Tri Nguyen Tri Nguyen - 23 days ago 6
Java Question

Java - Display swing GUI

My

appointmentViewWeeks
constructor receives parameters from other classes and creates a GUI. How can I call it from my
main
method without knowing the values of
year
and
month
?

public class appointmentViewWeeks extends Frame{

public appointmentViewWeeks(String year,String month){

List<LocalDate> mondays = new ArrayList<LocalDate>();
Month m = Month.valueOf(monthIntToString(month).toUpperCase());

LocalDate date = Year.of(Integer.valueOf(year)).atMonth(m).atDay(1).
with(TemporalAdjusters.firstInMonth(DayOfWeek.MONDAY));
Month mi = date.getMonth();
while (mi == m) {
mondays.add(date);
date = date.with(TemporalAdjusters.next(DayOfWeek.MONDAY));
mi = date.getMonth();
}
String[] mondaysList = mondays.toArray(new String[0]);

JComboBox mondayList = new JComboBox(mondaysList);
JLabel welcome = new JLabel("Please choose a monday in "+month+"/"+year);

Container contentPane = getContentPane();
contentPane.add(mondayList);
contentPane.add(welcome);
}

public String monthIntToString(String month) {
return new DateFormatSymbols().getMonths()[Integer.valueOf(month)-1];
}

public static void main(String[] args) {

//windows feel and look
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException |
InstantiationException |
IllegalAccessException |
UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
appointmentViewWeeks view = new appointmentViewWeeks();
view.setVisible(true);
}
}

Answer

You will have to pass in a year and month to create it (or just two Strings), unless you add a second constructor without the String parameters:

public appointmentViewWeeks() {
    //Code to create the object without using the String parameters...
    //Maybe just call your original constructor with some default values?
}

You could also get the current year and month, and create it with your current constructor:

LocalDateTime date = LocalDateTime.now();
appointmentViewWeeks view = new appointmentViewWeeks(String.valueOf(date.getYear()),
                                                        String.valueOf(date.getMonth()));