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interface vs abstract java use case

Jasper Angl answered on January 5, 2021 Popularity 7/10 Helpfulness 1/10

answer interface vs abstract java use case

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interface vs abstract java use case

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abstract class should be used primarily for objects that are closely related, 
whereas interface is best suited for providing a common functionality to unrelated classes. 

interface: If we are designing small, concise bits of functionality.
abstract class:  If we are designing large functional units.

Popularity 7/10 Helpfulness 1/10 Language java

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Tags: abstract interface java use-case

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Contributed on Mar 02 2023

Jasper Angl

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interface vs abstract class java

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an abstract class can have abstract and non-abstract instance methods while an interface can have abstract or default instance methods;
an abstract class can extend another abstract or regular class and an interface can only extend another interface;
an abstract class can extend only one class while an interface can extend any number of interfaces;
an abstract class can have final, non-final, static, non-static variables (regular fields) while an interface can only have static final variables;
an abstract class can provide an implementation of an interface but an interface cannot provide an implementation of an abstract class;
an abstract class can have a constructor and an interface cannot;
in an abstract class, the keyword abstract is mandatory to declare a method as an abstract one while in an interface this keyword is optional.

Popularity 10/10 Helpfulness 3/10 Language java

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Contributed on Jan 30 2022

coder

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interface vs abstract class java

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Interfaces specify what a class must do. 
It is the blueprint of the class.
It is used to achieve total abstraction. 
We are using implements keyword for interface.

Basic statement we all know in Selenium is
WebDriver driver = new FirefoxDriver();
WebDriver itself is an Interface.
So we are initializing Firefox browser
using Selenium WebDriver.
It means we are creating a reference variable
of the interface and creating an Object.
So WebDriver is an Interface and
FirefoxDriver is a class.

Abstract Class
1) Abstract class can contain abstract methods,
concrete methods or both
2) Except private we can have any access
specifier for methods in abstract class.
3) Except private variables can have any access
specifiers
4)We cannot achieve multiple inheritance using
abstract class.

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: abstract-class abst

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Contributed on Jan 05 2021

Obedient Ocelot

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interface vs abstract java use case

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