Thread: using objects from one jFrame on a different jFrame

hi

I have to forms, A login form and a main form. The login form has a username, password and a combo box and a combo box that allows you to choose the type of user (cashier, supervisor and administrator). My login form works, but i want to know how i can use the selected item from the combo box in the main form. can anyone explain to me how to do this? i just started learning java this year and am struggling with this question. Below i attached a picture of the login form: Please help me
loginform.jpg

i created a constructor in the login form to determine what kind of user was selected, but it is only returning 0. The constructor is like this:

public class loggedInAs {

int logo;

loggedInAs (){
logo = cmbLogin.getSelectedIndex();
}
int whousing (){

return logo;

}

}

and i am calling it in the main frame like this:


loggedInAs user = new loggedInAs();
personloggedon = user.whousing();

why is the index of the selected item not changing?