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Exception Handling : MCQs & PYQs with Explanation

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Exception Handling : Solved MCQs and PYQs

This section contains carefully selected MCQs and Previous Year Questions with explanations to help students understand concepts and prepare effectively for examinations, interviews, and competitive tests.

Q: 1Which of these exceptions is thrown in cases when the file specified for writing is not found?

A

FileOutputException

B

FileException

C

FileNotFoundException

D

IOException

Option C

In Java, when a program attempts to open a file for reading or writing and that file does not exist or cannot be located in the specified path, Java throws a FileNotFoundException. This exception is a subclass of IOException and specifically indicates problems related to missing files.

Q: 2In the context of error handling in C++ and Java, which of the following is true about ‘finally’?

A

Finally block is mandatory

B

It will be executed only if exception occurs

C

It will be executed only if no exception occurs

D

It will be executed irrespective of exception occurrence

Option D

In Exception Handling (Java), the finally block is used to execute important code such as closing files or releasing resources. It is designed to run no matter what happens in the try block.
Whether an exception occurs or not, and even if it is handled or not, the finally block is always executed.

Q: 3Which of these classes are the direct subclasses of the Throwable Class?

A

Exception and VirtualMachineError Class

B

Error and Exception Class

C

IOException and VirtualMachineError Class

D

RuntimeException and Error Class

Option B

In Java, Throwable is the root class for all exceptions and errors that can occur during program execution. It defines the common behavior for objects that can be thrown using the throw keyword. It has two direct subclasses, Error and Exception.

exception-class-hierarchy

Note:

  • The RuntimeException and its sub-classes and Error and its sub-classes are Unchecked Exception. All other exceptions are Checked Exception.
  • The Throwable is the root class for Exception and its sub-classes and Error and its sub-classes.
  • The java.lang.Throwable class extends java.lang.Object class.
  • The Exception are due to programmatic logic and it is recoverable.
  • The Error are due to lack of system resources and it is non-recoverable.
  • The Throwable class provides a string variable that can be set by the subclasses to provide a detail message that provides more information of the exception occurred.
  • All classes of Throwable define a one-parameter constructor that takes a string as the detail message.
  • The class Throwable provides getMessage() method to retrieve an exception.

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