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package inheritInterface;

interface it1 {

int x = 10, y = 20;

public void add(int a, int b);

public void sub(int a, int b);

}

class arithmOp implements it1 {

public void add(int p, int q) {

System.out.println("Addition of two numbers: " + (p + q));

}

public void sub(int p, int q) {

System.out.println("Addition of two numbers: " + (p - q));

}

public class StudentInterface {

public static void main(String[] args) {

// TODO Auto-generated method stub

arithmOp obj = new arithmOp();

obj.add(10, 15);

obj.sub(15, 10);

System.out.println(it1.x + it1.y); // This works without errors (actually a wrong method - don't use)

System.out.println(obj.x + obj.y); // This works but gives errors.

}