java inheritance that is used in oop cls

OOP (Object Oriented programming)
March 13, 2024
Presentationtitle

Inheritance:
In java inheritance is a mechanism which one object can get all the
properties and behaviors 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

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.
Java
Inheritance

Inheritance syntax:
class Parent
{
//code
}
class Child extends Parent
{
//code
}
Parent
Child

Simple program
public 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();
}
} Output: I am parent class
Super
________________________________
I am from parent class
sub
Parent class
Child class
Java
Inheritance

Types of Inheritance:
 Single inheritance.
 Multiple inheritance.
 Multi-level inheritance.
 Hierarchical inheritance.
 Hybrid inheritance.
Note: In java Multiple inheritance is not supported.

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.
Java
Inheritance
Cat
(subclass)
Animal
(Superclass)

Syntax of Single Inheritance:
class A
{
//code
}
class B extend A
{
//code
}
B
A

Sample Program of Single Inheritance:
class message_super {
public void display()
{
System.out.println("I am from superclass");
}
}
class message_sub extends message_super {
{
message_sub message = new message_sub();
message.display();
}
}
Output: I am from superclass
Message_super
________________________________
I am from superclass
Message_sub
Java
Inheritance

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

Syntax of Multilevel Inheritance:
class A {
//code
}
class B extend A {
//code
}
class C extend B {
//code
}
Java
Inheritance
B
A
C

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);
}
{
c num = new c();
num.display();
}
}
Output: number is: 5
c
b
a
______________
Data = 5

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.
Java
Inheritance
C
B
A

Syntax of Hierarchical inheritance:
class Food {
//code
}
class Rice extends Food {
//code
}
class Fruits extends Food {
//code
}
Fruit
Rice
Food

Sample Program of Hierarchical Inheritance:
class animal {
System.out.println("I am animal");
}
}
class tiger extends animal {
System.out.println("I am tiger");
}
public static void main(String args[]) {
tiger t = new tiger();
t.display();
}
}
Java
Inheritance
Output: I am tiger

java inheritance that is used in oop cls

java inheritance that is used in oop cls

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java inheritance that is used in oop cls