This 1Z0-829 practice question tests your understanding of handling exceptions. 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 is a checked exception in Java?
NullPointerException
Why wrong: Unchecked runtime exception.
ArithmeticException
Why wrong: Unchecked runtime exception.
IOException
Checked exception, must be handled or declared.
IllegalArgumentException
Why wrong: Unchecked runtime 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. Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses), and the compiler enforces that they are either caught or declared in the method's throws clause. IOException directly extends Exception, making it a checked exception that must be handled at compile time.
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.
NullPointerException
Why it's wrong here
Unchecked runtime exception.
ArithmeticException
Why it's wrong here
Unchecked runtime exception.
IOException
Why this is correct
Checked exception, must be handled or declared.
Related concept
Read the scenario before looking for a memorised answer.
IllegalArgumentException
Why it's wrong here
Unchecked runtime exception.
Common exam traps
The trap here is that candidates often confuse any exception that occurs at runtime with a 'checked exception', forgetting that only subclasses of Exception that are not subclasses of RuntimeException are checked, so they incorrectly select NullPointerException or ArithmeticException.
Detailed technical explanation
Under the hood, Java's 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. A common subtlety is that RuntimeException and its subclasses are unchecked, meaning they represent programming errors (e.g., null pointer, illegal argument) that could have been avoided with proper coding, and the compiler does not enforce handling.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Handling Exceptions — This question tests Handling Exceptions — 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. Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses), and the compiler enforces that they are either caught or declared in the method's throws clause. IOException directly extends Exception, making it a checked exception that must be handled at compile time.
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 25, 2026
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