Inheritance in Java

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Inheritance in Java

Madhumathi V 185824134 IV Msc Bioinformatics

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CONTENT

Inheritance in Java Terms used in Inheritance The syntax of Java Inheritance Java Inheritance Example Types of inheritance in java Single Inheritance Example Multilevel Inheritance Example Hierarchical Inheritance Example

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Inheritance in Java

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 .

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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

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The syntax of Java Inheritance class  Subclass-name  extends  Superclass-name      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. In the terminology of Java, a class which is inherited is called a parent or superclass, and the new class is called child or subclass.

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Inheritance in Java

Programmer is the subclass and Employee is the superclass. The relationship between the two classes is  Programmer IS-A Employee . It means that Programmer is a type of Employee

Java Inheritance Example

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Types of inheritance in java On the basis of class, there can be three types of inheritance in java : Single (One Super Class) Multilevel (Several Super Class) Hierarchical (One Super Class Many Subclass) In java programming, multiple and hybrid inheritance is supported through interface only. We will learn about interfaces later.

Types of inheritance in Java

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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.

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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 .

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Hierarchical Inheritance Example

When two or more classes inherits a single class, it is known as  hierarchical inheritance . In the example given below, Dog and Cat classes inherits the Animal class, so there is hierarchical inheritance.