Inheritance in java

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Inheritance in Java

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inheritance in java

• What is Inheritance?
•  
• Inheritance is a mechanism in which one class
  acquires the property of another class. For
  example, a child inherits the traits of his/her
  parents. With inheritance, we can reuse the
  fields and methods of the existing class. Hence,
  inheritance facilitates Reusability and is an
  important concept of OOPs.
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Important terminology

•  Super Class The class whose features are
  inherited is known as super class(or a base class
  or a parent class).
• Sub Class The class that inherits the other
  class is known as sub class(or a derived class,
  extended class, or child class). The subclass can
  add its own fields and methods in addition to the
  superclass fields and methods.
• Reusability Inheritance supports the concept of
  reusability, i.e. when we want to create a new
  class and there is already a class that includes
  some of the code that we want, we can derive our
  new class from the existing class. By doing this,
  we are reusing the fields and methods of the
  existing class.

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Types of Inheritance in Java

• There are Two Types of Inheritance
• Single Inheritance
• Mulilevel Inheritance
• Multiple Inheritance
• Hierarchical Inheritance
• Hybrid Inheritance

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Types of Inheritance in Java

• Single Inheritance
• In the concept of single inheritance, one class
  provides an extension to another class (only one
  class). It simply means that class A extends to
  class B. In such a way, Class B extends only
  class A. This way class A is known as a
  superclass and class B is known as the subclass.
• Multilevel Inheritance
• In this, one class can access and inherit
  properties from the derived class. Thus, the
  derived class becomes the base class for the new
  class. For instance, class C is considered as the
  subclass of B and B is the subclass of class A.

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Types of Inheritance in Java

• Hierarchical Inheritance
• In this concept of hierarchical inheritance, one
  class is inherited by many subclasses. For
  instance, class A, B, and C inherit the same
  class D.
• Multiple Inheritance
• In the concept of multiple inheritances, one
  class extends more than one class. Hence, Java is
  not able to support multiple inheritances. For
  instance, class C extends both class A and class
  B respectively.
• Hybrid Inheritance
• It is just a combination of single and multiple
  inheritances. For instance, all the protected and
  public members of class A are inherited into the
  class D, first through class B and another
  through class C.

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