Quick Answer
The correct answer is Files.createDirectories(Path) and Files.createDirectory(Path), as both are valid static methods in the java.nio.file.Files class for creating directories using NIO.2. Files.createDirectory(Path) creates a single directory but throws an exception if its parent does not exist or if the target already exists, making it suitable for precise, one-level creation. In contrast, Files.createDirectories(Path) creates the target directory along with any nonexistent parent directories, and silently succeeds if the directory already exists, offering greater flexibility. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this distinction tests your understanding of NIO.2 file operations and exception handling—a common trap is confusing these two methods or assuming only one is valid. Remember the memory tip: "Single for strict, plural for path"—createDirectory is strict about parents, while createDirectories handles the full path.
This 1Z0-829 practice question tests your understanding of java i/o api and securing applications. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which two of the following are valid methods to create a new directory using the NIO.2 Files class? (Select two.)
Files.mkdir(Path)
Why wrong: No such method; mkdir is in File class.
Files.createNewDirectory(Path)
Why wrong: No such method in Files class.
Files.createDirectory(Path)
Creates a single directory if parent exists.
Files.createDirectories(Path)
Creates directories including all necessary parent directories.
Files.makeDirectory(Path)
Why wrong: No such method.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Files.createDirectory(Path)
The Files class in the java.nio.file package provides two static methods for creating directories: createDirectory(Path) creates a single directory, failing if the parent does not exist or if the directory already exists; createDirectories(Path) creates the directory and any nonexistent parent directories, succeeding silently if the target already exists. Both are valid and commonly used for NIO.2 directory creation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Files.mkdir(Path)
Why it's wrong here
No such method; mkdir is in File class.
Files.createNewDirectory(Path)
Why it's wrong here
No such method in Files class.
Files.createDirectory(Path)
Why this is correct
Creates a single directory if parent exists.
Related concept
Read the scenario before looking for a memorised answer.
Files.createDirectories(Path)
Why this is correct
Creates directories including all necessary parent directories.
Related concept
Read the scenario before looking for a memorised answer.
Files.makeDirectory(Path)
Why it's wrong here
No such method.
Common exam traps
The trap here is that candidates confuse legacy java.io.File methods (mkdir, mkdirs) with NIO.2 Files methods, or misremember method names like createNewDirectory or makeDirectory, which do not exist in the Files class.
Detailed technical explanation
Under the hood, Files.createDirectory delegates to the underlying file system provider's createDirectory implementation, which maps to OS-level system calls like mkdir on Unix or CreateDirectory on Windows. Files.createDirectories is more robust for creating nested directory structures, as it iterates through the path components and creates each missing directory, handling race conditions by checking existence before creation. In real-world scenarios, createDirectories is preferred for ensuring a full directory tree exists before writing files, avoiding FileAlreadyExistsException when the target already exists.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
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..
The correct answer is: Files.createDirectory(Path) — The Files class in the java.nio.file package provides two static methods for creating directories: createDirectory(Path) creates a single directory, failing if the parent does not exist or if the directory already exists; createDirectories(Path) creates the directory and any nonexistent parent directories, succeeding silently if the target already exists. Both are valid and commonly used for NIO.2 directory creation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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