- A
try (FileInputStream fis = new FileInputStream("a")) { BufferedInputStream bis = new BufferedInputStream(fis); ... }
Why wrong: bis is not in the try header, so it is not automatically closed.
- B
try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... }
Both resources are declared in order; fis is closed after bis as resources are closed in reverse order.
- C
try (BufferedInputStream bis = new BufferedInputStream(fis); FileInputStream fis = new FileInputStream("a")) { ... }
Why wrong: fis is used before declaration, causing a compilation error.
- D
try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream("a"))) { ... }
Why wrong: Only one resource is declared, not both as required.
Question 184 of 519
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 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
✓
try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... }
Option B is correct because in a try-with-resources statement, resources are declared in order and closed in reverse order. By declaring FileInputStream first and then BufferedInputStream wrapping it, both resources are properly closed automatically, with the BufferedInputStream closed first (ensuring its buffer is flushed) and then the FileInputStream.
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
Oracle often tests the misconception that resources declared inside the try block (not in the resource list) are automatically closed, or that the order of declaration in try-with-resources does not matter for wrapping streams.
Detailed technical explanation
How to think about this question
Under the hood, try-with-resources uses a synthetic finally block that calls close() on each resource in reverse declaration order. For BufferedInputStream wrapping a FileInputStream, closing the BufferedInputStream automatically calls close() on the underlying FileInputStream, so explicit declaration of both is safe and ensures proper resource management. In real-world scenarios, this pattern is essential when you need to access the underlying stream's methods (e.g., FileInputStream.getChannel()) after the wrapper is used.
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: try (FileInputStream fis = new FileInputStream("a"); BufferedInputStream bis = new BufferedInputStream(fis)) { ... } — Option B is correct because in a try-with-resources statement, resources are declared in order and closed in reverse order. By declaring FileInputStream first and then BufferedInputStream wrapping it, both resources are properly closed automatically, with the BufferedInputStream closed first (ensuring its buffer is flushed) and then the FileInputStream.
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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