1. Use the interface Calculator: interface Calculator { double squreRoot(int n); double pow(int n); double exponent(int arv_a, int arv_e); } 2. Add class Helper, which implements the interface Calculator. Add the main method into Helper class. 3. Create an object inside the Helper and realize the methods from the Calculator 4. Using interface Calculator make the necessary changes and create the abstract class Calculator2 5. Create new subclass Helper2, what realise the abstract methods. Use the main class in Helper2 and check the results. 6. Try to use interface javax.naming.Name. Create the class which implements the interface. Use method add (String comp) in your class for overwriting the same method of interface. Add all necessary for demonstation of your method and your class.