import javax.swing.Box;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Anmeldung {

	public static void main(String[] args) {

		JTextField username = new JTextField(5);
		JTextField password = new JTextField(5);
		JPanel myPanel = new JPanel();
		int again = 0;

		myPanel.add(new JLabel("Username:"));
		myPanel.add(username);
		myPanel.add(new JLabel("Password:"));
		myPanel.add(password);

		while (again == 0) {

			int result = JOptionPane.showConfirmDialog(null, myPanel, "Username and Password", JOptionPane.OK_OPTION);

			String u = username.getText();
			String p = password.getText();

			if (result == 0) {

				if (u.equals("test")) {
					if (p.equals("test")) {
						JOptionPane.showMessageDialog(null, "Login sucessfull");
						again = 1;
					}
				} else {
					JOptionPane.showMessageDialog(null, "Login failed");
					again = JOptionPane.showConfirmDialog(null, "Try again?");
				}
			}
			again = 1;

		}
	}

}