Exception Handling and Assertions Flashcards

Which of the following exceptions is a checked exception?

Answer: FileNotFoundException

FileNotFoundException extends IOException which extends Exception (not RuntimeException), making it a checked exception.

What is the correct way to re-throw the current exception inside a catch block without losing the stack trace?

Answer: throw e;

Using `throw e;` re-throws the original exception object, preserving the original stack trace.

What does the `throws` clause in a method declaration indicate?

Answer: The method may throw that checked exception and callers must handle it

The throws clause declares that a method may propagate checked exceptions, requiring callers to catch or declare them.

Can a subclass method declare more checked exceptions in its throws clause than the overridden parent method?

Answer: No, it can only declare the same or fewer checked exceptions

An overriding method cannot throw new or broader checked exceptions than those declared by the overridden method.

What is printed by: `try { System.exit(0); } finally { System.out.print("finally"); }`?

Answer: Nothing

System.exit() terminates the JVM immediately, so the finally block never executes.

Which JVM flag enables assertions for a specific class named `com.example.MyClass`?

Answer: Both A and B are correct

Both -ea and -enableassertions are equivalent flags and can be used with a class name to enable assertions for that specific class.

What is the purpose of exception chaining introduced in Java 1.4?

Answer: To preserve the original cause when wrapping exceptions

Exception chaining allows you to wrap a low-level exception in a higher-level one while preserving the original cause via initCause() or constructor.