Question 119 of 509

Control Flow and Loops →mediumMultiple ChoiceObjective-mapped

1Z0-811 Control Flow and Loops Practice Question

This 1Z0-811 practice question tests your understanding of control flow and loops. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 developer receives a ticket that a batch processing job is running indefinitely. The job reads records from a database and processes them in a loop. The code uses a while(true) loop with a break condition when a sentinel value is encountered. However, due to a data anomaly, the sentinel value is never reached, causing the loop to run forever. The developer needs to fix the loop to prevent infinite execution while still allowing processing of all records until the sentinel is reached. Which approach is most appropriate?

Clue words in this question

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

Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

A
Use a do-while loop that checks the condition at the end
Why wrong: A do-while loop would still run indefinitely if the sentinel is never set; it doesn't add a safety limit.
B
Change the loop to a for loop with a fixed range based on the expected number of records
Why wrong: The exact number of records may not be known and can change, making this approach inflexible.
C
Throw an exception when the loop runs too long
Why wrong: Throwing an exception is a poor way to handle this; it doesn't gracefully stop the loop and may cause job failure.
D
Add a counter variable and break after a maximum number of iterations
This limits the loop iterations, preventing infinite execution while still allowing normal processing.

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

✓

Add a counter variable and break after a maximum number of iterations

Option D is correct because adding a counter variable and breaking after a maximum number of iterations provides a safety net against infinite loops while still allowing the loop to process all records until the sentinel is reached under normal conditions. This approach is a common defensive programming technique in Java to handle unexpected data anomalies without altering the core loop logic.

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.

✗
Use a do-while loop that checks the condition at the end
Why it's wrong here
A do-while loop would still run indefinitely if the sentinel is never set; it doesn't add a safety limit.
✗
Change the loop to a for loop with a fixed range based on the expected number of records
Why it's wrong here
The exact number of records may not be known and can change, making this approach inflexible.
✗
Throw an exception when the loop runs too long
Why it's wrong here
Throwing an exception is a poor way to handle this; it doesn't gracefully stop the loop and may cause job failure.
✓
Add a counter variable and break after a maximum number of iterations
Why this is correct
This limits the loop iterations, preventing infinite execution while still allowing normal processing.
Clue confirmation
The clue word "never" 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

The trap here is that candidates may choose Option A (do-while) thinking it changes the evaluation timing, but the fundamental issue is the missing sentinel, not the loop structure, so the loop still runs indefinitely.

Detailed technical explanation

How to think about this question

In Java, a while(true) loop with a break condition is a common pattern for reading data until a sentinel, but it lacks a fallback for data corruption or missing sentinel. Adding a counter with a maximum iteration limit (e.g., based on the known maximum number of records or a configurable timeout) ensures the loop terminates even if the sentinel is never encountered, mimicking a bounded loop without sacrificing the flexibility of the sentinel-based design. This technique is often used in batch processing with JDBC ResultSet iteration or file parsing where the end-of-data marker might be missing due to anomalies.

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 1Z0-811 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.

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FAQ

Questions learners often ask

What does this 1Z0-811 question test?

Control Flow and Loops — This question tests Control Flow and Loops — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Add a counter variable and break after a maximum number of iterations — Option D is correct because adding a counter variable and breaking after a maximum number of iterations provides a safety net against infinite loops while still allowing the loop to process all records until the sentinel is reached under normal conditions. This approach is a common defensive programming technique in Java to handle unexpected data anomalies without altering the core loop logic.

What should I do if I get this 1Z0-811 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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