Exam 1z0-809 topic 1 question 41 discussion

Actual exam question from Oracle's 1z0-809

Question #: 41
Topic #: 1

Given the code fragment:
List<String> str = Arrays.asList ("my", "pen", "is", "your', "pen");
Predicate<String> test = s -> {
int i = 0;
boolean result = s.contains ("pen");
System.out.print(i++) + ":");
return result;
};
str.stream()
.filter(test)
.findFirst()
.ifPresent(System.out ::print);
What is the result?

A. 0 : 0 : pen
B. 0 : 1 : pen
C. 0 : 0 : 0 : 0 : 0 : pen
D. 0 : 1 : 2 : 3 : 4 :
E. A compilation error occurs.

Show Suggested Answer

Suggested Answer: A 🗳️

by Destroyer at Jan. 2, 2020, 7:16 a.m.

Comments

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Destroyer

Highly Voted 4 years, 12 months ago

Answer is A

upvoted 9 times

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Saurabhag

Highly Voted 4 years, 5 months ago

Correct Answer is A(tested)

upvoted 5 times

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asdfjhfgjuaDCV

Most Recent 9 months, 3 weeks ago

The correct answer is A.List<String> str = Arrays.asList ("my", "pen", "is", "your', "pen"); Check this once if it is correct then A

upvoted 1 times

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steefaand

10 months, 3 weeks ago

Selected Answer: A

Assuming that "your' is typo (using ' instead of ") answer is A, since variable i is created every time predicate is run and its value is always 0 because of post increment. And since value is found on 2nd iteration 0 is printed twice.

upvoted 1 times

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iSnover

11 months, 1 week ago

Selected Answer: D

The answer is D, because in the list "str" the fourth String is instantiated as "your' without double quotes as it should be. Correcting the error, the correct answer is A, pay attention to the test as the question may come with the model with compilation error or may come with the result "0 : 0 : pen"

upvoted 1 times

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r1muka5

1 year, 9 months ago

Answer A

upvoted 1 times

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wheredajuice

2 years, 9 months ago

It's A because of findFirst(), it only does the test for the first two elements, finds "pen" in the second position and terminates. Also notice "int i" is a local variable in the lambda, it always prints 0.

upvoted 2 times

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WilsonKKerll

2 years, 9 months ago

Answer is A. Because Predicate test() is one test with any element in List.

upvoted 1 times

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