Generating a list of Start Times and End Times in Java -

Generating a list of Start Times and End Times in Java -

i need generate list of start times , end times in java such that, end time greater start time , difference between start time , end time must maximum of 5 hours.

time format can of either 24 hours or 12 hours.

i tried code difference between start time , end time criteria not satisfied start times , end times:

string mytime = "07:00:00"; simpledateformat df = new simpledateformat("hh:mm:ss"); date d = df.parse(mytime); calendar cal1 = calendar.getinstance(); cal1.settime(d); calendar cal2 = calendar.getinstance(); cal2.settime(d); int i=10; list<string> list3 = new arraylist<string>(); list<string> list4 = new arraylist<string>(); while(i<50) { cal1.add(calendar.minute, i); string start_time = df.format(cal1.gettime()); cal2.add(calendar.second, i); string end_time = df.format(cal2.gettime()); list3.add(start_time); list4.add(end_time); i=i+1; } file file = new file("output9.txt"); fileoutputstream fos = new fileoutputstream(file); printstream ps = new printstream(fos); system.setout(ps); (int j = 0,k=0;j < list3.size()&&k<list4.size(); j++,k++) { string value3 = list3.get(j); string value4 = list4.get(k); system.out.println("\n"); system.out.printf("%s%s%s",value3," ",value4); }

could please help me how it?

thanks in advance...

i guess problem in add-on of starttimes. add together n minutes starttime, add together amount seconds of endtime.

so schould alter next int while:

cal1.add(calendar.minute, i); string start_time = df.format(cal1.gettime()); cal2.add(calendar.minute, i); // add together line cal2.add(calendar.second, i); string end_time = df.format(cal2.gettime());

if want real random ranges, accomplish setting start random time, save string array , add together amount of time between 0 , 5 hours , add together end array.

edit illustration random ranges

random rand = new random(); simpledateformat df = new simpledateformat("hh:mm:ss"); calendar calendar = calendar.getinstance(); list<string> starttimes = new arraylist<string>(); list<string> endtimes = new arraylist<string>(); (int = 0; < 50; i++) { calendar.set(calendar.hour_of_day, 7 + rand.nextint(7)); // starting @ 07:00:00 calendar.set(calendar.minute, rand.nextint(60)); calendar.set(calendar.second, rand.nextint(60)); string start_time = df.format(calendar.gettime()); calendar.add(calendar.hour, rand.nextint(5)); calendar.add(calendar.minute, rand.nextint(60)); calendar.add(calendar.second, rand.nextint(60)); string end_time = df.format(calendar.gettime()); starttimes.add(start_time); endtimes.add(end_time); }

this generate 50 starttimes 7 14 , endtimes maximum of 5 hours longer. example:

[13:38:56, 08:32:57, 08:50:15, 07:10:49, 13:48:06] [13:45:53, 08:36:29, 12:16:35, 11:19:06, 17:19:36]

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