How do i display an ArrayLists data in GUI?

Question

Hey
Im trying to make a calendar and it works as it is suppose to with System.print.ln(), but now i want to get it you the GUI. How do i this?
My best quess is to pass the ArrayList to the GUI and then loop through the ArrayList in the GUI. After this i dont know what i to do. I want to put the data from the ArrayList, which is all the days in a month (for example 1-31 or 1-30) into labels.
Any suggentions to this?
Here is the code that i have tried with:
Makes the ArrayList:
public void showCalendarMonth(int year, int month, int daysInMonth){
        calendarMonth = new ArrayList<String>();
        for(int i = 1 ; i <= daysInMonth; i++)
            if(bookingList.checkDate(year, month, i) == "B"){
                calendarMonth.add("B"+i);
            }else{           
                calendarMonth.add(i);
public ArrayList<String> getCalendar(){
        return calendarMonth;
    }GUI:
public void makeCalendar(int year, int month, int daysInMonth){
        ArrayList<String> calendarArray = calender.getCalendar();
        for(String day : calendarArray){
            final String label = day;
            JButton button = new JButton(label);
            panel.add(button);
    }This gives me the following error:
Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

Answer 1

I think this will solve your problem.
public void makeCalendar(int year, int month, int daysInMonth){
        ArrayList<String> calendarArray = calender.getCalendar();
        for(String day : calendarArray){
            final String label = (String)day;
            JButton button = new JButton(label);
            panel.add(button);
    }