popup

import javax.swing.*;
import java.util.Scanner;

public class TEST {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String username = JOptionPane.showInputDialog("Username");
        String password = JOptionPane.showInputDialog("Password");
        if (
                username != null &&
                        password != null &&
                        ((username.equals("svetlyo") &&
                                password.equals("password") ||
                                (username.equals("test")
                                        && password.equals("test"))
                        ))
        ) {
            JOptionPane.showMessageDialog(null, "You are in");
        } else {
            JOptionPane.showMessageDialog(null, "Wrong");
        }
    }
}