Q&A Discussions

What is the difference between abstract and interface in java ?!

28th Aug 2017, 3:29 PM

Swetha Srilakshmi

0 Votes

Why do we use abstract classes if we have the Normal ones....??

16th Dec 2016, 10:01 AM

Dalia Sharif

abstract help in plz python

1 Vote

Abstract classes can not be instantiated, but does it have constructor?

27th Jun 2021, 3:45 PM

Manish Patel

abstract-classes c#

0 Votes

have you ever used interface in your project???

13th Jun 2017, 5:54 PM

Kundan

abstract interface java

4 Votes

8 Answers

6th Mar 2017, 4:45 PM

Somnath Ghosh

Why are constructors allowed in an abstract classes if it cannot be instantiated?

abstract-classes c#constructors oop

1 Vote

How to use an abstract class and one concrete class be extending in other concrete class

14th Jul 2019, 12:25 PM

Rohan Rao

please anyone can clarify the concept of abstract class and interfaces in detail plz

0 Votes

7 Answers

11th Apr 2018, 1:25 PM

Dispssin SP

Hi! I'm a bit confused. So why to use abstract despite of virtual?

0 Votes

4 Answers

5th Nov 2016, 2:43 PM

Mumtaz Hayat

abstract-classes c#

1 Vote

In java android i d'ont understand what is @override and what is the abstract

14th Apr 2016, 6:09 AM

Andrei David

android java kotlin

1 Vote

in java.awt package Graphics is an abstract class so how we can create the Graphics class object and call the methods.

16th Sep 2018, 1:46 PM

Hamza Adaoud

Say that I'm wrong, but I'm sure you can instanciate abstract classes

9 Votes

8 Answers

7th Nov 2019, 10:21 AM

Saroj Patel

-1 Vote

I am wondering where to learn the generic type and abstract class in java

18th Oct 2018, 6:46 PM

Keheck

java robotic

0 Votes

whether the nested interface has 3 types:interface within a interface, interface within a class,interface within a abstract cls

8th Nov 2018, 9:49 PM

frank tong

interfaces java

1 Vote

6 Answers

13th Sep 2020, 5:27 PM

Pàví(◠‿・)—☆

What is the need of interface, if the work done by interface ..can also be done by an abstract class?

interfaces java

2 Votes

6 Answers

13th Aug 2019, 7:07 PM

Arpita Jha

Can anyone please tell why abstract classes are faster in implementing than interfaces.

abstraction java

0 Votes

What is the distinction between an abstract data type and implementation of data type

18th Jun 2018, 8:22 PM

Dhruv Walia

help me please

0 Votes

Can someone please factorize these 2 classes with an abstract class ? And changing them accordingly?

30th Sep 2022, 12:18 PM

Meek jeez

abstract abstract-classes factorize java methods overriding

0 Votes

Why we create abstract method insted of normal method? At the first place

16th Dec 2019, 8:17 PM

AdL

abstract-classes codind java

0 Votes

I have 3 question about C++(continue)

18th Jul 2017, 2:55 AM

lzy gyz

abstract c++function

3 Votes

why we cannot write constructor in interface? while we can write constructor in abstract class?

5th Aug 2017, 10:07 AM

Yusuf

abstract can cannot class?constructor in interface?we while why write

0 Votes

Is PrintStream class a absract class??

21st Mar 2018, 1:49 PM

Prathamesh Dhuri

abstract java printstream

2 Votes

Can you please explain how to use an abstract class because i cannot initialize it.

9th Aug 2018, 7:20 AM

ARNAB KUMAR DAS

0 Votes

Can we call a constructor of parent most abstract class from a child most class?

2nd Jun 2017, 4:29 AM

DoubleVermine

1 Vote

So when do we use virtual methods and when do we use abstract classes?

28th May 2017, 6:01 PM

Pradyumna Kumar Barik

c#inheritance

0 Votes

Hi everybody , please what is differnce between abstract class and interface and how to choose the usefull one

26th Jul 2016, 2:03 PM

Ihusaan Ahmed

[SOLVED]: AbstractCollection

0 Votes

4 Answers

10th Jul 2021, 7:22 AM

‎Abdul Jalil

abstract abstractcollection abstractlist abstractmap abstractset

16 Votes

How is it possible for the abstract class Calendar to have a method that return its instance?

15th Nov 2020, 7:04 AM

Chris Ng

abstract-classes calendar

0 Votes

Create an abstract class called "Animal" and four derived classes Cow, Horse, Tiger, and Lamb.

22nd Mar 2021, 5:41 PM

Allan Jackson

abstract-classes c++member-funtion

-1 Vote

Anybody else thinks that the information on sololearn is presented in an overly dry, complicated and abstract manner?

20th Nov 2020, 12:14 PM

Something New

sololearn

0 Votes

5 Answers

30th Aug 2017, 5:05 PM

yves R

I do not clearly undurstand abstract classes in Java programming Language. I just want to see one concrete example to understant

what's wrong in the codes

2 Votes

7 Answers

10th Jul 2017, 11:20 PM

Stephcyrille

abstract interface java

1 Vote

Why do we use abstract method when we can directly declare normally.i cant see the difference

24th Apr 2017, 11:46 AM

shobhit

0 Votes

abstract abstract-classes beginner kotlin

12th Feb 2019, 11:30 PM

chanukya mahidhar

Purpose of Abstract?

1 Vote

5 Answers

17th Dec 2022, 9:55 PM

William Owens

can someone tell me how to use abstract class and not how to make them please

abstract-classes c#

1 Vote

About virtual and abstract : Why does the repair-method display "Repair a sportbike " ?

2nd Jun 2017, 4:32 AM

DoubleVermine

c#override virtual

1 Vote

How select rows from table SQL same names in one column in python code? in abstract form names.

1st Jan 2018, 9:41 PM

sneeze

python3 sql

0 Votes

What is the difference between list,tuple,dictionaries in real time.I don't need abstract answer.How do I know which one to use?

25th Oct 2021, 1:45 PM

Evgeniy Nartov

python

0 Votes

6 Answers

8th Jun 2017, 7:34 PM

phani indra

what is the point in abstract classed? what can they do to help me? when should i use them?

4 Votes

Is abstract classes are necessary when there is an option called interface is available in java?

5th Apr 2017, 6:11 PM

PaperGami T.

abstract-classes classes compiler interfaces java

0 Votes

All interface methods are implicitly

26th Jul 2018, 3:59 AM

viki

abstract final private protected public

5 Votes

5 Answers

27th Apr 2019, 4:19 AM

Charitha Sri

Write a java program which includes the inheritance, Super keyword, Method Overloading, Method Overriding concept, Abstract k

-3 Votes

how to call non static methods that are already in abstract class inside main class static method in java?

12th Aug 2021, 7:36 PM

Sumukh Gk

abstract class coding java methodcalling non-static programming static

1 Vote

What is the purpose of abstract class. Explanation needed with real world example. The scenario where it is used.

1st Mar 2020, 6:36 AM

D ̲E ̲S ̲S ̲I ̲E ̲- ̲B ̲A ̲H ̲I ̲R ̲U ̲

0 Votes

For java intermediate, in abstract classes, I cannot complete the practice assignment even though I checked the solutions.

1st Jun 2018, 2:52 AM

RamaLakshmi Moorthi

0 Votes

What is the use of this abstract method? If it doesn't do anything, why not just defining it in the subclasses?

17th Aug 2023, 7:09 PM

Mario Reategui

I read abstract classes cannot be instantiated.But I cant understand it without example. Can anyone explain this line?

3 Votes

4 Answers

9th Aug 2016, 4:52 PM

Oliver Kratz-Lieber

0 Votes

A class that is used to manipulate data elements as objects. A. Primitive B. Wrapper C. Abstract D. String

8th Aug 2019, 5:50 AM

Geek

1 Vote

"To use an abstract class, you have to inherit it from another class" I donot understand the meaning of this sentence

21st Aug 2016, 11:51 AM

Nardz

2 Votes

If we define a class as abstract, then it class must contains AT LEAST ONE SINGLE ABSTRACT METHOD THAT MUST BE IMPLEMENTED.

25th Jun 2018, 10:35 AM

Tom

abstract class definition java

0 Votes