Drag a concept onto its matching description — or click a concept then click the description.
Concepts
Matches
Runtime exception (unchecked)
Checked exception
Runtime exception (unchecked)
Checked exception
Runtime exception (unchecked)
1Z0-811 Object-Oriented Programming Practice Question
Match each Java exception class to its category.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IOException: Checked Exception
Checked exceptions (e.g., IOException, ClassNotFoundException) must be handled or declared; unchecked exceptions (e.g., NullPointerException, ArithmeticException) are RuntimeExceptions and do not require explicit handling.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
IOException: Checked Exception
Why this is correct
IOException is a checked exception because it extends Exception (not RuntimeException) and must be handled or declared.
- ✓
NullPointerException: Unchecked Exception
Why this is correct
NullPointerException is an unchecked exception as it extends RuntimeException.
- ✓
ArithmeticException: Unchecked Exception
Why this is correct
ArithmeticException is a subclass of RuntimeException, making it an unchecked exception.
- ✓
ClassNotFoundException: Checked Exception
Why this is correct
ClassNotFoundException is a checked exception because it directly extends Exception.
- ✗
NullPointerException: Checked Exception
Why it's wrong here
Incorrect — NullPointerException is an unchecked (runtime) exception, not checked.
- ✗
IOException: Unchecked Exception
Why it's wrong here
Incorrect — IOException is a checked exception, not unchecked.
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