Incorrect username or password. Try Again!

int check = 0;
    while(check == 0)
    {
        screen.displayString("Enter the username:  ");
        String usernameLogin = keypad.getString();
        screen.displayString("Enter the password:  ");
        String passwordLogin = keypad.getString();
        for (int i = 0; i < users.size(); i++) {
            if (users.get(i).getUsername().equals(usernameLogin) && users.get(i).getPassword().equals(passwordLogin)) {
                no = users.get(i).getId();
                check = 1;
                break;
            }
            else
            {
                check = 0;
            }
        }
        if(check == 1)
        {
            break;
        }
        if (manager.getUsername().equals(usernameLogin) && manager.getPassword().equals(passwordLogin)) {
            no = manager.getId();
            check = 1;
            break;
        }
        else {
            check = 0;
        }
        if(check==0)
        {
            screen.displayStringLine("Incorrect username or password. Try Again!");
        }
    }