Oracle Exam 1Z0-819 Topic 2 Question 86 Discussion

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

Question #: 86
Topic #: 2

[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 Jacob at Jul 12, 2024, 08:19 PM

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Latrice

4 months ago

I'm torn between B and C. Maybe I should just ask the compiler to decide for me, it's probably smarter than I am anyway.

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Dawne

4 months ago

Option B is the way to go! Gotta love those Java streams. Plus, the `orElse(0.0)` will ensure we get a valid result even if the player list is empty.

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Sage

3 months ago

Agreed! The `orElse(0.0)` part is crucial for handling empty player lists.

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Eulah

3 months ago

Definitely! Option B is the best choice for calculating the average score using Java streams.

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Rory

4 months ago

I think D is incorrect because it doesn't return the average directly.

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Alecia

5 months ago

Hmm, option D seems to be the simplest one. Why bother with `mapToDouble()` when we can just use `map()`?

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Tora

3 months ago

Let's go with option D then.

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Dannie

3 months ago

Yeah, mapToDouble() is unnecessary in this case.

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Tresa

4 months ago

I agree, using map() seems simpler.

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Hassie

4 months ago

I think option D is the best choice.

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Kimbery

5 months ago

I'm not sure, but I think A could also be a valid option.

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Kristofer

5 months ago

I'd go with option C. It's more straightforward and doesn't require the `orElse()` call.

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Dudley

4 months ago

I'm not sure, but I would go with option C for a more direct approach.

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Gerald

4 months ago

I agree with User1, option B seems like the right choice.

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Alaine

4 months ago

I think option B is the correct one.

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Kenneth

5 months ago

I disagree, I believe the correct answer is C.

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Kathryn

5 months ago

Option B looks good, but I'm not sure about the `orElse(0.0)` part. Shouldn't we handle the case where the stream is empty?

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Torie

4 months ago

You're right. Option B is the way to go. The `orElse(0.0)` is important for handling the empty stream case.

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Torie

5 months ago

I think option B is the correct one. The `orElse(0.0)` is used to handle the case where the stream is empty.

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Jaime

5 months ago

I think the answer is B.

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