Using extends in Java SWING GUI

Question

i have designed this login page and this other page for checking marks.
The idea is, if the person who logs on is the particular unique user, he will be able to check the marks of that subject, If other person who logs on and try to check the mark, he will be given a message instead.
So in order to retrieve the person's username n check to see if he can be authorized, i have to retrieve the textfield results from the login page and then implemented it into my method in the mark's page. so i just extends the Login page.
I did the dispose method n everything, and now
a) when i logged on as that user, my marks page dioesn't come out as planned, instead a login page comes out
b) when i run the marks page , the login page and my mark's page come out at the same time ?
why is this so ?

Answer 1

The reason your login page is showing up on your next panel is because you extend it. When you extend a class you inherit everything about that class including the gui. You should just make 2 seperate classes and pass in the values you want either through the constructor or make some methods to pass in the value. So what you should do is make your login class take the username and password then validate it. If the user has entered a valid username/password then pass the next class the username.Here is some suedo code I'm not going to write out everything because it would take too long.class Login extends JDialog
   private String userName;
   private String passWord;
   public Login()
       // add your textfields and other gui components
      // take in the username and password
      // verify them in some other method
      if(this.validateUser() == true)
          MarksPanel markPanel = new MarksPanel(username);
   public boolean validateUser()
        // some code to check username and password
class MarksPanel extends JPanel
   public MarksPanel(String Username)
       // now you have the username in a seprate class and
       // since you don't extend Login here you won't see the same
      // Login panel on top of this