1Z0-829 Working with Streams and Lambda Expressions Practice Question
Which of the following is a terminal operation of the Stream API?
⚠ Common exam trap
Candidates often confuse peek() with forEach() because both can perform actions on elements, but peek() is intermediate and does not trigger stream processing, while forEach() is terminal and does.
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 correct because it is a terminal operation in the Stream API. Terminal operations produce a result or side effect and close the stream, meaning no further operations can be performed on the same stream. forEach() consumes each element of the stream and returns void, making it a terminal operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
map()
Why it's wrong here
map() is an intermediate operation.
- ✓
forEach()
Why this is correct
Correct. forEach() is a terminal operation.
- ✗
filter()
Why it's wrong here
filter() is an intermediate operation.
- ✗
peek()
Why it's wrong here
peek() is an intermediate operation.
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