Classes that implement an interface have more methods

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I have an interface:

public interface IUser {
   public boolean login();
}

and two classes that implement this interface:

public class UserA implements IUser{

   public boolean login() {
       System.out.println("login");
   }

  public void update() {
      System.out.println("update");
  }
}


public class UserB implements IUser {

   public boolean login() {
       System.out.println("login");
   }

   public void delete() {
       System.out.println("delete");
   }
}

My question is if I create a user:

IUser user = new UserA();

user object doesn't have access to update() however it is recommended to create object using interface, I was wondering if there is a best practice or design pattern I can use (rather than casting it)?

asked 28 secs ago

Sam

693