Question

I have a table of data sorted by date, from which a user can select a set of data by supplying a start and end date. The data itself is non-continuous, in that I don’t have data for weekends and public holidays.

I would like to be able to list all the days that I don’t have data for in the extracted dataset. Is there an easy way, in Java, to go:

1. Here is an ordered array of dates.
2. This is the selected start date. (The first date in the array is not always the start date)
3. This is the selected end date. (The last date in the array is not always the end date)
4. Return a list of dates which have no data.

Answer 1

You could create a temp list and x it as needed.

(Not actual Java. Sorry, my memory of it is horrible.)

dates = [...]; // list you have now;  // build list unused = []; for (Date i = startdate; i < enddate; i += day) {     unused.push(i); }  // remove used dates for (int j = 0; j < dates.length; j += 1) {     if (unused.indexOf((Date) dates[j]) > -1) { // time = 00:00:00         unused.remove(unused.indexOf((Date) dates[j]));     } }