- A
Mark sensitive fields in a Serializable class as transient to prevent serialization.
Prevents sensitive data from being exposed in serialized streams, reducing the risk of data leakage.
- B
Use Scanner instead of BufferedReader when reading untrusted input.
Why wrong: Scanner does not inherently provide better security; both can be used safely with proper input validation.
- C
Always use BufferedReader for reading text files to improve performance.
Why wrong: Performance improvement is not a security practice; it's about efficiency.
- D
Use try-with-resources for any stream, reader, or writer to ensure automatic closure.
Guarantees resources are closed even if an exception occurs, preventing resource leaks that could lead to denial of service.
- E
Grant FilePermission in the security policy to restrict file access for untrusted code.
Why wrong: While related to security, this is a policy configuration, not a coding practice within the code itself.
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.
Which TWO are secure coding practices for Java I/O that help prevent resource leaks and unauthorized access? (Choose two.)
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
Mark sensitive fields in a Serializable class as transient to prevent serialization.
Option A is correct because marking sensitive fields as transient prevents them from being serialized, which mitigates the risk of exposing confidential data through serialization streams. This is a secure coding practice that directly addresses unauthorized access to sensitive information during I/O operations.
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.
- ✓
Mark sensitive fields in a Serializable class as transient to prevent serialization.
Why this is correct
Prevents sensitive data from being exposed in serialized streams, reducing the risk of data leakage.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Scanner instead of BufferedReader when reading untrusted input.
Why it's wrong here
Scanner does not inherently provide better security; both can be used safely with proper input validation.
- ✗
Always use BufferedReader for reading text files to improve performance.
Why it's wrong here
Performance improvement is not a security practice; it's about efficiency.
- ✓
Use try-with-resources for any stream, reader, or writer to ensure automatic closure.
Why this is correct
Guarantees resources are closed even if an exception occurs, preventing resource leaks that could lead to denial of service.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Grant FilePermission in the security policy to restrict file access for untrusted code.
Why it's wrong here
While related to security, this is a policy configuration, not a coding practice within the code itself.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle Java 17 exams often test the distinction between performance optimizations and security practices, so candidates may incorrectly select 'Always use BufferedReader' or 'Grant FilePermission' as security measures when they are actually about performance or access control misconfiguration.
Detailed technical explanation
How to think about this question
The transient modifier in Java serialization ensures that the field's value is not written to the default serialization stream, which is critical when objects are serialized to files or over networks. The try-with-resources statement automatically calls close() on any resource implementing AutoCloseable, even if an exception occurs, preventing resource leaks in I/O operations. In real-world scenarios, failing to mark sensitive fields as transient can lead to data breaches when serialized objects are persisted or transmitted.
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 practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
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: Mark sensitive fields in a Serializable class as transient to prevent serialization. — Option A is correct because marking sensitive fields as transient prevents them from being serialized, which mitigates the risk of exposing confidential data through serialization streams. This is a secure coding practice that directly addresses unauthorized access to sensitive information during I/O operations.
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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Last reviewed: Jul 4, 2026
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