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Exception handling is an important aspect of Java programming that allows you to handle and manage unexpected runtime errors. In this blog post, we present a Java Exception Handling Quiz comprising 10+ multiple-choice questions (MCQ). This quiz aims to assess your understanding of exception handling in Java, including the basics of exceptions, try-catch blocks, and exception propagation. Let's put your knowledge of Java exception handling to the test!.
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1. What is an exception in Java?
a) An error that occurs during compilation
b) An unexpected event that occurs during program execution
c) A logical error in the code
d) A warning issued by the compiler
Answer:
b) An unexpected event that occurs during program execution
Explanation:
An exception in Java is an unexpected event that occurs during the execution of a program, disrupting its normal flow.
2. Which class is the superclass of all exceptions in Java?
a) Error
b) RuntimeException
c) Throwable
d) Exception
Answer:
c) Throwable
Explanation:
The Throwable class is the superclass of all exceptions and errors in Java. It is the root class from which all exception classes are derived.
3. Which type of exception is checked at compile-time?
a) RuntimeException
b) Checked Exception
c) Unchecked Exception
d) Error
Answer:
b) Checked Exception
Explanation:
Checked exceptions are exceptions that are checked at compile-time. The compiler ensures that these exceptions are either caught or declared in the method signature.
4. Which keyword is used to handle exceptions in Java?
a) handle
b) try
c) catch
d) throws
Answer:
b) try
Explanation:
The try keyword is used to handle exceptions in Java. It allows you to define a block of code that will be tested for exceptions.
5. Which block must follow a try block?
a) final
b) catch
c) done
d) except
Answer:
b) catch
Explanation:
A catch block must follow a try block. It is used to handle the exception that occurs in the try block.
6. What does the finally block do in exception handling?
a) Catches the exception
b) Executes only if an exception is thrown
c) Executes code after the try-catch block, regardless of an exception
d) Returns the exception to the caller
Answer:
c) Executes code after the try-catch block, regardless of an exception
Explanation:
The finally block is used to execute important code such as closing resources. It is executed after the try-catch block, whether an exception is thrown or not.
7. Which keyword is used to throw an exception explicitly in Java?
a) throw
b) throws
c) try
d) catch
Answer:
a) throw
Explanation:
The throw keyword is used to explicitly throw an exception in Java.
8. Which keyword is used to declare an exception in the method signature?
a) throw
b) throws
c) try
d) catch
Answer:
b) throws
Explanation:
The throws keyword is used in the method signature to declare that a method can throw exceptions.
9. What type of exception is thrown when a null reference is accessed?
a) NullPointerException
b) IllegalArgumentException
c) ArrayIndexOutOfBoundsException
d) ClassCastException
Answer:
a) NullPointerException
Explanation:
A NullPointerException is thrown when an application attempts to use an object reference that has the null value.
10. Which of the following is an unchecked exception in Java?
a) IOException
b) SQLException
c) NullPointerException
d) FileNotFoundException
Answer:
c) NullPointerException
Explanation:
NullPointerException is an unchecked exception in Java. It occurs during runtime and does not need to be declared in a method's throws clause.
11. Which exception is thrown when an array is accessed with an illegal index?
a) ArrayIndexOutOfBoundsException
b) ClassCastException
c) NullPointerException
d) ArithmeticException
Answer:
a) ArrayIndexOutOfBoundsException
Explanation:
An ArrayIndexOutOfBoundsException is thrown when an array is accessed with an illegal index that is either negative or greater than the size of the array.
12. Which exception is thrown when an arithmetic operation is attempted to divide by zero?
a) ArithmeticException
b) NumberFormatException
c) ClassCastException
d) NullPointerException
Answer:
a) ArithmeticException
Explanation:
An ArithmeticException is thrown when an arithmetic operation is attempted, such as division by zero.
13. Which exception is thrown when an attempt is made to cast an object to a subclass of which it is not an instance?
a) ClassCastException
b) IllegalArgumentException
c) NumberFormatException
d) ArrayStoreException
Answer:
a) ClassCastException
Explanation:
A ClassCastException is thrown when an attempt is made to cast an object to a subclass of which it is not an instance.
14. Which exception is thrown by the JVM when it encounters an abnormal condition?
a) Throwable
b) Exception
c) Error
d) RuntimeException
Answer:
c) Error
Explanation:
An Error is thrown by the JVM when it encounters an abnormal condition that it cannot recover from, such as OutOfMemoryError.
15. Which of the following is a checked exception in Java?
a) IOException
b) ArrayIndexOutOfBoundsException
c) ClassCastException
d) NullPointerException
Answer:
a) IOException
Explanation:
IOException is a checked exception in Java. It must be caught or declared to be thrown in the method signature.
16. Which keyword is used to create a custom exception in Java?
a) extends
b) implements
c) throws
d) super
Answer:
a) extends
Explanation:
To create a custom exception in Java, you need to create a class that extends the Exception class or its subclasses.
17. What happens if an exception is not handled in a program?
a) The program runs normally
b) The program prints an error and continues
c) The program terminates abnormally
d) The program ignores the exception
Answer:
c) The program terminates abnormally
Explanation:
If an exception is not handled in a program, it propagates up the call stack, and if not handled, it causes the program to terminate abnormally.
18. Which exception is thrown when a string cannot be converted to a numeric type?
a) NumberFormatException
b) ClassCastException
c) IllegalArgumentException
d) ArrayIndexOutOfBoundsException
Answer:
a) NumberFormatException
Explanation:
A NumberFormatException is thrown when an attempt is made to convert a string to a numeric type but the string does not have the appropriate format.
19. Which of the following exceptions is thrown when a file is not found?
a) FileNotFoundException
b) IOException
c) NullPointerException
d) ClassCastException
Answer:
a) FileNotFoundException
Explanation:
A FileNotFoundException is thrown when an attempt to open the file denoted by a specified pathname has failed.
20. Which of the following is used to group multiple exceptions in a single catch block?
a) Using the | operator
b) Using the & operator
c) Using the && operator
d) Using the || operator
Answer:
a) Using the | operator
Explanation:
Java allows multiple exceptions to be caught in a single catch block by separating them with the | operator.
21. Which of the following exceptions is thrown when an application attempts to use a method that is not supported by that object?
a) UnsupportedOperationException
b) ClassCastException
c) NullPointerException
d) ArrayIndexOutOfBoundsException
Answer:
a) UnsupportedOperationException
Explanation:
An UnsupportedOperationException is thrown when an application attempts to use a method that is not supported by that object.
22. Which of the following is true about the finally block?
a) It is executed only if an exception is thrown
b) It is executed only if an exception is not thrown
c) It is executed whether an exception is thrown or not
d) It is never executed
Answer:
c) It is executed whether an exception is thrown or not
Explanation:
The finally block is executed whether an exception is thrown or not, ensuring that essential code is always executed, such as closing resources.
23. Which exception is thrown by the JVM when the JVM runs out of memory?
a) OutOfMemoryError
b) StackOverflowError
c) ArithmeticException
d) IOException
Answer:
a) OutOfMemoryError
Explanation:
An OutOfMemoryError is thrown when the JVM cannot allocate an object because it is out of memory and the garbage collector cannot make any space available.
24. Which exception is thrown when there is an attempt to access a class that does not exist?
a) ClassNotFoundException
b) NoClassDefFoundError
c) ClassCastException
d) FileNotFoundException
Answer:
a) ClassNotFoundException
Explanation:
A ClassNotFoundException is thrown when an application tries to load a class through its string name but cannot find the definition for the class.
25. Which exception is thrown when an input-output operation fails or is interrupted?
a) IOException
b) SQLException
c) NullPointerException
d) FileNotFoundException
Answer:
a) IOException
Explanation:
An IOException is thrown when an input-output operation fails or is interrupted, such as when trying to read from a file that does not exist.
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