oop lecture 3

Question 1

what is inheritance

Answer 1

Inheritance is a basic concept of object-oriented
programming
* Inheritance allows a class to have a parent class from
which it can inherit variables and methods

Question 2

example of inheritance in classes

Answer 2

• If a class B inherits from class A then it contains all the
  characteristics (information structure and behavior) of
  class A

Question 3

inheritance in classes

Answer 3

parent class= base class
child class=derived class

Question 4

advantages of inheritance

Answer 4

able to reuse
less redundancy
increase in maintainability

Question 5

class extension

Answer 5

members of a subclass can inherit variables and methods of their super-class

an have their own special instance variables
and methods that are not present in the super-class

Question 6

class extension example

Answer 6

public class employee EXTENDS person

employee is a subclass of person
person is a super class of employee

employee inherits from person

Question 7

inheritance and instance variables

Answer 7

An instance of a subclass stores all the instance
variables of the super-class (even private ones),
plus all the instance variables defined in the
subclass

private instance variables of
the super-class are NOT INHERITED

Question 8

access modifier