This 1Z0-811 practice question tests your understanding of exception handling and development tools. 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 of the following exceptions is a checked exception?
ArrayIndexOutOfBoundsException
Why wrong: ArrayIndexOutOfBoundsException is an unchecked exception.
ArithmeticException
Why wrong: ArithmeticException is an unchecked exception (RuntimeException subclass).
IOException
IOException is a checked exception.
NullPointerException
Why wrong: NullPointerException is an unchecked exception.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
IOException
Option C is correct because IOException is a checked exception in Java, meaning it must be either caught or declared in the method signature using a try-catch block or throws clause. Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses), and IOException directly extends Exception, making it subject to compile-time checking.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ArrayIndexOutOfBoundsException
Why it's wrong here
ArrayIndexOutOfBoundsException is an unchecked exception.
ArithmeticException
Why it's wrong here
ArithmeticException is an unchecked exception (RuntimeException subclass).
IOException
Why this is correct
IOException is a checked exception.
Related concept
Read the scenario before looking for a memorised answer.
NullPointerException
Why it's wrong here
NullPointerException is an unchecked exception.
Common exam traps
Oracle often tests the distinction between checked and unchecked exceptions by listing common RuntimeException subclasses (like NullPointerException, ArrayIndexOutOfBoundsException, ArithmeticException) as distractors, hoping candidates confuse them with checked exceptions due to their frequent occurrence in code.
Detailed technical explanation
In Java, the exception hierarchy is rooted in Throwable, with Exception and Error as direct subclasses. Checked exceptions (like IOException) are designed for recoverable conditions that a well-written application should anticipate, such as file not found or network failures. The compiler enforces handling at compile time to ensure robustness, whereas unchecked exceptions (RuntimeException subclasses) typically indicate programming bugs like logic errors or invalid array indices, which are not forced to be caught.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Exception Handling and Development Tools — This question tests Exception Handling and Development Tools — Read the scenario before looking for a memorised answer..
The correct answer is: IOException — Option C is correct because IOException is a checked exception in Java, meaning it must be either caught or declared in the method signature using a try-catch block or throws clause. Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses), and IOException directly extends Exception, making it subject to compile-time checking.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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