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. 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.
A developer is building a file synchronization tool that runs on multiple threads. Multiple threads may read and write to the same file concurrently. The developer wants to ensure that a thread does not read a file while another thread is writing to it, and that concurrent reads are allowed. Which locking mechanism 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
✓
Use java.nio.channels.FileLock with shared lock for reading and exclusive lock for writing.
Option D is correct because java.nio.channels.FileLock provides a platform-independent mechanism for locking files, supporting shared locks for concurrent reads and exclusive locks for writes. This ensures that a thread cannot read a file while another thread is writing to it, while allowing multiple threads to read simultaneously, which matches the requirement exactly.
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.
✗
Use a ReentrantReadWriteLock in Java with the file as a resource.
Why it's wrong here
ReentrantReadWriteLock is for in-memory synchronization, not for file-level locking across threads.
✗
Use synchronized blocks on the File object.
Why it's wrong here
Synchronized blocks cannot coordinate access across JVMs or even across threads if the File object is not shared appropriately.
✗
Use a Semaphore with permits equal to the number of threads.
Why it's wrong here
Semaphore does not differentiate between read and write operations.
✓
Use java.nio.channels.FileLock with shared lock for reading and exclusive lock for writing.
Why this is correct
FileLock with shared/exclusive modes allows concurrent reads and exclusive writes, and works across processes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse in-memory concurrency mechanisms (like ReentrantReadWriteLock or synchronized) with file-level locking, forgetting that file access across threads or processes requires OS-level coordination provided by FileLock.
Detailed technical explanation
How to think about this question
FileLock works at the operating system level, using the underlying file system's locking primitives (e.g., flock on Unix, LockFileEx on Windows). A shared lock allows multiple readers, while an exclusive lock blocks both readers and writers; the lock is held until the FileChannel is closed or the lock is released, and it is visible to other processes, making it suitable for multi-threaded and multi-process synchronization.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 java.nio.channels.FileLock with shared lock for reading and exclusive lock for writing. — Option D is correct because java.nio.channels.FileLock provides a platform-independent mechanism for locking files, supporting shared locks for concurrent reads and exclusive locks for writes. This ensures that a thread cannot read a file while another thread is writing to it, while allowing multiple threads to read simultaneously, which matches the requirement exactly.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 1Z0-829 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-829 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.