Java Exception Handling preguntas y respuestas de entrevista

Pregunta 11. Explain the difference between 'throw' and 'throws' in Java.

'throw' is used to explicitly throw an exception, while 'throws' is used in method signature to declare that the method may throw one or more types of exceptions.

Pregunta 12. What is the purpose of the 'NullPointerException' in Java?

The 'NullPointerException' is thrown when attempting to access or modify an object reference that is null.

Example:

String str = null;
int length = str.length(); // This will throw NullPointerException

Pregunta 13. How can you create a custom exception in Java?

To create a custom exception, you need to extend the 'Exception' class or one of its subclasses.

Example:

class CustomException extends Exception { /* constructor and additional code */ }

Pregunta 14. What is the purpose of the 'try' block?

The 'try' block is used to enclose a block of code where exceptions might occur.

Example:

try { /* code that may throw exceptions */ } catch (Exception e) { /* handle exception */ }

Pregunta 15. Can you have multiple 'finally' blocks in a try-catch-finally statement?

No, there can be at most one 'finally' block associated with a 'try-catch' statement.