Java - Create an array of times (15 minute) intervals between current time and a future set time

JamLis :

I'm trying to create an array of times from the current time to a set time, for example; the current time is 15:41, I would like that to be rounded up to the nearest quarter of an hour (15:45) and an array of 15 minute intervals to be created from 15:45 to a specified time lets say 23:30.

I've managed to create an array of times for a 24 hour period in 15 minute intervals and can't seem to get any further forward.

String[] quarterHours = {"00","15","30","45"};
    String[] times = new String[24];

    for(int i = 0; i < 24; i++) {
        for(int j = 0; j < 4; j++) {
            String time = i + ":" + quarterHours[j];
            if(i < 10) {
                time = "0" + time;
            }
            times[i] = "Today " + time;
        }
    }

The output from the above in a DialogList view within Android looks as follows:

Federico klez Culloca :

You're overwriting the time each cycle of the inner loop. You should use a List<String> instead and just append without worrying about indexes, like this:

String[] quarterHours = {"00","15","30","45"};
List<String> times = new ArrayList<String>; // <-- List instead of array

for(int i = 0; i < 24; i++) {
    for(int j = 0; j < 4; j++) {
        String time = i + ":" + quarterHours[j];
        if(i < 10) {
            time = "0" + time;
        }
        times.add("Today " + time); // <-- no need to care about indexes
    }
}