The correct answer is that FileInputStream implements java.io.Closeable. This is true because FileInputStream directly extends java.io.InputStream, and the InputStream class itself implements the Closeable interface, which extends AutoCloseable. This inheritance chain means FileInputStream inherits the close() method and can be used in try-with-resources statements for automatic resource management, a key concept tested on the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam. The exam often presents a trap where candidates confuse "extends" with "implements"—FileInputStream extends InputStream but implements Closeable through that inheritance, not directly. A common memory tip is to remember that all I/O stream classes that deal with system resources (files, sockets) ultimately implement Closeable, so if you see a stream class, assume it is closeable unless it is explicitly a wrapper like ByteArrayInputStream. Think "CIA": Closeable, InputStream, AutoCloseable—FileInputStream hits all three through its class hierarchy.
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 two statements are true about FileInputStream? (Select two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It extends java.io.InputStream.
Option B is correct because FileInputStream directly extends java.io.InputStream, inheriting its abstract methods for reading bytes from a file. Option C is correct because FileInputStream implements java.io.Closeable, which extends AutoCloseable, allowing it to be used in try-with-resources statements for automatic resource management.
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.
✗
It supports mark() and reset().
Why it's wrong here
FileInputStream does not support mark/reset unless wrapped in a BufferedInputStream.
✓
It extends java.io.InputStream.
Why this is correct
FileInputStream is a subclass of InputStream.
Related concept
Read the scenario before looking for a memorised answer.
✓
It implements java.io.Closeable.
Why this is correct
FileInputStream implements Closeable due to inheritance from InputStream.
Related concept
Read the scenario before looking for a memorised answer.
✗
It reads data in big-endian order.
Why it's wrong here
Endianness is not a property of FileInputStream.
✗
It can be used to read characters.
Why it's wrong here
FileInputStream reads raw bytes; character reading requires Reader wrappers.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse FileInputStream with BufferedInputStream or DataInputStream, assuming it supports mark/reset or reads data in a specific byte order, when in fact it is a simple unbuffered byte stream with no such capabilities.
Detailed technical explanation
How to think about this question
Under the hood, FileInputStream uses native methods to read bytes from a file descriptor, and its read() method returns an int in the range 0-255 or -1 for end-of-file. A common subtlety is that FileInputStream does not buffer data internally, so repeated single-byte reads can be extremely slow; wrapping it with BufferedInputStream improves performance. In real-world scenarios, FileInputStream is often used for binary file processing (e.g., images, audio) where byte-level access is required, while character data requires explicit encoding handling.
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: It extends java.io.InputStream. — Option B is correct because FileInputStream directly extends java.io.InputStream, inheriting its abstract methods for reading bytes from a file. Option C is correct because FileInputStream implements java.io.Closeable, which extends AutoCloseable, allowing it to be used in try-with-resources statements for automatic resource management.
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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