IT Nursery
I am interating through classes in a Jar file and wish to find those which are not abstract. I can solve this by instantiating the classes and trapping InstantiationException...
Consider an example (which compiles in java) public abstract interface Interface { public void interfacing(); public abstract boolean interfacing(boolean really); } Why is it necessary for an interface to...
This question already has answers here: Is it possible to make abstract classes in Python? (13 answers) Closed 3 years ago. I am having trouble in using inheritance with...
Data classes seem to be the replacement to the old-fashioned POJOs in Java. It is quite expectable that these classes would allow for inheritance, but I can see no...
How can I make a class or method abstract in Python? I tried redefining __new__() like so: class F: def __new__(cls): raise Exception("Unable to create an instance of abstract...
During one of my interview, I was asked “If we can instantiate an abstract class?” My reply was “No. we can’t”. But, interviewer told me “Wrong, we can.” I...
What is the difference between an abstract method and a virtual method? In which cases is it recommended to use abstract or virtual methods? Which one is the best...
How to reproduce that error as simply as possible: Java code: package javaapplication3; public class JavaApplication3 { public static void main(String args) { } } class Cat implements Animal{...