The correct choice is `Files.move()` with `StandardCopyOption.ATOMIC_MOVE`, because it guarantees that the file replacement on the destination file system is all-or-nothing — either the entire move succeeds or the original state remains intact, preventing partial writes or inconsistent states on remote network drives. This leverages the underlying file system’s atomic rename capabilities, such as those supported by NFS or SMB, making it the only safe approach for atomic file operations in Java NIO.2. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of file system guarantees versus application-level copying; a common trap is assuming `FileChannel.transferTo()` or `Files.copy()` with `REPLACE_EXISTING` are atomic, but they are not. Remember the mnemonic: “Move it atomically, or don’t move it at all” — only `ATOMIC_MOVE` ensures no intermediate state is visible.
1Z0-829 Java I/O API and Securing Applications Practice Question
This 1Z0-829 practice question tests your understanding of java i/o api and securing applications. 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.
A Java application uses FileChannel to copy a file to a remote network drive. The developer wants to ensure atomic file replacement on the destination. Which approach is correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Files.move() with StandardCopyOption.ATOMIC_MOVE.
Option B is correct because `Files.move()` with `StandardCopyOption.ATOMIC_MOVE` guarantees that the file replacement on the destination file system is atomic — either the entire move succeeds or the original state remains intact. This is essential for remote network drives where partial writes or concurrent access could leave the destination in an inconsistent state. The `ATOMIC_MOVE` option leverages file system–level atomic rename operations (e.g., NFS or SMB support) to ensure no intermediate state is visible.
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.
✗
Delete the destination file, then rename the temporary file.
Why it's wrong here
Not atomic; another process may see missing file.
✓
Use Files.move() with StandardCopyOption.ATOMIC_MOVE.
Why this is correct
Requests atomic move; throws exception if not supported.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use FileChannel.transferTo() to write directly.
Why it's wrong here
Transfers data but no atomicity guarantee.
✗
Use Files.copy() with REPLACE_EXISTING option.
Why it's wrong here
Copy is not atomic; replace may happen mid-operation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume `Files.copy()` with `REPLACE_EXISTING` or `FileChannel.transferTo()` provides atomicity because they replace the destination, but neither guarantees that the replacement is atomic — only `ATOMIC_MOVE` ensures the entire operation is indivisible at the file system level.
Detailed technical explanation
How to think about this question
Under the hood, `ATOMIC_MOVE` maps to the operating system's `rename()` or `MoveFileEx()` with `MOVEFILE_REPLACE_EXISTING` on Windows, or `renameat2()` with `RENAME_EXCHANGE` on Linux, which are guaranteed atomic by the file system. On network file systems like NFSv3 or SMB2+, atomic rename is typically supported, but if the underlying file system does not support atomic moves, `Files.move()` with `ATOMIC_MOVE` will throw an `AtomicMoveNotSupportedException`, forcing the developer to handle fallback logic. A real-world scenario is updating a configuration file on a shared network drive where multiple clients read the file — atomic move ensures they never see a partially written or missing file.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Java I/O API and Securing Applications — This question tests Java I/O API and Securing Applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Files.move() with StandardCopyOption.ATOMIC_MOVE. — Option B is correct because `Files.move()` with `StandardCopyOption.ATOMIC_MOVE` guarantees that the file replacement on the destination file system is atomic — either the entire move succeeds or the original state remains intact. This is essential for remote network drives where partial writes or concurrent access could leave the destination in an inconsistent state. The `ATOMIC_MOVE` option leverages file system–level atomic rename operations (e.g., NFS or SMB support) to ensure no intermediate state is visible.
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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