Learn Java Tutorial for Beginners, Part 26: Inheritance

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In this video by Quordnet Academy for the series Learn Java Tutorial for Beginners how to use Inheritance have been discussed.
If you would like to discover even more about java programming tutorial or the java complete course I advise you to check out the playlist :

Why multiple inheritance is not possible in Java in case of class?
Inheritance in Java is a mechanism in which one object acquires all the properties and behaviors of a parent object. It is an important part of OOPs (Object Oriented programming system).
The idea behind inheritance in Java is that you can create new classes that are built upon existing classes. When you inherit from an existing class, you can reuse methods and fields of the parent class. Moreover, you can add new methods and fields in your current class also.
Inheritance represents the IS-A relationship which is also known as a parent-child relationship.

Why use inheritance in java
For Method Overriding (so runtime polymorphism can be achieved).
For Code Reusability.
Terms used in Inheritance
Class: A class is a group of objects which have common properties. It is a template or blueprint from which objects are created.
Sub Class/Child Class: Subclass is a class which inherits the other class. It is also called a derived class, extended class, or child class.
Super Class/Parent Class: Superclass is the class from where a subclass inherits the features. It is also called a base class or a parent class.
Reusability: As the name specifies, reusability is a mechanism which facilitates you to reuse the fields and methods of the existing class when you create a new class. You can use the same fields and methods already defined in the previous class.
The syntax of Java Inheritance
class Subclass-name extends Superclass-name
{
//methods and fields
}
The extends keyword indicates that you are making a new class that derives from an existing class. The meaning of "extends" is to increase the functionality.
Single Inheritance Example
When a class inherits another class, it is known as a single inheritance. In the example given below, Dog class inherits the Animal class, so there is the single inheritance.

class Animal{
}
class Dog extends Animal{
}
class TestInheritance{
public static void main(String args[]){
Dog d=new Dog();
}}
Output:

barking...
eating...
Multilevel Inheritance Example
When there is a chain of inheritance, it is known as multilevel inheritance. As you can see in the example given below, BabyDog class inherits the Dog class which again inherits the Animal class, so there is a multilevel inheritance.

class Animal{
}
class Dog extends Animal{
}
class BabyDog extends Dog{
}
class TestInheritance2{
public static void main(String args[]){
BabyDog d=new BabyDog();
}}
Output:
weeping...
barking...
eating...

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