Introduction (class inheritance)

Question 1

Define Inheritance

Answer 1

Inheritance is the process by which the child class includes automatically public and protected members defined in the parent class

Question 2

Define Multiple Inheritance !

Answer 2

Multiple inheritance refers to the ability of one class to inherit from more than one direct super class and it is not supported in java

Question 3

Define Single Inheritance !

Answer 3

Single Inheritance refers to the ability of a class to inherit from only one super class. This means that a child class can at most have one direct parent

Question 4

Give one exception to the single inheritance rule !

Answer 4

Multiple inheritance is allowed for interfaces in java where a class can implement multiple interfaces and an interface can extend multiple interfaces

Question 5

How to prevent a class from being extended ?

Answer 5

We can prevent a class from being extended by marking it as final

Question 6

Give a characteristic of single inheritance !

Answer 6

A class can be extended any number of times in java, which means that a class can have multiple direct child classes

Question 7

Define Multiple levels of inheritance !

Answer 7

Multiple levels of inheritance refer to the ability of classes to form a hierarchical chain where each subclass can further extend another class, creating a chain of inheritance relationships.

When you have classes forming a hierarchy where each class extends the next in line forming a chain of inheritance, the last class in the chain inherits all the public and protected members from the first class in the chain