The correct approach is `File.createTempFile("pre", ".txt").deleteOnExit()`, because `createTempFile` generates a uniquely named temporary file in the default temporary directory, and chaining `deleteOnExit()` registers that file for automatic deletion when the JVM terminates. This two-step mechanism ensures the file is both created and scheduled for cleanup without manual intervention, directly fulfilling the requirement for auto-cleaned temporary files. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of the `java.io.File` class and its lifecycle methods, often appearing as a trap where candidates confuse `deleteOnExit()` with immediate deletion or forget that `createTempFile` alone does not clean up. A common pitfall is assuming `Files.createTempFile()` from NIO.2 also has a built-in auto-delete feature—it does not; you must explicitly call `deleteOnExit()` on the `File` object. Memory tip: think “create then schedule” — the file is born, then booked for the exit.
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 create a temporary file that will be automatically deleted when the JVM terminates. Which approach correctly achieves this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
File.createTempFile("pre", ".txt").deleteOnExit()
Option A is correct because `File.createTempFile("pre", ".txt")` creates a temporary file in the default temporary-file directory, and chaining `.deleteOnExit()` registers that file for deletion when the JVM terminates. This combination ensures both the creation of a temporary file and its automatic cleanup upon JVM shutdown, fulfilling the requirement precisely.
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.
✓
File.createTempFile("pre", ".txt").deleteOnExit()
Why this is correct
Creates a temp file and registers it for automatic deletion on JVM exit.
Related concept
Read the scenario before looking for a memorised answer.
✗
new File("tmp.txt").deleteOnExit()
Why it's wrong here
Does not create a temporary file; only registers an existing file for deletion.
Creates a temp file but does not register for deletion.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse creating a temporary file with simply scheduling deletion of any file, or they forget that `Files.createTempFile()` alone does not register for automatic deletion, leading them to pick option D without the necessary `.deleteOnExit()` call.
Detailed technical explanation
How to think about this question
Under the hood, `File.deleteOnExit()` registers the file path in a static `DeleteOnExitHook` that runs during JVM shutdown via `Runtime.addShutdownHook()`. This hook deletes files in reverse order of registration, but it does not guarantee deletion if the JVM crashes or is killed forcefully (e.g., SIGKILL). For more robust cleanup, consider using `Files.createTempFile()` with `DELETE_ON_CLOSE` or try-with-resources, but `deleteOnExit()` is the standard approach for JVM-termination-based cleanup.
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: File.createTempFile("pre", ".txt").deleteOnExit() — Option A is correct because `File.createTempFile("pre", ".txt")` creates a temporary file in the default temporary-file directory, and chaining `.deleteOnExit()` registers that file for deletion when the JVM terminates. This combination ensures both the creation of a temporary file and its automatic cleanup upon JVM shutdown, fulfilling the requirement precisely.
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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