Inheritance and its types

INHERITANCE

Inheritance is one of the main ideas in Object-Oriented Programming (OOP).
It allows one class to use the properties and methods of another class.

In simple terms, Inheritance means creating a new class from an existing class.
The new class (called the child class) can use the fields and methods of the old class (called the parent class).

Example: Animal is the base class and Dog, Cat and Cow are derived classes that extend the Animal class

Types of inheritance

• Single Inheritance
• Multilevel Inheritance
• Hierarchical Inheritance
• Multiple Inheritance
• Hybrid Inheritance

SINGLE INHERITANCE

In single inheritance, a sub-class is derived from only one super class. It inherits the properties and behavior of a single-parent class. Sometimes, it is also known as simple inheritance

For example :

//Super class
class Father {
void work() {
System.out.println("Father is working hard");
}
}

// Subclass
class Son extends Father {
void play() {
System.out.println("Son is playing friends");
}
}

public class Single1 {
public static void main(String[] args) {

    Son s = new Son();

        s.work();
        s.play();
}

}

MULTILEVEL INHERITANCE

In Multilevel Inheritance, a derived class will be inheriting a base class and as well as the derived class also acts as the base class for other classes.

For example

class CEO {
void showCEO() {
System.out.println("I am the CEO of the company");
}
}

class Manager extends CEO {
void showManager() {
System.out.println("I am the Manager under the CEO");
}
}

class Employee extends Manager {
void showEmployee() {
System.out.println("I am the Employee working under the Manager");
}
}

public class Multilevel{
public static void main(String[] args) {

    Employee emp = new Employee();


    emp.showCEO();      
    emp.showManager();   
    emp.showEmployee();  
}

}

HIERARCHICAL INHERITANCE

In hierarchical inheritance, more than one subclass is inherited from a single base class more than one derived class is created from a single base class. For example, Mobile,Brand and Ram

For example

class Mobile {
void mobileDetails() {
System.out.println("This is a Mobile Device");
}
}

class Brand extends Mobile {
void brandName() {
System.out.println("Brand nothing");
}
}

class Ram extends Mobile {
void ramSize() {
System.out.println("RAM 8GB");
}
}

public class Hierarchical {
public static void main(String[] args) {

    Brand b = new Brand();
    b.mobileDetails(); 
    b.brandName();     

    System.out.println();


    Ram r = new Ram();
    r.mobileDetails(); 
    r.ramSize();       
}

}