The answer is `Files.readString()`, introduced in Java 11, which reads a text file’s contents into a `String` in a single, clean call while automatically handling charset encoding and resource closure. This method is the most direct and efficient approach because it eliminates boilerplate code like buffered readers or manual loops, making it a favorite for the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam. When you need to read file to string Java, the exam tests your ability to distinguish `Files.readString()` from older alternatives like `Files.lines()` combined with `Collectors.joining()`, or `Scanner` with `useDelimiter("\\Z")`. A common trap is forgetting that `Files.readString()` requires a `Path` object, not a `String` file name, and that it throws `IOException`. For the exam, remember the mnemonic “ReadString is the One-Stop String” — it’s the simplest, safest, and most modern choice for loading a file’s text directly into memory.
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 THREE are valid ways to read the contents of a text file into a String in Java?
Option A is correct because `Files.readString()` (introduced in Java 11) reads the entire content of a text file into a `String` in one call, handling charset encoding (default UTF-8) and closing the file automatically. It is the simplest and most direct method for this task.
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.lines() returns a stream of lines, then joining combines them.
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 may confuse `Files.readAllLines()` (which returns a `List`) with `Files.readString()` (which returns a `String`), or assume `FileReader` has a `readString()` method when it does not.
Detailed technical explanation
How to think about this question
Under the hood, `Files.readString()` uses a `BufferedReader` with a `CharBuffer` to efficiently read the file content into a single `String`, and it respects the file's charset (default UTF-8). The `Scanner` approach in option D uses the delimiter `\Z` (end of input boundary) to read the entire file as a single token, which works but is less efficient and more verbose. The `Files.lines()` method in option E returns a `Stream<String>` that must be collected and joined, which is suitable for large files due to lazy streaming but requires explicit handling of line separators.
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: String content = Files.readString(Path.of("file.txt")); — Option A is correct because `Files.readString()` (introduced in Java 11) reads the entire content of a text file into a `String` in one call, handling charset encoding (default UTF-8) and closing the file automatically. It is the simplest and most direct method for this task.
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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