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).

1. Types Of Inheritance In Java
2. Simple Hierarchical Inheritance Program In Java
3. Simple Multilevel Inheritance Program In Java
4. Simple Example Of Inheritance
5. Simple Hybrid Inheritance Program In Java

Simple Program on Inheritance; C++ program to show how a constructor function in a class works; C++ program to implement the use of pointer object array to a class C++ program to show the practical implementation of a class and object in real time applications; C++ program for the creation and utilization of data structure. So there are many advantages of using inheritance in Java: Reusability: Child class can use the data members and function defined in the parent class. Using the same code for parent and child class, reduce the line of code. Testing and debugging code will be easier. The syntax for Inheritance: The extends keyword is used to depict inheritance in Java.

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.

Multiple inheritance is not supported in JAVA. Inheritance is one of the important concept of object oriented programming. The simple definition says inheritance provides mechanism that allows a class to inherit properties of another class. Inheritance Concept: Inheritance means inherit the properties and behavior of existing object in a new. In this java tutorial, we will understand the working of hierarchical inheritance in java with a program example. Hierarchical inheritance is again an extenstion to single inheritance as there are multiple single inheritance in this type. Inheritance in java is one of the core concepts of Object Oriented Programming. Inheritance is used when we have is-a relationship between objects. Inheritance in Java is implemented using extends keyword. Table of Contents. 1 Inheritance in Java 1.1 Java Inheritance Example. 1.2 Java Inheritance Program Output. Programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build. Simple inheritance example. Federico Minarelli. Greenhorn Posts: 29. Posted 8 years ago. Hello everybody! I was trying to write a simple example of inheritance and I have a doubt if mine could be a good.

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

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.

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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.

Java Inheritance Example

As displayed in the above figure, 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.

In the above example, Programmer object can access the field of own class as well as of Employee class i.e. code reusability.

Types Of Inheritance In Java

Types of inheritance in java

On the basis of class, there can be three types of inheritance in java: single, multilevel and hierarchical.

In java programming, multiple and hybrid inheritance is supported through interface only. We will learn about interfaces later.

Note: Multiple inheritance is not supported in Java through class.

When one class inherits multiple classes, it is known as multiple inheritance. For Example:

Single Inheritance Example

File: TestInheritance.java

Output:

Multilevel Inheritance Example

File: TestInheritance2.java

Output:

Hierarchical Inheritance Example

File: TestInheritance3.java

Simple Hierarchical Inheritance Program In Java

Output:

Q) Why multiple inheritance is not supported in java?

To reduce the complexity and simplify the language, multiple inheritance is not supported in java.

Consider a scenario where A, B, and C are three classes. The C class inherits A and B classes. If A and B classes have the same method and you call it from child class object, there will be ambiguity to call the method of A or B class.

Since compile-time errors are better than runtime errors, Java renders compile-time error if you inherit 2 classes. So whether you have same method or different, there will be compile time error.

Simple Multilevel Inheritance Program In Java

Simple Example Of Inheritance

Simple Hybrid Inheritance Program In Java