Inheritance in Java смотреть онлайн

In this tutorial we will discuss the real world analogy for inheritance. We will also discuss base and child classes in java.

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What is a Base Class in Java
- also called superclass or parent class
What is a Derived Class in Java
- also called subclass or child class
What is inherited by derived class
- non-private variables, methods etc
- properties and behaviour that it can see

Benefits of Inheritance

- Keep common code in base class
- DRY (Do not repeat yourself) principle
- Easy to maintain
- Extensibility (adding new implementations)
- Keep specialized behavior in derived classes

Note : All java classes inherit from java.lang.Object class implicitly or explicitly

Derived class can hide or override base class members
Abstract method are those methods that are with no body
Abstract class are classes with abstract method
Base class can be abstract or concrete
IS A relationship in java

Note : Abstract base class forces all derived classes to add their own implementations for all abstract methods