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POSorting of Arraylist by date only sorts day and not month and year?
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  1. POSorting of Arraylist by date only sorts day and not month and year?
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    copied!<p>I'm attempting to SORT an ArrayList by (Type Date) MyObject.getDate()</p> <p>My format is formatted by SimpleDateFormat by dd-mm-yyyy; I'm using a custom comparator to sort my list. I'm using Collections.sort(produuctList, new CustomComparator())</p> <p>Problem my sorted list is only by dd and not dd-mm-yyyy.</p> <p>Any ideas?</p> <pre><code>public class Product { private String productName; private Date boughtOn; private Date useBy; private double boughtAt; private long quantity; private static DateFormat dateFormat; public Date getUseBy() { return useBy; } public void setUseBy(Date useBy) { this.useBy = useBy; } } public static Date rtnDate(String dateStr, int currentLineCount) { SimpleDateFormat df = new SimpleDateFormat("dd-mm-yyyy"); try { Date date = df.parse(dateStr); return date; } catch (ParseException e) { productParsingErrorMessages.add("Date parse exception: " + e + "on line " + currentLineCount); return null; } // DateFormat formatter = new SimpleDateFormat("dd-mm-yyyy"); // Date date2 = (Date)formatter.parse(dateStr); } </code></pre> <blockquote> <pre><code>System.out.println("Product list - BEFORE sorting by UseBy"); printInventory(produuctList); Collections.sort(produuctList, new CustomComparator()); System.out.println("Product list - AFTER sorting by UseBy"); printInventory(produuctList); </code></pre> </blockquote> <pre><code>public class CustomComparator implements Comparator&lt;Product&gt; { @Override public int compare(Product o1, Product o2) { return o1.getUseBy().compareTo(o2.getUseBy()); } } </code></pre> <p>Product list - BEFORE sorting by UseBy</p> <p>Product name: sugar UseBy : 12-12-2012<br> Product name: sugar UseBy : 01-10-2012<br> Product name: sugar UseBy : 16-04-2012<br> Product name: sugar UseBy : 30-01-2012<br> Product name: sugar UseBy : 25-04-2012<br> Product name: sugar UseBy : 03-04-2012<br> Product name: sugar UseBy : 08-04-2012 </p> <p>Product list - AFTER sorting by UseBy</p> <p>Product name: sugar UseBy : 01-10-2012<br> Product name: sugar UseBy : 03-04-2012<br> Product name: sugar UseBy : 08-04-2012<br> Product name: sugar UseBy : 12-12-2012<br> Product name: sugar UseBy : 16-04-2012<br> Product name: sugar UseBy : 25-04-2012<br> Product name: sugar UseBy : 30-01-2012</p>
 

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