package Interface;

interface A {
    public void display();
    default void display2(){
        System.out.println("Default access specifier");
    }
}

interface C extends A{
    public int square(int a);
}

class B implements A {
    @Override
    public void display(){
        System.out.println("Display method");
    }

    public int square(int a){
        return a*a;
    }
}

public class MainClass {

    public static void main(String[] args) {
        B b = new B();
        b.display();
        b.display2();
        System.out.println(b.square(6));
    }
}