java - Delete consecutives values in ArrayList of Int -

i have created arraylist 30 000 values, after been sorted, have lot of consecutive values, example:

22001 22002 22003 22004 22010 22011 22020

and want have : 22001 22004 22010 22011 22020

arraylist<long> l = new arraylist<long>(); // values collections.sort(l); arraylist<long> liste = new arraylist<long>(); 

i didn't test it, should work (for lists containing 3 or more elements). it's unoptimized regarding memory usage.

arraylist<long> resultlist= new arraylist<long>(); long prevnumber= l.get(0); (int = 1; < l.size() - 1; i++) {     if (prevnumber.equals(l.get(i) - 1) && l.get(i + 1).equals(l.get(i) + 1)) {         //print 'inbetween' consecutive number     } else {         //not consecutive, copy result list         resultlist.add(l.get(i));     }     prevnumber= l.get(i); }