1Z0-829 Working with Streams and Lambda Expressions Practice Question
Exhibit
List<Integer> numbers = List.of(10, 20, 30, 40, 50);
Optional<Integer> result = numbers.stream()
.filter(n -> n > 100)
.findFirst();
System.out.println(result.orElse(-1));Refer to the exhibit. What is the output?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
-1
The filter n > 100 yields an empty stream. findFirst returns an empty Optional. orElse(-1) returns -1.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
10
Why it's wrong here
Incorrect; no element satisfies condition.
- ✗
null
Why it's wrong here
orElse returns -1, not null.
- ✓
-1
Why this is correct
Correct.
- ✗
Optional.empty
Why it's wrong here
Incorrect; the code prints -1, not the Optional.
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