can anyone explain this code , what happening when an object is created to abstract class in this case as we cannot instantiate abstract class?

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public abstract class Abs {

abstract void display(int a,int b);
void disp(){
System.out.println("hello");
}
}
abstract class help extends Abs{

}

class main{

public static void main(String[] args) {

Abs as= new Abs() {

@Override
void display(int a, int b) {
}
};

help h= new help() {

@Override
void display(int a, int b) {

}
};

}

}

Posted 28-May-15 19:28pm

shivakumar rudroju

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Sergey Alexandrovich Kryukov 29-May-15 1:44am

What would it mean, "created to a class"?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-05-28T19:51:00

Nothing happens. There is no such concept as "object created to a class". The question makes no sense, because runtime type of any object cannot be any abstract class. This is the purpose of this abstract class feature to prevent instantiation of such class.

In turn, the purpose of abstract class is to server as a base class for other classes, this way providing a common interface for the polymorphic set of objects. The objects in such set can be of different runtime types, and the code using then can be agnostic about their differences. This way different implementations of some methods can be hidden behind the facade of this base class. Such class can also be used as a base class of just one non-abstract time, for the purpose of hiding implementation detail from the user of the base class as a compile-time type.

Please see: https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html[^].

—SA