将文本从Jtextfield（Jframe）发送到另一个类

Question

i put text on a JTextfield and i try to use that text in another class ... i have no error but no result

    btnEntrez.addActionListener(new AuthentificationListner());

public class AuthentificationListner implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {

    Authentification aut = new Authentification();
    String login = aut.txtnom.getText();
    System.out.println("Login :"+login);

}

result : Login : (But no textfield text :/ )

Answer 1

If Authentification is a JFrame , then aut.txtnom.getText() isn't going to return anything (other than what it was initialized with) as the user won't have time to enter anything before you try and grab the value, this is what JDialog is for. See How to make dialogs for more details.

Swing, like most UI frameworks is event driven, something happens, you respond to it, rather the procedural or linear (which your code seems to be trying to do)

Another approach is to use an observer pattern on Authentification , which will notify interested parties that something (they might be interested in) has changed.