Java Inheritance & Polymorphism Quiz

What is the purpose of inheritance in Java?

• To define multiple constructors

• To reuse existing code

• To create new data types

• To hide data from other classes

Which keyword is used for inheritance in Java?

• inherit

• extends

• override

• implements

Can a subclass constructor directly access a private member of its superclass?

• Yes, always

• No, private members are not accessible

• Only using super

• Only in the same package

What happens when both superclass and subclass have a field with same name?

• Superclass field is accessed through superclass reference

• Compilation error

• Java doesn't allow field hiding

• Subclass field hides superclass field

Can we override a method that throws an exception with one that doesn't?

• No

• Only if both throw same exception

• Only if exception is unchecked

• Yes

Which of these allows multiple inheritance?

• Abstract classes

• Interfaces

• Classes

• Constructors

Which of the following is an example of polymorphism?

• Method Overloading

• Declaring interfaces

• Using only static methods

• Declaring final variables

Which method is not polymorphic in nature?

• Overloaded method

• Overridden method

• Static method

• Abstract method

Why can't Java support multiple inheritance with classes?

• It's faster

• Java doesn't compile multiple classes

• Java is not object-oriented

• To avoid confusion from same method names

What happens if we do not explicitly call super() in a constructor?

• It throws exception

• Java automatically adds it

• Compilation error

• The parent class is skipped