1Z0-829 Working with Streams and Lambda Expressions Practice Question
Which TWO of the following are terminal operations on a stream? (Choose two.)
⚠ Common exam trap
Many exam-takers confuse intermediate operations like `distinct`, `filter`, and `map` with terminal operations because they also process elements, but they do not produce a final result or side effect that terminates the stream.
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
✓
forEach
`forEach` is a terminal operation that consumes the stream, applying the provided action to each element and producing a side effect without returning a new stream. Option C is correct because `reduce` is a terminal operation that combines stream elements into a single result using an associative accumulation function, terminating the stream pipeline.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
forEach
Why this is correct
forEach is a terminal operation that performs an action on each element.
- ✗
distinct
Why it's wrong here
distinct is an intermediate operation that removes duplicates.
- ✓
reduce
Why this is correct
reduce is a terminal operation that performs a reduction on elements.
- ✗
filter
Why it's wrong here
filter is an intermediate operation that selects elements based on a predicate.
- ✗
map
Why it's wrong here
map is an intermediate operation that transforms elements.
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