Implementing the commands

Here, we have AbstractCommand, which is an abstract class with one execute method. This is the abstract command, and the execute method is implemented on the subclasses:

public abstract class AbstractCommand {

    public abstract String execute();
}

In the following code snippet, we have the subclass HomeCommand, which is the implementation of AbstractCommand. The method execute() returns the path to the home page (/home.jsp):

public class HomeCommand extends AbstractCommand {
    @Override
    public String execute() {
        return "/home.jsp";
    }
}

Here, we have the LoginCommand subclass, which is the implementation of AbstractCommand. The execute() method returns the path to the login page (/login.jsp):

public class LoginCommand extends AbstractCommand {
    @Override
    public String execute() {
        return "/login.jsp";
    }
}