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Exam 1z0-809 topic 1 question 60 discussion

Actual exam question from Oracle's 1z0-809
Question #: 60
Topic #: 1
[All 1z0-809 Questions]

Given the code fragment:
List<String> nL = Arrays.asList("Jim", "John", "Jeff");
Function<String, String> funVal = s -> "Hello : ".contact(s); nL.Stream()
.map(funVal)
.peek(System.out::print);
What is the result?

  • A. Hello : Jim Hello : John Hello : Jeff
  • B. Jim John Jeff
  • C. The program prints nothing.
  • D. A compilation error occurs.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by thetech at Dec. 5, 2019, 9:42 a.m.

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speed045
Highly Voted 3 years, 8 months ago
Correct answer is C, since peek is an intermediate lazy operation which will not be evaluated unless the pipeline is ended with a terminating operation.
upvoted 6 times
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asdfjhfgjuaDCV
Most Recent 4 months, 3 weeks ago
C is the correct answer:tested
upvoted 1 times
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steefaand
5 months, 3 weeks ago
Selected Answer: C
C is correct, since there is no terminal operation and Stream is never run.
upvoted 1 times
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nikhil_3011
2 years, 6 months ago
Answer is C. if we use any terminal operation after peek like .count()( even though its bad o/p formatting) then the answer would be A.
upvoted 2 times
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Svetleto13
3 years, 2 months ago
Correct answer is C.If we replace peek with forEach answer is A
upvoted 4 times
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ayzo
3 years, 6 months ago
Answer is A tested: class Testing { public static void main (String[] args) throws IOException{ List<String> nL = Arrays.asList("Jim ", "John ", "Jeff"); Function<String, String> funVal = s -> "Hello : ".concat(s); nL.stream() .map(funVal) .forEach(s-> System.out.print (s)); } } output: Hello : Jim Hello : John Hello : Jeff
upvoted 1 times
pridemore
3 years, 5 months ago
there is no terminal operation .forEach() that was called
upvoted 1 times
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johnchen88
4 years, 6 months ago
The Correct Answer should be D; If ignore the typo of "Hello : ".contact(s), C is the correct answer
upvoted 1 times
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Innovation
4 years, 6 months ago
it prints nothing. if we change peek to forEach, the output would be Hello : JimHello : JohnHello : Jeff
upvoted 3 times
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Destroyer
4 years, 7 months ago
D is correct. We have no String.contact method
upvoted 1 times
M_Jawad
4 years, 6 months ago
it is String.concat
upvoted 1 times
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thetech
4 years, 8 months ago
Answer is C. Tested.
upvoted 3 times
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C (25%)
B (20%)
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