Java Assertions Quiz – 20 Questions with Answers
20 questions · 15 min · Medium
Exceptions in Java Quiz – 15 Questions with Answers
Test your knowledge of exception handling in Java with 15 questions covering exceptions, try-catch, finally, throw, throws, checked exceptions, unchecked exceptions, and custom exceptions.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. What is an exception in Java?
- A. A syntax rule
- B. An event that disrupts the normal flow of program execution
- C. A type of variable
- D. A Java package
Show answer
B. An event that disrupts the normal flow of program execution
An exception is an event that occurs during program execution and disrupts the normal flow of instructions.
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2. Which keywords are commonly used for exception handling in Java?
- A. try, catch, finally, throw, throws
- B. check, error, handle, catch
- C. try, error, handle, final
- D. exception, handle, catch, error
Show answer
A. try, catch, finally, throw, throws
Java provides try, catch, finally, throw, and throws as the main keywords for exception handling.
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3. Which block contains code that may throw an exception?
- A. catch
- B. finally
- C. try
- D. throw
Show answer
C. try
Code that may cause an exception is placed inside a try block so that it can be handled by an appropriate catch block.
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4. Which block is used to handle an exception in Java?
- A. try
- B. catch
- C. finally
- D. throws
Show answer
B. catch
A catch block contains code that handles an exception thrown from the associated try block.
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5. What is the purpose of the finally block?
- A. To define a new exception
- B. To execute cleanup code after try/catch processing
- C. To prevent all exceptions
- D. To declare checked exceptions
Show answer
B. To execute cleanup code after try/catch processing
The finally block is generally used for cleanup actions and normally executes after the try/catch processing, including when control leaves those blocks.
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6. Which keyword is used to explicitly throw an exception in Java?
- A. throws
- B. throw
- C. raise
- D. exception
Show answer
B. throw
The throw keyword is used to explicitly throw a particular exception object.
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7. What is the purpose of the throws keyword?
- A. To catch an exception
- B. To declare exceptions that a method may pass to its caller
- C. To create an exception object
- D. To terminate the JVM
Show answer
B. To declare exceptions that a method may pass to its caller
The throws clause in a method declaration indicates checked exceptions that the method may propagate to its caller.
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8. Which of the following is a checked exception in Java?
- A. NullPointerException
- B. ArithmeticException
- C. IOException
- D. ArrayIndexOutOfBoundsException
Show answer
C. IOException
IOException is a checked exception, so code generally must catch it or declare it with throws.
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9. Which class is the superclass of both Error and Exception?
- A. Throwable
- B. Object
- C. RuntimeException
- D. ExceptionHandler
Show answer
A. Throwable
java.lang.Throwable is the superclass of both Exception and Error in Java's throwable hierarchy.
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10. Which of the following is an unchecked exception?
- A. IOException
- B. SQLException
- C. ClassNotFoundException
- D. NullPointerException
Show answer
D. NullPointerException
NullPointerException extends RuntimeException, making it an unchecked exception.
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11. What happens if an exception is not caught in the current method?
- A. It is always ignored
- B. It propagates to the calling method
- C. The compiler automatically fixes it
- D. It is converted into a warning
Show answer
B. It propagates to the calling method
If an exception is not handled in the current method, it can propagate up the call stack to the caller.
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12. Can a Java program have multiple catch blocks for a single try block?
- A. Yes
- B. No
- C. Only for RuntimeException
- D. Only for Error
Show answer
A. Yes
A try block can be followed by multiple catch blocks to handle different exception types.
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13. What type of exception is typically used as the base class for creating a custom checked exception?
- A. Error
- B. Exception
- C. Object
- D. ThrowableError
Show answer
B. Exception
A custom checked exception can be created by extending Exception directly or another checked exception type.
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14. What is the result of executing the following statement? throw new IllegalArgumentException();
- A. It creates and throws an IllegalArgumentException
- B. It catches the exception automatically
- C. It declares a checked exception
- D. It permanently stops compilation
Show answer
A. It creates and throws an IllegalArgumentException
The new expression creates an IllegalArgumentException object and throw transfers control by throwing that exception.
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15. What is the main benefit of exception handling in Java?
- A. It eliminates all programming errors
- B. It separates exceptional error handling from normal program flow
- C. It guarantees faster execution
- D. It prevents methods from returning values
Show answer
B. It separates exceptional error handling from normal program flow
Exception handling provides a structured way to detect and handle exceptional conditions without mixing all error-handling logic into normal program flow.