Oracle Exam 1Z0-809 Topic 9 Question 40 Discussion

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

Question #: 40
Topic #: 9

[All 1Z0-809 Questions]

Given the code fragment:

List list1 = Arrays.asList(10, 20);

List list2 = Arrays.asList(15, 30);

//line n1

Which code fragment, when inserted at line n1, prints 10 20 15 30?

AStream.of(list1, list2).flatMap(list -> list.stream()).forEach(s -> System.out.print(s + '' ''));

BStream.of(list1, list2).flatMap(list -> list.intStream()).forEach(s -> System.out.print(s + '' ''));

Clist1.stream().flatMap(list2.stream().flatMap(e1 -> e1.stream()).forEach(s -> System.out.println(s + '' ''));

DStream.of(list1, list2).flatMapToInt(list -> list.stream()).forEach(s -> System.out.print(s + '' ''));

Show Suggested Answer

Suggested Answer: B

by Raymon at Feb 07, 2023, 06:21 AM

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Roy

1 months ago

I hope this exam doesn't require us to flatMap our brains to solve the problem!

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Lynette

2 months ago

Hmm, Option C looks a bit convoluted, I'll steer clear of that one.

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Lashon

5 days ago

D) Stream.of(list1, list2).flatMapToInt(list -> list.stream()).forEach(s -> System.out.print(s + '' ''));

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Lashon

12 days ago

B) Stream.of(list1, list2).flatMap(list -> list.intStream()).forEach(s -> System.out.print(s + '' ''));

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Lashon

1 months ago

A) Stream.of(list1, list2).flatMap(list -> list.stream()).forEach(s -> System.out.print(s + '' ''));

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Frankie

2 months ago

Option A seems like the most straightforward solution, but let me review the use of flatMap() just to be sure.

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Edda

Yes, flatMap() is used to flatten the elements of streams.

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Tammi

3 days ago

Option A seems like the most straightforward solution.

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Dorinda

12 days ago

So, Option A should work to print all elements from both lists.

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Nathalie

14 days ago

Yes, flatMap() is used to flatten the elements of streams.

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Helaine

2 months ago

Option A seems like the most straightforward solution.

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Sherly

2 months ago

I'm leaning towards Option D, but I want to double-check the flatMapToInt() method.

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Alona

1 months ago

Let's double-check the flatMapToInt() method just to be sure.

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Arminda

1 months ago

I think Option D is correct.

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Merissa

2 months ago

Option B looks promising, but I'm not sure about the use of intStream().

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Lino

18 days ago

A) Stream.of(list1, list2).flatMap(list -> list.stream()).forEach(s -> System.out.print(s + ' '));

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Aimee

20 days ago

B) Stream.of(list1, list2).flatMap(list -> list.intStream()).forEach(s -> System.out.print(s + ' '));

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Chery

1 months ago

A) Stream.of(list1, list2).flatMap(list -> list.stream()).forEach(s -> System.out.print(s + ' '));

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Lisandra

2 months ago

I'm not sure, but I think option D could also be correct because of flatMapToInt.

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Kaitlyn

2 months ago

I agree with Marla, because flatMap is used to flatten the elements of the stream.

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Marla

3 months ago

I think the correct answer is A.

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