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interface vs abstract class java

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coder answered on November 30, 2020 Popularity 10/10 Helpfulness 3/10

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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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Tags: abstract-class interface java

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Contributed on Jan 30 2022

coder

0 Answers Avg Quality 2/10

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difference between abstract and interface

Comments(1)

Interface 
1) Interface contains only abstract methods 
2) Access Specifiers for methods in interface
must be public
3) Variables defined must be public , static ,
final
4) Multiple Inheritance in java is implemented
using interface
5) To implement an interface we use
implements keyword

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.
5)To implement an interface we use implements
keyword

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Source: Grepper

Tags: abstract abstrac

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Contributed on Nov 30 2020

Thankful Tuatara

0 Answers Avg Quality 2/10

abstract vs interface

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Abstract class:
	- Share code for multiple related classes
    - Some implementations as shared code
    - This class must be inherited (using 'extend' keyword)
Interface:
	- Define a contract between multiple unrelated classes, no shared code 
    - No implementations at all
    - It is a contract that must be implemented by those who accept the contract (using 'implements' keyword')
    - It tells what to do, the class those implement it tells how to do it

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Source: Grepper

Tags: abstract abstrac

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Contributed on Aug 08 2023

Innocent Iguana

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abstract class vs interface

Comment

An abstract class can contain both abstract and non-abstract members
(methods, properties, fields, etc.), while an interface can only contain 
abstract members.

A class can inherit from only one abstract class, but it can implement multiple
interfaces.

An abstract class can provide an implementation for some or all of its members,
while an interface cannot provide any implementation for its members.

An abstract class can define constructors and destructors, while an 
interface cannot.

An abstract class can use access modifiers (public, private, etc.) to control 
the visibility of its members, while an interface's members are always public 
by default.

Popularity 10/10 Helpfulness 4/10 Language csharp

Source: chat.openai.com

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Contributed on Dec 08 2022

ekkamrit

0 Answers Avg Quality 2/10

abstract class vs interface

Comment

Interfaces specify what a class must do and not how. 
It is the blueprint of the class.
It is used to achieve total abstraction. 

We are using implements keyword for interface.

Abstract=
Sometimes we may come across a situation
where we cannot provide implementation to
all the methods in a class. We want to leave the 
implementation to a class that extends it.
  In that case we declare a class
as abstract by using abstract keyword on method
signature.In my framework I have created my
PageBase class as super
class of the all page classes. 
I have collected all common elements
and functions into PageBase class and
all other page classes extent PageBase class.
By doing so, I don't have to locate very
common WebElements and it provides
reusability in my framework.
Also
1)Abstract classes cannot be instantiated
2)An abstarct classes contains abstract method,
concrete methods or both.
3)Any class which extends abstarct class must
  override all methods of abstract class
4)An abstarct class can contain either
  0 or more abstract method.

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Source: Grepper

Tags: abstract-class abst

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Contributed on Dec 05 2020

Obedient Ocelot

0 Answers Avg Quality 2/10

difference between interface and abstract class

Comment

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.

Sometimes we may come across a situation
where we cannot provide implementation to
all the methods in a class. We want to leave the 
implementation to a class that extends it.
  In that case we declare a class
as abstract by using abstract keyword on method
signature.In my framework I have created my
PageBase class as super
class of the all page classes. 
I have collected all common elements
and functions into PageBase class and
all other page classes extent PageBase class.
By doing so, I don't have to locate very
common WebElements and it provides
reusability in my framework.
Also
1)Abstract classes cannot be instantiated
2)An abstarct classes contains abstract method,
concrete methods or both.
3)Any class which extends abstarct class must
  override all methods of abstract class
4)An abstarct class can contain either
  0 or more abstract method.

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: abstract-class abst

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Contributed on Jan 05 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

interface vs abstract class java

Comment

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

0 Answers Avg Quality 2/10

interface vs abstract class

Comment

--Difference between Abstract class and Interface-

Abstract class                      Interface
1. An Abstract class can have
abstract and non-abstract
methods.
                                    An Interface can have only abstract  methods. Since
                                    Java 8, it can have default and static methods also.
2. An Abstract class doesn't
support multiple inheritance. .
                                    An Interface supports multiple inheritance. .
3. An Abstract class can have
final, non-final, static and 
nonstatic variables .
                                    An Interface has only static and final variables .
4. An Abstract class can provide
the implementation of interface.
.
                                    An Interface can't provide the implementation of
                                    abstract class .
5. An abstract class can extend
another Java class and implement
multiple Java interfaces.
                                    An interface can extend another Java interface only.
6. A Java abstract class can have
class members like private,
protected, etc.
                                    Members of a Java interface are public by default.

Popularity 10/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: abstract-class abst

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Contributed on Nov 21 2022

TUSHAR KADAM

0 Answers Avg Quality 2/10

diff between abstract class and interface

Comment

public class BusinessLogic : IBusinessLogic
{
   public void Initialize()
   {
       println("hello"); 
   }
}

Popularity 9/10 Helpfulness 1/10 Language java

Source: www.infoworld.com

Tags: abstract-class abst

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Contributed on Feb 22 2023

KAKAROT

0 Answers Avg Quality 2/10

interface vs abstract java use case

Comment

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 6/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: abstract interface java jav

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Contributed on Mar 02 2023

Jasper Angl

0 Answers Avg Quality 2/10

interface vs abstract class java

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