The correct choice is `Files.readAllLines(Path.of("data.txt"), StandardCharsets.UTF_8)`, as this NIO.2 method reads all lines from a file into a `List<String>` while explicitly specifying the character encoding. This is essential because `Files.readAllLines()` requires a `Charset` parameter to correctly interpret the file's bytes; omitting it defaults to UTF-8 only in newer Java versions, but for the 1Z0-829 exam, you must always provide `StandardCharsets.UTF_8` when UTF-8 encoding is stated. The method returns a complete list of lines, making it ideal for small to medium files where you need the entire content in memory at once. On the Oracle Certified Professional Java SE 17 Developer exam, this question tests your ability to distinguish NIO.2 file-reading methods from legacy I/O (like `BufferedReader`) and to remember that `Files.readAllLines` throws `IOException` and accepts a `Path` object, not a `String` file path. A common trap is confusing it with `Files.lines()`, which returns a `Stream` that must be closed. Memory tip: think "All Lines, All Chars" — `readAllLines` needs both a Path and a Charset to work correctly.
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.
A developer needs to read all lines from a text file named "data.txt" that uses UTF-8 encoding. Which code correctly reads the file using the NIO.2 API?
Option D is correct because `Files.readAllLines()` reads all lines from a file into a `List<String>`, and it accepts a `Path` and a `Charset` (here `StandardCharsets.UTF_8`) to handle encoding. This method is part of the NIO.2 API and directly fulfills the requirement to read all lines from a UTF-8 encoded file.
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.
Files.readAllLines directly returns a List<String> with the specified charset, which is the simplest correct approach.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `Files.readString()` (which returns a single string) with `Files.readAllLines()` (which returns a list of lines), or they mistakenly think `Files.readAllBytes().toString()` will convert bytes to text, when in fact it returns the object reference string.
Detailed technical explanation
How to think about this question
Under the hood, `Files.readAllLines()` uses a `BufferedReader` internally to read the file line by line, decoding bytes using the specified `Charset` (UTF-8). This method loads the entire file into memory, making it suitable for small to medium files; for large files, `Files.lines()` (which returns a `Stream`) is preferred to process lines lazily without holding all lines in memory at once.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Files.readAllLines(Path.of("data.txt"), StandardCharsets.UTF_8) — Option D is correct because `Files.readAllLines()` reads all lines from a file into a `List<String>`, and it accepts a `Path` and a `Charset` (here `StandardCharsets.UTF_8`) to handle encoding. This method is part of the NIO.2 API and directly fulfills the requirement to read all lines from a UTF-8 encoded file.
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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