The correct choice is to implement a FileVisitor using Files.walkFileTree and copy each file with COPY_ATTRIBUTES. This approach is necessary because Files.copy on a directory alone only copies the top-level directory entry, not its contents; by using Files.walkFileTree with a custom FileVisitor, you traverse the entire directory tree in depth-first order, allowing you to copy each file individually with StandardCopyOption.COPY_ATTRIBUTES to preserve file attributes like timestamps and permissions. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of recursive file operations and the NIO.2 API, often appearing as a trap where candidates mistakenly choose Files.copy with the RECURSIVE option—which does not exist—or overlook the need for a FileVisitor to handle subdirectories. A key memory tip: think “walk and copy” for recursive attribute preservation—Files.walkFileTree is your depth-first guide, and COPY_ATTRIBUTES keeps the metadata intact.
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 developer needs to copy a large directory tree from one location to another, preserving file attributes. Which method should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a FileVisitor using Files.walkFileTree and copy each file with COPY_ATTRIBUTES
Option B is correct because `Files.walkFileTree` with a custom `FileVisitor` allows you to recursively traverse a directory tree and copy each file individually using `Files.copy` with `StandardCopyOption.COPY_ATTRIBUTES`. This is necessary because `Files.copy` on a directory does not copy the directory tree recursively; it only copies the top-level directory entry. The `FileVisitor` pattern ensures that subdirectories and files are visited and copied in depth-first order, preserving file attributes at each step.
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.
Implement a FileVisitor using Files.walkFileTree and copy each file with COPY_ATTRIBUTES
Why this is correct
walkFileTree allows recursive traversal and attribute preservation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Files.walk() and then Files.copy() for each entry
Why it's wrong here
Files.walk returns a stream; using Files.copy on directories fails.
✗
Use FileUtils.copyDirectory from Apache Commons IO
Why it's wrong here
This is not part of standard Java SE; the question expects standard API.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `Files.copy` with `COPY_ATTRIBUTES` works recursively on directories, but it only copies the directory entry, not its contents, requiring a tree-walking approach like `Files.walkFileTree` to achieve a full recursive copy with attribute preservation.
Detailed technical explanation
How to think about this question
Under the hood, `Files.walkFileTree` uses a depth-first traversal via the `SimpleFileVisitor` or custom `FileVisitor` implementation, invoking `preVisitDirectory`, `visitFile`, and `postVisitDirectory` callbacks. When copying, you must create the target directory in `preVisitDirectory` and copy each file in `visitFile` with `COPY_ATTRIBUTES` to preserve metadata like last-modified time and permissions. A subtle behavior is that `Files.copy` with `COPY_ATTRIBUTES` does not copy all attributes (e.g., ACLs or extended attributes) on all platforms; for full preservation, you may need `Files.getFileAttributeView` and `Files.setAttribute`.
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: Implement a FileVisitor using Files.walkFileTree and copy each file with COPY_ATTRIBUTES — Option B is correct because `Files.walkFileTree` with a custom `FileVisitor` allows you to recursively traverse a directory tree and copy each file individually using `Files.copy` with `StandardCopyOption.COPY_ATTRIBUTES`. This is necessary because `Files.copy` on a directory does not copy the directory tree recursively; it only copies the top-level directory entry. The `FileVisitor` pattern ensures that subdirectories and files are visited and copied in depth-first order, preserving file attributes at each step.
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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