Question 330 of 509

Controlling Program Flow →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to replace the while loop with a traditional for loop that uses an early break upon finding the first match, and defer the logging to a separate batch process. This approach directly addresses the two main performance drains: unnecessary iteration and expensive I/O overhead. By breaking out of the loop as soon as the first APPROVED transaction with amount over 1000 is found, you eliminate processing of the remaining millions of records. Simultaneously, moving the logging out of the loop and into a batch operation reduces the cost of repeated file writes, which is a classic example of optimizing loop performance with early break and batch I/O. On the Oracle Certified Professional Java SE 17 Developer exam, this scenario tests your understanding of control flow optimization and I/O cost awareness—a common trap is assuming parallelism (like parallel streams) will help, but that introduces ordering and thread-management overhead for a sequential-first search. Memory tip: “Break early, log later—don’t let I/O be the bottleneck.”

1Z0-829 Controlling Program Flow Practice Question

This 1Z0-829 practice question tests your understanding of controlling program flow. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

A financial application processes a daily batch of 10 million transactions. Each transaction is an object with fields: id, amount, and status (an enum: PENDING, APPROVED, REJECTED). The requirement is to find the first APPROVED transaction with amount greater than 1000. The current implementation uses a while loop with a nested if-else structure that checks each transaction sequentially. The loop also logs each transaction status, which involves a moderately expensive file write operation. Performance analysis shows the method is a bottleneck, often taking over 12 seconds. The development team is considering refactoring. Which course of action will most effectively reduce execution time while maintaining the requirement?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

Question 1hardmultiple choice

Full question →

A
Refactor the while loop into a recursive method that processes one transaction per call and stops when the condition is met.
Why wrong: Recursion adds method call overhead and risk of stack overflow for large datasets; not an optimization.
B
Replace the while loop with a parallel stream and use findFirst() to get the first matching transaction.
Why wrong: Parallel streams introduce synchronization overhead and may not preserve encounter order efficiently, making it slower for this sequential search.
C
Replace the while loop with a for-each loop that breaks when the condition is met, but keep the logging inside the loop.
Why wrong: The break improves performance but the logging I/O still occurs for all transactions until the match is found, which is the main bottleneck.
D
Replace the while loop with a traditional for loop that uses a break when the first match is found, and defer the logging to a separate batch process after the loop.
Early break reduces iterations, and removing logging I/O from the loop drastically improves performance. Batch logging can be done asynchronously.

Full breakdown with real-world context →

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

✓

Replace the while loop with a traditional for loop that uses a break when the first match is found, and defer the logging to a separate batch process after the loop.

Option C is correct because early break stops iteration as soon as the first matching transaction is found, skipping remaining transactions. Additionally, moving the logging operation outside the loop, perhaps to a batch logger, reduces I/O overhead significantly. Option A is wrong because parallel streams add overhead for thread management and ordering requirements; the first match in parallel requires careful handling and may not return the first in source order. Option B is wrong because using a for-each loop with break is essentially similar to the while loop and does not address the logging issue. Option D is wrong because recursion adds stack overhead and is not suitable for large datasets, and it does not address the logging either.

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.

✗
Refactor the while loop into a recursive method that processes one transaction per call and stops when the condition is met.
Why it's wrong here
Recursion adds method call overhead and risk of stack overflow for large datasets; not an optimization.
✗
Replace the while loop with a parallel stream and use findFirst() to get the first matching transaction.
Why it's wrong here
Parallel streams introduce synchronization overhead and may not preserve encounter order efficiently, making it slower for this sequential search.
✗
Replace the while loop with a for-each loop that breaks when the condition is met, but keep the logging inside the loop.
Why it's wrong here
The break improves performance but the logging I/O still occurs for all transactions until the match is found, which is the main bottleneck.
✓
Replace the while loop with a traditional for loop that uses a break when the first match is found, and defer the logging to a separate batch process after the loop.
Why this is correct
Early break reduces iterations, and removing logging I/O from the loop drastically improves performance. Batch logging can be done asynchronously.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 1Z0-829 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 1Z0-829 question test?

Controlling Program Flow — This question tests Controlling Program Flow — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Replace the while loop with a traditional for loop that uses a break when the first match is found, and defer the logging to a separate batch process after the loop. — Option C is correct because early break stops iteration as soon as the first matching transaction is found, skipping remaining transactions. Additionally, moving the logging operation outside the loop, perhaps to a batch logger, reduces I/O overhead significantly. Option A is wrong because parallel streams add overhead for thread management and ordering requirements; the first match in parallel requires careful handling and may not return the first in source order. Option B is wrong because using a for-each loop with break is essentially similar to the while loop and does not address the logging issue. Option D is wrong because recursion adds stack overhead and is not suitable for large datasets, and it does not address the logging either.

What should I do if I get this 1Z0-829 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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