在Java swt的Arraylist中存储DateTime

Question

I'm having some problem with my program. I'm trying to get the values of the date from the dateTime widget from the org.eclipse.swt.widgets.DateTime . My program is working, when i change the date it will store in the Arraylist and print it. But my problem is I don't know if it's saving or not and how can i get the values of all the date that are stored in the Arraylist?

so far this is what I tried

public void readDateList()
{
    Calendar instance = Calendar.getInstance();
    instance.set(Calendar.DAY_OF_MONTH, dateFrom.getDay());
    instance.set(Calendar.MONTH, dateFrom.getMonth());
    instance.set(Calendar.YEAR, dateFrom.getYear());
    String strDateString = new SimpleDateFormat("yyyyMMdd").format(instance.getTime());

    ArrayList<String> alDate = new ArrayList<String>();
    alDate.add(strDateString);
    System.out.println(alDate);     
}

Answer 1

The issue is that every time you call readDateList() , the old object alDate is gone for good and you are creating a new one.

Remove alDate from the method readDateList and make it global to the class.

ArrayList<String> alDate = new ArrayList<String>(); 

Add a new method to print the list, like:

public void printList(){
    System.out.println(alDate);     
}