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Exam 1z0-809 topic 1 question 11 discussion

Actual exam question from Oracle's 1z0-809
Question #: 11
Topic #: 1
[All 1z0-809 Questions]

Given the code fragment:
Stream<List<String>> iStr= Stream.of (
Arrays.asList ("1", "John"),
Arrays.asList ("2", null));
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ()); nInSt.forEach (System.out :: print);
What is the result?

  • A. 1John2null
  • B. 12
  • C. A NullPointerException is thrown at run time.
  • D. A compilation error occurs.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by M_Jawad at Jan. 13, 2020, 12:36 p.m.

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Chosen Answer:
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Innovation
Highly Voted 4 years, 10 months ago
D, a compile error occurs. if we change "Stream<String> nInSt = iStr.flatMapToInt((x) -> x.stream ());" to "Stream<String> nInSt = iStr.flatMap((x) -> x.stream ());" then the output is 1John2null
upvoted 16 times
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asdfjhfgjuaDCV
Most Recent 8 months, 1 week ago
D is the correct answer
upvoted 1 times
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steefaand
9 months, 1 week ago
Selected Answer: D
D is correct since x.stream() return Stream of String and not int.
upvoted 1 times
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Shad657
1 year, 3 months ago
Compilation error: incompatible types: bad return type in lambda expression Stream<String> nInSt = iStr.flatMapToInt((x) -> x.stream()); ^ Stream<String> cannot be converted to IntStream
upvoted 2 times
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r1muka5
1 year, 8 months ago
The correct answer is D.
upvoted 1 times
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YasinGaber
2 years, 9 months ago
D, Compilation error at line: Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ());
upvoted 1 times
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M_Jawad
4 years, 10 months ago
answer is D , a compilation error
upvoted 1 times
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