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  1. PO
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    <p>I'm about 90% sure you're comparing <code>java.lang.String</code>s and not <code>java.util.Date</code>s. Given the date format you mentioned, it'll obviously sort all the days together first. E.g. for a full year, your list would start off:</p> <pre><code>01-01-2012 (1 Jan) 01-02-2012 (1 Feb) 01-03-2012 (1 Mar) </code></pre> <p>Use the Date object to compare on, not a String representation of it.</p> <p>P.S. a picture is not code. Put your code in your question.</p> <p><strong>Update:</strong> Proof that the code you've posted works as expected:</p> <pre><code>import java.text.DateFormat; import java.util.*; public class DateComparators { public static void main(String[] args) { List&lt;Product&gt; productList = Arrays.asList( new Product(new Date(2012 - 1900, 5, 1)), // 1 Jun 2012 new Product(new Date(2012 - 1900, 1, 1)), // 1 Feb 2012 new Product(new Date(2012 - 1900, 2, 15)), // 15 Mar 2012 new Product(new Date(2012 - 1900, 0, 2)), // 2 Jan 2012 new Product(new Date(2012 - 1900, 1, 2)), // 2 Feb 2012 new Product(new Date(2012 - 1900, 0, 1)) // 1 Jan 2012 ); Collections.sort(productList, new CustomComparator()); System.out.println(productList); } static class CustomComparator implements Comparator&lt;Product&gt; { @Override public int compare(Product o1, Product o2) { return o1.getUseBy().compareTo(o2.getUseBy()); } } static class Product { private String productName; // sauce pan private Date boughtOn; // 4-5-2012 private Date useBy; // 4-5-2012 private double boughtAt; // $4.05 private long quantity; // 9 private static DateFormat dateFormat; Product(Date useBy) { this.useBy = useBy; } public Date getUseBy() { return useBy; } public void setUseBy(Date useBy) { this.useBy = useBy; } @Override public String toString() { return "\nuseBy=" + useBy; } } } </code></pre> <p>Output:</p> <pre><code>[ useBy=Sun Jan 01 00:00:00 CST 2012, useBy=Mon Jan 02 00:00:00 CST 2012, useBy=Wed Feb 01 00:00:00 CST 2012, useBy=Thu Feb 02 00:00:00 CST 2012, useBy=Thu Mar 15 00:00:00 CDT 2012, useBy=Fri Jun 01 00:00:00 CDT 2012] </code></pre> <p>Therefore, you haven't shown us everything. The problem is in something you left out.</p>
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    1. POSorting of Arraylist by date only sorts day and not month and year?
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    1. PTAnswer
    1. USRyan Stewart
    1. USRyan Stewart
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    1. COHe is comparing the Dates.
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      1. USDavid B
    2. CO@DavidB: So he claims, yet I stand by my guess. As shown in my update, the code he has shown sorts dates correctly. We're not seeing the code that's producing the described effect.
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      1. USRyan Stewart
    3. COI just posted the code that produces this effect.
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      1. USFrank
 

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