The correct answer is to declare both resources in the try header with the FileInputStream first, followed by the BufferedInputStream wrapping it, as in `try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis))`. This is valid because the try-with-resources statement initializes resources in declaration order, so `fis` must exist before `bis` can reference it; forward references are not allowed, and any resource not listed in the header will not be automatically closed. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of the try-with-resources multiple resources declaration order and the rule that each resource must be declared independently, even when one wraps another—a common trap is assuming the wrapper alone suffices. Remember the memory tip: "Declare first, wrap second; if it’s not in the parentheses, it won’t close for you."
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 resource declaration order in try-with-resources is valid when both a FileInputStream and a BufferedInputStream wrapping it need to be closed automatically?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... }
Option A is correct: Both resources are declared in the try header, with fis declared before bis. Option B has a forward reference error. Option C does not include bis in the try header, so it won't be automatically closed. Option D only declares one resource, not both.
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.
✗
try (FileInputStream fis = new FileInputStream("a")) { BufferedInputStream bis = new BufferedInputStream(fis); ... }
Why it's wrong here
bis is not in the try header, so it is not automatically closed.
✓
try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... }
Why this is correct
Both resources are declared in order; fis is closed after bis as resources are closed in reverse order.
Related concept
Read the scenario before looking for a memorised answer.
✗
try (BufferedInputStream bis = new BufferedInputStream(fis); FileInputStream fis = new FileInputStream("a")) { ... }
Why it's wrong here
fis is used before declaration, causing a compilation error.
✗
try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream("a"))) { ... }
Why it's wrong here
Only one resource is declared, not both as required.
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.
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: try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... } — Option A is correct: Both resources are declared in the try header, with fis declared before bis. Option B has a forward reference error. Option C does not include bis in the try header, so it won't be automatically closed. Option D only declares one resource, not both.
What should I do if I get this 1Z0-829 question wrong?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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