WHAT IS SIMILARITIES/DIFFERENCE BETWEEN AN ABSTRACT CLASS AND INTERFACE?

Anoop Singh

Total Post:37

Points:185
Posted by  Anoop Singh
Java 
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  1. Anoop Singh

    Post:37

    Points:185
    What is similarities/difference between an Abstract class and Interface?

    Differences are as follows:

    • Interfaces provide a form of multiple inheritance. A class can extend only one other class.
    • Interfaces are limited to public methods and constants with no implementation. Abstract classes can have a partial implementation, protected parts, static methods, etc.
    • A Class may implement several interfaces. But in case of abstract class, a class may extend only one abstract class.
    • Interfaces are slow as it requires extra indirection to to find corresponding method in in the actual class. Abstract classes are fast. 

    Similarities:

    • Neither Abstract classes or Interface can be instantiated.

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