Question 343 of 509

Java I/O API and Securing Applications →hardMultiple SelectObjective-mapped

Quick Answer

The answer is using try-with-resources for any stream, reader, or writer to ensure automatic closure, and marking sensitive fields as transient to prevent unauthorized serialization. Try-with-resources guarantees that each resource opened in the try clause is closed automatically at the end of the statement, even if an exception occurs, which directly prevents resource leaks in Java I/O. The transient keyword, when applied to a field, excludes that field from the default serialization process, thereby blocking unauthorized access to sensitive data when an object is serialized. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, these two practices are frequently tested together as complementary secure coding techniques, with a common trap being to confuse runtime exception handling with resource closure or to assume that using a BufferedReader alone is a security practice. A useful memory tip is “Close and Hide”: try-with-resources closes the stream, transient hides the field.

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. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.)

Question 1hardmulti select

Full question →

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.

Full breakdown with real-world context →

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.

Using try-with-resources ensures that all resources are closed automatically, preventing resource leaks. Marking sensitive fields as transient prevents their serialization. Option C (using Scanner) is not inherently secure; Option D (BufferedReader) is fine but not specifically a security practice; Option E (FilePermission) is a security policy, not a coding practice.

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

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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.

Identify which 1Z0-829 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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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. — Using try-with-resources ensures that all resources are closed automatically, preventing resource leaks. Marking sensitive fields as transient prevents their serialization. Option C (using Scanner) is not inherently secure; Option D (BufferedReader) is fine but not specifically a security practice; Option E (FilePermission) is a security policy, not a coding practice.

What should I do if I get this 1Z0-829 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

2 more ways this is tested on 1Z0-829

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A developer is designing a service that processes multiple files concurrently. To avoid resource leaks, which practice is essential?

hard

A.Ensure each thread has its own copy of the file handle
✓ B.Use try-with-resources for each AutoCloseable resource
C.Call close() on each stream in a separate try-catch block
D.Use FileLock to prevent concurrent access

Why B: Option B is correct because try-with-resources guarantees that each AutoCloseable resource is closed automatically at the end of the statement, even if an exception occurs. This is essential when processing multiple files concurrently, as it prevents resource leaks without requiring explicit close() calls in finally blocks.

Variation 2. Which of the following correctly uses try-with-resources to ensure a FileInputStream is closed after use?

easy

A.FileInputStream fis = new FileInputStream("file.txt"); try { ... } finally { fis.close(); }
✓ B.try (FileInputStream fis = new FileInputStream("file.txt")) { ... }
C.try { FileInputStream fis = new FileInputStream("file.txt"); ... } finally { fis.close(); }
D.try (fis = new FileInputStream("file.txt")) { ... }

Why B: Option B is correct because it uses the try-with-resources syntax (try (resource declaration) { ... }), which automatically closes the FileInputStream when the block exits, regardless of exceptions. This ensures the resource is closed without requiring an explicit finally block, as mandated by the AutoCloseable interface.

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