The document explains the concept of inheritance in Java, which allows a child class to inherit properties and behaviors from a parent class, promoting code reusability. It outlines different types of inheritance, including single, multilevel, and hierarchical inheritance, along with their syntactical representations and examples. Additionally, it discusses method overriding and emphasizes that multiple inheritance is not supported in Java.

1. INHERITANCE
In Java
presented by:
Rahul Paul

2. Inheritance:
In java inheritance is a mechanism which one object can get
all the properties and behaviours of a parent object. In
inheritance there is a relationship between two classes.
That’s why it is-a relationship.
For example: Bike, car, bus this
are vehicle. That’s why the
child of vehicle are bike,
car, bus and vehicle is the
parent of this objects.
Vehicle
Bike, car,
bus

3. Java inheritance:
• The important of inheritance in java program is code
reusability. We can reuse the function of parent class at
child class.
• In java we use Extends keyword for inheritance.
• Subclass and Superclass in inheritance.

4. Inheritance Syntax:
class Parent
{
//code
}
class Child extends Parent
{
//code
}
Parent
Child

5. Simple program
class super {
Public void display()
{
System.out.println(“I am parent class”);
}
}
class sub extends super {
public static void main(String args[])
{
sub message = new sub()
message.display();
}
}
Super
I am from parent class
sub
Parent class
Child classs
Output: I am parent class

6. TYPES OF INHERITANCE:
 Single inheritance.
 Multiple inheritance.
 Multi-level inheritance.
 Hierarchical inheritance.
 Hybrid inheritance.
Note: In java Multiple inheritance is not supported.

7. SINGLE INHERITANCE:
Single inheritance is the most easy type to understand. In
single inheritance a class extends another only one class. The
child class inherit only parents class. The subclass inherit the
objects of superclass.
Example: A cat is a animal.
So a cat only can inherit the
objects of animal class.
Animal
(superclass)
Cat
(subclass)

8. SAMPLE PROGRAM OF SINGLE INHERITANCE :
class message_super {
Public void display()
{
System.out.println(“I am from superclass”);
}
}
class message_sub extends message_super {
public static void main(String args[])
{
Message_sub message = new message_sub()
Message.display();
}
}
Output: I am from superclass
message_super
I am from superclass
message_sub

9. MULTILEVEL INHERITANCE
When a class extends a class, and that class extends another
class and its object then it call multilevel inheritance.
Example: a class A is parent class.
Class B is inherit the
objects of class A. Another
one class c is child of class B.
class c can inherit the objects
of class C.
A
B
C
Base class
Intermediary
class
Child class

10. SAMPLE PROGRAM OF MULTILEVEL INHERITANCE :
class a {
int data= 15; }
class b extends a {
}
class c extends b {
public void display() {
System.out.println(“number is:”+data);
}
public static void main(String args[])
{
c num= new c()
num.display();
}
}
Output: number is: 15
a
Data=15
b
c

11. HIERARCHICAL INHERITANCE:
When one superclass can be inherited by more than one
subclass then it is called hierarchical inheritance.
Example: a class A is parent class.
Class B is inherit the
objects of class A. Another
one class c also can inherit the
objects of class A.
A
B C

12. Syntax of Hierarchical inheritance:
Class Food
{
//code
}
class Rice extends Food{
//code
}
class Fruit extends Food{
//code
}
Food
Rice Fruit

13. Inheritance Method overriding:
When a method is already in parent class but also declaring
in child class, then it is known as Method Overriding.
Note: But when it is ‘Final’ method it cannot overriding.
Example: A parent class of animal
has method ‘eat’. Also a child class
tiger has method ‘eat’.
Animal
eat()
Tiger
eat()

14. Sample program of method overriding:
class animal {
public void display() {
System.out.println(“I am animal”); }
}
class tiger extends animal {
public void display() {
System.out.println(“I am tiger”);
}
public static void main(String args[]) {
tiger t = new tiger();
t.display(); }
}
Output: I am tiger

15. Thank you