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. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 writing a utility to copy a large binary file (e.g., 500 MB) from one location to another while minimizing memory overhead and ensuring data integrity. Which approach is most appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a custom loop reading into a byte array of 8KB and writing to the output stream.
Option B is correct because reading and writing in fixed-size chunks (e.g., 8KB) minimizes memory overhead by avoiding loading the entire 500 MB file into memory, while still providing efficient I/O through buffered operations. This approach ensures data integrity by processing the file sequentially without relying on character-based streams, which are unsuitable for binary data.
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 BufferedReader and BufferedWriter for binary data.
Why it's wrong here
Character streams are unsuitable for binary data.
✓
Use a custom loop reading into a byte array of 8KB and writing to the output stream.
Why this is correct
Processes data in small chunks, keeping memory usage low.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Files.copy() with StandardCopyOption.REPLACE_EXISTING.
Why it's wrong here
Files.copy() is efficient but may not be as memory-optimized as a custom loop; also it's not the most customizable.
✗
Use FileInputStream.readAllBytes() and FileOutputStream.write().
Why it's wrong here
Loads the entire file into memory, causing high memory usage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Files.copy() (Option C) because it is convenient and commonly used, but the question explicitly requires minimizing memory overhead, and Files.copy() does not expose buffer size control, making the custom loop (Option B) the more precise answer for this specific constraint.
Detailed technical explanation
How to think about this question
Under the hood, the 8KB buffer size is a common default in Java's BufferedInputStream because it balances memory usage and system call overhead; larger buffers (e.g., 64KB) may improve throughput on fast storage but increase memory footprint. In real-world scenarios, using a custom loop with a byte array allows the developer to implement progress reporting or checksum verification (e.g., SHA-256) during the copy, which is not possible with Files.copy() without additional passes.
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.
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 a custom loop reading into a byte array of 8KB and writing to the output stream. — Option B is correct because reading and writing in fixed-size chunks (e.g., 8KB) minimizes memory overhead by avoiding loading the entire 500 MB file into memory, while still providing efficient I/O through buffered operations. This approach ensures data integrity by processing the file sequentially without relying on character-based streams, which are unsuitable for binary data.
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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Question Discussion
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