OOPS concepts in Java
Java tutorials for beginners
Java basics concepts
Java Objects and Classes
What is Inheritance in Java?
What is Abstraction in Java?
What is Interface in Java?
What is Abstract Class in Java?
What is Polymorphism in Java?
What is Encapsulation in Java?
Java programming example
How Java Program Work?
Hello World in Java
Java basics for beginners
Inheritance:
The process by which one class access the properties, data and methods
of another class is called inheritance
The purpose of inheritance is re-usability code so that a class has to
write only the features and rest of the common properties and functionalities
can be extended from the another class.
importance
in Inheritance
1. Sub class or Child Class.
The class that extends another class and use the features is known as
Sub class or Child class.
2. Super Class or Parent Class.
The inherited class whose properties and functionalities are using in
another class is known as Parent class / Super class or Base class.
Example:
class class Calculator
{
int value;
public void sum(int x, int y) {
value = x + y;
System.out.println("The sum of the given numbers is "+value);
}
public
void difference(int x, int y) {
value = x - y;
System.out.println("The difference between the given numbers is
"+value);
}
}
public class
MainCalculator extends Calculator {
public
void multiple(int x, int y) {
value = x * y;
System.out.println("The multiple of the given numbers is "+value);
}
public
static void main(String args[]) {
int a = 30, b = 10;
MainCalculator obj = new MainCalculator ();
obj.sum(a, b);
obj.difference(a, b);
obj.multiple(a, b);
}
}
Types of Inheritance
1. Single
Inheritance.
2. Multilevel Inheritance.
1. Single Inheritance
In single
inheritance, sub classes inherit the features of one super class.
Example:
class class Calculator
{
int value;
public void sum(int x, int y) {
value = x + y;
System.out.println("The sum of the given numbers is "+value);
}
public
void difference(int x, int y) {
value = x - y;
System.out.println("The difference between the given numbers is
"+value);
}
}
public class
MainCalculator extends Calculator {
public
void multiple(int x, int y) {
value = x * y;
System.out.println("The multiple of the given numbers is "+value);
}
public
static void main(String args[]) {
int a = 30, b = 10;
MainCalculator obj = new MainCalculator ();
obj.sum(a, b);
obj.difference(a, b);
obj.multiple(a, b);
}
}
2.
Multilevel Inheritance.
In Multilevel Inheritance, a subclass/ derived class inherit
the features of more than one class.
Java does not support multiple inheritance with classes. We can achieve
multiple inheritance only through Interfaces.
Example:
public interface InterfaceIA {
public void sum(int x,int z);
}
public interface InterfaceIB {
public void subtraction(int x,int z);
}
public class Impl implements InterfaceIA,
InterfaceIB, InterfaceIC {
@Override
public void sum(int x,int z) {
System.out.println("Addition is "+(x+z));
}
@Override
public void substraction(int x,int z) {
System.out.println("Subtraction is "+(x-z))
}
public static void main(String[] args) {
Impl obj= new Impl();
obj.sum();
obj.subtraction();
}
}
1. Single Inheritance
In single
inheritance, sub classes inherit the features of one super class.
Example:
class class Calculator
{
int value;
public void sum(int x, int y) {
value = x + y;
System.out.println("The sum of the given numbers is "+value);
}
public
void difference(int x, int y) {
value = x - y;
System.out.println("The difference between the given numbers is
"+value);
}
}
public class
MainCalculator extends Calculator {
public
void multiple(int x, int y) {
value = x * y;
System.out.println("The multiple of the given numbers is "+value);
}
public
static void main(String args[]) {
int a = 30, b = 10;
MainCalculator obj = new MainCalculator ();
obj.sum(a, b);
obj.difference(a, b);
obj.multiple(a, b);
}
}
2. Multilevel Inheritance.
In Multilevel Inheritance, a subclass/ derived class inherit
the features of more than one class.
Java does not support multiple inheritance with classes. We can achieve
multiple inheritance only through Interfaces.
Example:
public interface InterfaceIA {
public void sum(int x,int z);
}
public interface InterfaceIB {
public void subtraction(int x,int z);
}
public class Impl implements InterfaceIA,
InterfaceIB, InterfaceIC {
@Override
public void sum(int x,int z) {
System.out.println("Addition is "+(x+z));
}
@Override
public void substraction(int x,int z) {
System.out.println("Subtraction is "+(x-z))
}
public static void main(String[] args) {
Impl obj= new Impl();
obj.sum();
obj.subtraction();
}
}
