Day 4 - Inheritance, super, final, abstract, interface

What is inheritance in Java?

• Code duplication
• Multiple method calling
• Acquiring properties of one class into another
• Overloading methods

Which keyword is used to inherit a class in Java?

• import
• extends
• implements
• inherits

Which keyword is used to refer to the immediate parent class?

• this
• super
• base
• parent

What does the 'final' keyword mean when applied to a variable?

• It can be changed
• It cannot be changed
• It can be inherited
• It is temporary

Which class cannot be extended in Java?

• abstract class
• final class
• static class
• interface

What is an abstract class?

• A class with no name
• A class with only private members
• A class that cannot be instantiated
• A class that can only contain variables

What is an interface?

• A class with methods
• A blueprint of a class with abstract methods
• A final class
• An enum

Which keyword is used to define an abstract class?

• class
• interface
• final
• abstract

Which keyword prevents method overriding?

• static
• abstract
• final
• super

Can an abstract class have constructors?

• Yes
• No
• Only static
• Only private