Java MCQs – Exception Handling

Exception handling is a critical aspect of Java programming, ensuring that applications can gracefully respond to unexpected situations. This article presents a set of Multiple Choice Questions (MCQs) focused on Java’s exception-handling mechanisms. Exception handling is not just about catching errors; it’s about gracefully managing unexpected events while maintaining the stability and reliability of your code.

These MCQs cover a wide range of topics, from the fundamental concepts of try-catch blocks to handling custom exceptions and understanding the differences between checked and unchecked exceptions. Whether you’re a beginner looking to solidify your understanding or an experienced developer preparing for interviews, these Java MCQs on exception handling will enhance your knowledge and problem-solving skills in the realm of error management in Java.

1.) What is an exception in Java?

A) A syntax error
B) An unexpected event or error during program execution
C) A comment in the code
D) A variable declaration

Answer: Option B

Explanation: An exception in Java is an unexpected event or error that occurs during program execution.

2.) In Java, can you have a “catch” block without a corresponding “try” block?

A) Yes, it’s allowed and useful for handling specific exceptions.
B) No, a “catch” block must always be associated with a “try” block.
C) Yes, but only in Java 8 and later versions.
D) No, it’s a compile-time error.

Answer: Option D

Explanation: A “catch” block must always be associated with a “try” block.

3.) What is the purpose of the “catch” block in Java exception handling?

A) To throw exceptions
B) To specify the code that may throw an exception
C) To handle and process exceptions
D) To terminate the program

Answer: Option C

Explanation: The “catch” block is used to handle and process exceptions that occur in the associated “try” block.

4.) Which keyword is used to explicitly throw an exception in Java?

A) try
B) catch
C) throw
D) finally

Answer: Option C

Explanation: The “throw” keyword is used to explicitly throw an exception in Java.

5.) What is the purpose of the “finally” block in Java exception handling?

A) To throw exceptions
B) To specify the code that may throw an exception
C) To handle and process exceptions
D) To ensure that certain code is always executed, whether an exception is thrown or not

Answer: Option D

Explanation: The “finally” block is used to ensure that certain code is always executed, whether an exception is thrown or not.

6.) Which of the following statements is true regarding checked exceptions in Java?

A) Checked exceptions are not required to be caught or declared.
B) Checked exceptions must be caught or declared in a method’s throws clause.
C) Checked exceptions are always runtime exceptions.
D) Checked exceptions are handled automatically by the Java runtime.

Answer: Option B

Explanation: Checked exceptions must be caught or declared in a method’s throws clause.

7.) In Java, which exception class should be used when creating custom checked exceptions?

A) Exception
B) RuntimeException
C) Error
D) Throwable

Answer: Option A

Explanation: Custom checked exceptions should extend the “Exception” class in Java.

8.) What is the root class for all Java exceptions?

A) Object
B) Exception
C) Throwable
D) RuntimeException

Answer: Option C

Explanation: The root class for all Java exceptions is “Throwable.”

9.) Which exception is thrown when an array index is out of bounds?

A) ArrayIndexOutOfBoundsException
B) IndexOutOfBoundsException
C) ArrayOutOfBoundsException
D) OutOfBoundsException

Answer: Option A

Explanation: The “ArrayIndexOutOfBoundsException” is thrown when an array index is out of bounds.

10.) What is the purpose of the “throws” keyword in a method signature?

A) To indicate that the method may throw exceptions
B) To catch exceptions in the method
C) To define a custom exception
D) To terminate the program

Answer: Option A

Explanation: The “throws” keyword is used in a method signature to indicate that the method may throw exceptions.

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