Oracle Exam 1Z0-819 Topic 8 Question 77 Discussion

Actual exam question for Oracle's 1Z0-819 exam

Question #: 77
Topic #: 8

[All 1Z0-819 Questions]

Given:

You want to calculate the average of the Player's score.

Which statement inserted on line 1 will accomplish this?

Aplayers.stream().average().orElse(0.0);

Bplayers.stream().mapToInt(a -> a.score).average().orElse(0.0);

Cplayers.stream().mapToDouble(a -> a.score).average();

Dplayers.stream().map(a -> a.score).average();

Show Suggested Answer

Suggested Answer: B

by Jutta at Apr 09, 2024, 11:44 AM

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Val

6 months ago

I believe B is correct because it maps to Int and then calculates the average.

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Lauran

7 months ago

But B specifically maps to Int for score.

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Beula

7 months ago

I'm leaning towards C because it converts to double.

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Chandra

7 months ago

I disagree, I think it's D.

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Lauran

7 months ago

I think the answer is B.

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Jolene

8 months ago

Okay, let's break this down. We need to get the stream of players, and then somehow calculate the average of their scores. I'm pretty sure one of these options will do the trick.

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Rory

8 months ago

Ugh, these stream API questions are the bane of my existence. Why can't they just ask us to write some good old-fashioned for loops?

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Kris

8 months ago

Ooh, this is a tricky one. I'm not entirely sure about the difference between mapToInt, mapToDouble, and map. I'll have to think this through carefully.

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Nathalie

8 months ago

Haha, this is a classic Java 8 question. I remember struggling with these stream API questions when I was studying for the exam. But I think I've got it figured out now.

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Lenita

8 months ago

Hmm, let me think about this. I know we need to use the stream() method to get a stream of the players, but I'm not sure which specific method will give us the average.

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Latosha

8 months ago

This is a great question! I've been brushing up on my Java 8 stream API knowledge, so I think I've got a pretty good handle on this.

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Ling

7 months ago

No, I believe the answer is C.

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Rickie

7 months ago

I think the correct answer is B.

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