1Z0-829 Java I/O API and Securing Applications Practice Question
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?
⚠ Common exam trap
Many candidates 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.
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
✓
Use Files.move() with StandardCopyOption.ATOMIC_MOVE.
`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.
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.
- ✗
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.
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