int a;

    Parent() { a = 10; }

    Parent(int n) { a = n; }

}

​

class Child extends Parent {

    int b;

    Child() {

        //super(40);

        b = 20;

    }

    void display() {

        System.out.println(a);

        System.out.println(b);

    }

}

​

public class prog {

    public static void main(String[] args) {

        Child ch = new Child();

        ch.display();

    }

}