Abstract classes allow you to create blueprints for concrete classes. But the inheriting class should implement the abstract method. Abstract classes cannot be instantiated. Important Reasons For Using Interfaces
Interfaces are used to achieve abstraction. Designed to support dynamic method resolution at run time It helps you to achieve loose coupling. Allows you to separate the definition of a method from the inheritance hierarchy
Important Reasons For Using Abstract Class
Abstract classes offer default functionality for the subclasses. Provides a template for future specific classes Helps you to define a common interface for its subclasses Abstract class allows code reusability.
Sample code for Interface and Abstract Class in Java
Following is sample code to create an interface and abstract class in Java An interface cannot be instantiated. However, classes that implement interfaces can be instantiated. Interfaces never contain instance variables but, they can contain public static final variables (i.e., constant class variables)
Difference between Interface and Abstract Class in Java
An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it. A class can extend only one abstract class while a class can implement multiple interfaces. Interface Syntax Java Interface Example: Abstract Class Syntax Abstract class example:
