr 30, 2024, 02:02 PM

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Xuan

4 days ago

The correct answer is D. We need to use the applyAsInt() method since the IntFunction is expecting an Integer parameter, not a UnaryOperator or IntUnaryOperator.

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Remedios

20 days ago

I'm not sure, but I think the rationale for B is that IntUnaryOperator is the correct functional interface for the lambda expression used in the code.

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Nydia

23 days ago

I disagree, I believe the correct answer is A.

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Keith

28 days ago

I think the correct answer is B.

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