Which keyword in Java is explicitly used inside a method body to throw a specific exception object?
Option C is correct. The 'throw' keyword is used to explicitly throw an exception object from any code block. 'throws' is used in method signatures to declare checked exceptions.
Which of the following is an Unchecked Exception in Java derived from java.lang.RuntimeException?
Option C is correct. NullPointerException inherits from RuntimeException, making it an Unchecked Exception (does not require mandatory try-catch or throws declaration at compile time).
What is the ultimate root superclass of all classes in the Java class hierarchy?
Option A is correct. Every class in Java directly or indirectly extends java.lang.Object, making it the root of the entire object hierarchy.
What effect does declaring a method as 'final' have in Java?
Option B is correct. Declaring a method 'final' prevents subclasses from overriding its implementation, enforcing immutability of the method behavior.
What happens if a class is declared with the 'final' keyword in Java?
Option A is correct. A 'final' class cannot be subclassed (inherited). Examples include java.lang.String and java.lang.Math.