Help about Interfaces in Java

Question

I need some help with Interfaces since I'm really new to OOP.
I have 1 interface, 1 class implementing the interface and 1 main function. Here is the structure:
public interface t_action
      public boolean isvalid(int a, int b);
public class sec implements t_action
     public boolean isvalid(int a, int b)
     /* Implmentation of this method */
public class main()
     public static void main(string args[])
          boolean valid = false;
          /* Need to call isvalid in public class sec
              and assign it to the "valid" variable above
}My Question is:
How do i call the method "isvalid" in class sec that implements the t_action interface? I need to assign it to my variable "valid" in class main
Any help is appreciated.
Thanks.
MAZ@McMaster Engineering

Answer 1

Hey all...
Thanks for your contribution.
As I said earlier here: "I'm new to Java" so cut me some slack!!!
I've been doing C programming all my life so java is similar but quite foreign to me since I started learning it recently on my own
If this were a normal class and not an interface, it would be:
class_name myclass = new class_name();
myclass.isvalid(a, b);But why is it:
interface_name i = new class_implementing_interface();
i.isvalid(a,b);Thanks