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Exam 1z0-809 topic 1 question 162 discussion

Actual exam question from Oracle's 1z0-809

Question #: 162
Topic #: 1

Given the code fragment:
List<Double> doubles = Arrays.asList (100.12, 200.32);
DoubleFunction funD = d ""> d + 100.0;
doubles.stream (). forEach (funD); // line n1 doubles.stream(). forEach(e ""> System.out.println(e)); // line n2
What is the result?

A. A compilation error occurs at line n2.
B. 200.12 300.32
C. 100.12 200.32
D. A compilation error occurs at line n1.

Show Suggested Answer

Suggested Answer: A 🗳️

by pul26 at Dec. 9, 2020, 4:55 p.m.

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6c84cb9

9 months, 3 weeks ago

Answer: D. Due to a type mismatch in the first forEach (on line n1), compilation will fail with an error. So the correct answer is: D. A compilation error occurs at line n1.

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steefaand

1 year, 4 months ago

Selected Answer: D

D is answer. Tested, forEach accepts Consumer or BiConsumer.

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WilsonKKerll

3 years, 3 months ago

line n1 ->> doubles.stream().map(x -> funD.apply(x)).forEach(System.out::println);

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mevlt

3 years, 3 months ago

Answer is D. forEach is a void method however DoubleFunction return double values

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Svetleto13

4 years, 1 month ago

D,tested.Required type Consumer,provided DoubleFunction on line 1-forEach (funD);

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jduarte

4 years, 5 months ago

Answer is D

upvoted 3 times

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Abdullah_Rahahleah

4 years, 6 months ago

forEach takes consumer not function

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pul26

4 years, 6 months ago

Sorry I meant Answer is D

upvoted 3 times

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pul26

4 years, 6 months ago

Answer is A public static void main(String[] args) { List<Double> doubles = Arrays.asList (100.12, 200.32); DoubleFunction funD = d -> d + 100.0; // compile error doubles.stream ().jmsforEach(funD); // line n1 doubles.stream(). forEach(e -> System.out.println(e)); // line n2 }

upvoted 1 times

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