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Is interface shape can used as a data-type?
and where as a circle can not be use as a data type when since it is not implemented shape?

public class Main {



public static void main(String[] args) {

shape circleshape=new circle();

circleshape.Draw();
}

I am 5 years experienced in programming in C but Till I cant understand the languages like Java.
what is the use of using interfaces and abstract class since they do nothing.