SAS Programming Quiz

In most programming languages like Java, methods with the same name and same argument list must have the same return type. Different return types alone do not constitute valid overloading or overriding - this creates ambiguity and is not allowed.

In languages like Java, local variables must be explicitly initialized before use. Unlike instance variables which get default values, local variables do not receive any default value and contain garbage until initialized.

Instance variables are not overridden - they are hidden. When a subclass declares a variable with the same name, it shadows the parent's variable rather than overriding it. Only methods are truly overridden in polymorphism.

You can declare a reference variable of an abstract class type. While you cannot instantiate an abstract class directly using new, the reference can point to instances of any concrete subclasses.

In Java, every class implicitly extends java.lang.Object. Therefore, the superclass of Class is Object. The option text 'Class object' refers to the Object class, which is the root of the class hierarchy.