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    <p>java.util.Date is a quite poor abstraction for your need; it is IMO fair to stick to strings if nothing better is around, HOWEVER <a href="http://joda-time.sourceforge.net/" rel="nofollow noreferrer">Joda-time</a> provides a good datatype for you: <a href="http://joda-time.sourceforge.net/api-release/org/joda/time/DateMidnight.html" rel="nofollow noreferrer">DateMidnight</a> or alternatively <a href="http://joda-time.sourceforge.net/api-release/org/joda/time/LocalDate.html" rel="nofollow noreferrer">LocalDate</a> if Activity is strictly timezome-independant.</p> <p>other than that, the code looks good to me, you might be able to shorten it a bit using an implementation of <a href="http://google-collections.googlecode.com/svn/trunk/javadoc/index.html?com/google/common/collect/Multimap.html" rel="nofollow noreferrer">Multimap</a>, to avoid messy null-checking code. to be honest, it doesn't get much shorter than your solution:</p> <pre><code> public List&lt;Activity&gt; groupedByDate(List&lt;Activity&gt; input) { //group by day final Multimap&lt;DateMidnight, Activity&gt; activityByDay = Multimaps.index(input, new Function&lt;Activity, DateMidnight&gt;() { @Override public DateMidnight apply(Activity from) { return new DateMidnight(from.activityDate); } }); //for each day, sum up amount List&lt;Activity&gt; ret = Lists.newArrayList(); for (DateMidnight day : activityByDay.keySet()) { Activity ins = new Activity(); ins.activityDate = day.toDate(); for (Activity activity : activityByDay.get(day)) { ins.amount+=activity.amount; } } return ret; } </code></pre>
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    1. POGrouping objects by date: am I an idiot?
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    1. CODate is fine for his purposes, imho you succeeded in making a simple algorithm needlessly more complex.
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