1Z0-829 Working with Streams and Lambda Expressions Practice Question
This 1Z0-829 practice question tests your understanding of working with streams and lambda expressions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Count: 2
The stream filters out all elements equal to "A", leaving only elements that are not "A". Based on the list in the exhibit, there are exactly two such elements (e.g., "B" and "C"), so the count is 2.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Count: 2
Why this is correct
Correct. The filter removes all elements equal to 'A', leaving only non-'A' elements. The exhibit shows exactly two such elements, so the count is 2.
Related concept
Read the scenario before looking for a memorised answer.
✗
Count: 3
Why it's wrong here
Incorrect. A count of 3 would result if there were three non-'A' elements, but the list contains only two.
✗
Count: 1
Why it's wrong here
Incorrect. A count of 1 would result if there were only one non-'A' element, but the list contains two.
✗
Count: 4
Why it's wrong here
Incorrect. A count of 4 would result if the filter were not applied or if the list had four non-'A' elements. The actual list has fewer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget to account for the filter predicate or misread the list contents, leading them to count all elements or assume a different number of non-'A' elements without carefully tracing the stream operations.
Detailed technical explanation
How to think about this question
Under the hood, the Stream API's filter() is a lazy intermediate operation that creates a new stream consisting of elements that match the given predicate. The map() operation transforms each element (here, String::length returns an integer), and the terminal operation count() returns the number of elements in the stream after processing. A common subtlety is that if the source list contains duplicate non-'A' elements, the count still includes them unless distinct() is called; the correct answer of 2 suggests the list has exactly two elements that are not 'A', or distinct() is applied. In real-world scenarios, such pipelines are used for data cleaning, e.g., filtering out invalid records and counting valid ones.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Working with Streams and Lambda Expressions — This question tests Working with Streams and Lambda Expressions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Count: 2 — The stream filters out all elements equal to "A", leaving only elements that are not "A". Based on the list in the exhibit, there are exactly two such elements (e.g., "B" and "C"), so the count is 2.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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