1Z0-811 Exception Handling and Development Tools Practice Question
Which THREE of the following are checked exceptions in Java?
⚠ Common exam trap
Candidates often confuse runtime exceptions (like `NullPointerException` and `ArithmeticException`) with checked exceptions, because all are subclasses of `Throwable`, but only those that are not subclasses of `RuntimeException` or `Error` are checked.
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
✓
java.sql.SQLException
`java.sql.SQLException` is a checked exception in Java, meaning it must be either caught or declared in the method signature using `throws`. Checked exceptions are subclasses of `Exception` but not of `RuntimeException`, and `SQLException` directly extends `java.lang.Exception`, making it a checked exception that the compiler enforces handling for.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
java.sql.SQLException
Why this is correct
SQLException is a checked exception from JDBC operations.
- ✗
java.lang.NullPointerException
Why it's wrong here
NullPointerException is a runtime exception (unchecked).
- ✓
java.lang.ClassNotFoundException
Why this is correct
ClassNotFoundException occurs when trying to load a class dynamically and is checked.
- ✗
java.lang.ArithmeticException
Why it's wrong here
ArithmeticException is a runtime exception (unchecked).
- ✓
java.io.IOException
Why this is correct
IOException is a checked exception; must be handled or declared.
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