1Z0-829 Java I/O API and Securing Applications Practice Question
Which interface is designed for recursively walking a file tree?
⚠ Common exam trap
Test-takers frequently confuse `DirectoryStream` (which iterates a single directory) with a recursive walker, or they mistakenly think `FileFilter` or `FilenameFilter` can handle recursion, when in fact they only filter entries in a single directory listing.
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
✓
FileVisitor [CORRECT]
The `FileVisitor` interface is designed for recursively walking a file tree, as it provides callback methods (`preVisitDirectory`, `postVisitDirectory`, `visitFile`, `visitFileFailed`) that are invoked during a depth-first traversal of a file tree, typically used with `Files.walkFileTree()`. This allows you to process each file and directory in the tree, including subdirectories, making it the correct choice for recursive file tree walking.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DirectoryStream [wrong]
Why it's wrong here
DirectoryStream is used to iterate over entries in a single directory, not recursively.
- ✗
FilenameFilter [wrong]
Why it's wrong here
FilenameFilter is used to filter files in a directory listing, not for recursive walking.
- ✗
FileFilter [wrong]
Why it's wrong here
FileFilter is similar to FilenameFilter but filters File objects; it does not support recursion.
- ✓
FileVisitor [CORRECT]
Why this is correct
FileVisitor provides callback methods for recursive file tree traversal via Files.walkFileTree().
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