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

Question

And, if yes.. please suggest some examples to differentiate them..

Answer 1

You are implementing an interface so you must write 'implements A.It1'. If you have an abstract method inside a class than your class must also be abstract.

public class Test implements A.It1
{
public void m1()
{System.out.println("m1");
}
public void m2()
{System.out.println("m2");
}
public static void main(String args[])
{
Test t= new Test();
t.m1();
t.m2();

}
}

abstract class A
{ abstract void m1();
interface It1
{
void m2();
}
}

Answer 2

I have covered all 3 in this small example and hope you differentiate all of them.

https://code.sololearn.com/cQuGt7nm22GQ/?ref=app

Answer 3

Avinesh -- tqq for ur reply .. it's easy to understand (differentiate) ...In case if the interface A ,classC, abstract class E have their own methods how to implement them whether to use the keyword -> (implement or extend)

Answer 4

Avinesh -https://code.sololearn.com/ch4UWD7EIeo8/?ref=app
What's the error over here ...could u please answer this question too..

Answer 5

Avinesh tqq

Answer 6

Pàví(◠‿・)—☆ you're welcome.