When a subclass constructor calls its superclass constructor, what happens if the superclass's constructor does not assign a value to an instance variable?
A) A syntax error occurs.
B) A compile-time error occurs.
C) A run-time error occurs.
D) The program compiles and runs because the instance variables are initialized to their default values.

Question

Quizplus · Accepted Answer

When a subclass constructor calls its superclass constructor, the superclass constructor is responsible for initializing the inherited instance variables. If the superclass constructor does not assign a value to an instance variable, the variable will still be initialized to its default value (e.g. 0 for int, null for Object). Therefore, the program will compile and run without error.

When a Subclass Constructor Calls Its Superclass Constructor, What Happens