Java Exception Interview Questions
Top Java Exception Interview Questions
Java Exception Interview Questions
Java exception interview questions often revolve around the candidate's understanding of how exceptions work in Java, including types of exceptions, handling mechanisms such as try-catch blocks and throws clause, best practices for exception handling, and the difference between checked and unchecked exceptions. Interviewers may also ask about how to create custom exceptions, the concept of exception propagation, and how to deal with common exceptions like NullPointerException and ArrayIndexOutOfBoundsException. Candidates may be asked to write code snippets demonstrating their knowledge of exception handling in Java and how to effectively handle different types of exceptions in various scenarios.
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1 - What is an Exception in Java?
An exception in Java is an event that disrupts the normal flow of a program's execution. It is typically caused by errors or unexpected conditions that occur during runtime. Exceptions are objects that represent different types of errors, such as divide by zero, null pointer, and array out of bounds.
2) What is the difference between checked and unchecked exceptions?
Checked exceptions are checked at compile time, which means that the compiler forces the programmer to handle or declare them using a try catch block. Unchecked exceptions, on the other hand, do not have this requirement and can occur at runtime without being explicitly caught.
3) How do you handle exceptions in Java?
Exceptions can be handled using try catch blocks. The code that might throw an exception is enclosed within the try block, and the catch block is used to catch and handle the exception if it occurs. Additionally, the finally block can be used to execute code that should run regardless of whether an exception is thrown.
4) What is the purpose of the finally block in exception handling?
The finally block is used to execute code that should always run, regardless of whether an exception is thrown or not. This block is commonly used to release resources such as closing files or database connections that were opened in the try block.
5) What is the difference between throw and throws in Java?
The throw keyword is used to explicitly throw an exception within a method. On the other hand, the throws keyword is used in the method signature to indicate that the method may throw a particular type of exception, and the caller of the method should handle it appropriately.
6) Can we rethrow an exception in Java?
Yes, it is possible to rethrow an exception in Java by catching it in one catch block and throwing it again using the throw statement. This can be useful for handling exceptions at a higher level in the application.
7) What is the difference between error and exception in Java?
Errors are typically caused by the environment in which the application is running, such as running out of memory, whereas exceptions are issues that can be handled within the application's code. Errors are not meant to be caught or handled by the application code.
8) Can we create a custom exception in Java?
Yes, custom exceptions can be created by extending the Exception class or one of its subclasses. By creating custom exceptions, developers can define their own exception types to handle specific scenarios in their applications.
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