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POBest efficient way to sort Months and Year in Java
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  1. POBest efficient way to sort Months and Year in Java
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    copied!<p>I have a list which contains dates in format (MON-YYYY) in string format, I need to sort this list.The approach I have followed till now is reading the list and converting the string in date format and using compare option, but i am not getting the desired result</p> <p><strong>Code Snippet</strong></p> <pre><code>List&lt;String&gt; abc = new ArrayList&lt;String&gt;(); List&lt;Date&gt; xyz = new ArrayList&lt;Date&gt;(); abc.add("JAN-2010"); abc.add("JAN-2011"); abc.add("APR-2013"); abc.add("NOV-2009"); try { for (String abc1 : abc) { Date date; date = new SimpleDateFormat("MMM-yyyy", Locale.ENGLISH) .parse(abc1); xyz.add(date); } Collections.sort(xyz, new Comparator&lt;Date&gt;() { public int compare(Date arg0, Date arg1) { // return arg0.getDate().compareTo(o2.getDate()); return arg0.compareTo(arg1); } }); for (Date date1 : xyz) { System.out.println("Sorted : " + date1); } } catch (ParseException e) { e.printStackTrace(); } } </code></pre> <p><strong>Output</strong></p> <pre><code> Sorted : Sun Nov 01 00:00:00 IST 2009 Sorted : Fri Jan 01 00:00:00 IST 2010 Sorted : Sat Jan 01 00:00:00 IST 2011 Sorted : Mon Apr 01 00:00:00 IST 2013 </code></pre> <p><strong>Expected Output</strong></p> <pre><code>NOV-2009 JAN-2010 JAN-2011 APR-2013 </code></pre> <p>I am also not sure if the above code is perfect in performance perspective as converting the string and parsing would take a long time if I have thousands of dates in MON-YYYY format in the list. </p>
 

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