Abstract Class Vs Interface In Java

However the interface offers full abstraction in java something that abstract classes cannot do.

Abstract class vs interface 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. An interface can be implemented using keyword implements. Interface can have only abstract methods. Sample code for interface and abstract class in java.

3 an abstract class can have both abstract and concrete methods. 7 an abstract class can be extended using keyword extends. From java 8 it can have default and static methods also. Abstract class interface and their difference.

A class can extend only one abstract class while a class can implement multiple interfaces. It is a collection of abstract methods and contains no concrete methods unlike abstract class. 8 a java abstract class can have class members like private protected etc. The interface keyword is used to declare interface.

Java core java 8 java concurrency java advanced java app. Variables declared in a java interface are by default final. Data structure algorithm algorithm overview. 6 an abstract class can extend another java class and implement multiple java interfaces.

Theory and principle computer network. 1 an abstract class can extend only one class or one abstract class at a time an interface can extend any number of interfaces at a time. 2 an abstract class can extend another concrete regular class or abstract class an interface can only extend another interface. An interface is a blueprint used to implement a class.

An abstract class may contain non final variables.