"extends" used with a wildcard {"?"} such as SomeCollection<? extends T> makes sense to me. After reading stackoverflow, I am only somewhat more enlightened on what SomeCollection<? super T> means, how it is used, and why one might want to use it.Trent.On Sat, May 21, 2016 at 6:18 PM James Mcphee <jmcphe@gmail.com> wrote:Check the answer to this stackoverflow. It says it better than I can. http://stackoverflow.com/questions/3009745/what-does-the-question-mark-in-java-generics-type-parameter-meanOn Sat, May 21, 2016 at 1:08 PM, trent shipley <trent.shipley@gmail.com> wrote:Can anyone tell me what the keyword "super" does in this parameter list for the constructor below? I can only find documentation for the more mundane use when a method references an ancestor.
public WeightedCollection(Comparator<? super E> comp)
package pcgen.base.util;
<</ deleted stuff>>
/**
* Constructs an empty WeightedCollection with the given Comparator used to
* establish equality and order in the WeightedCollection.
*
* @param comp
* The Comparator this Set will use to determine equality and
* order of the WeightedCollection
*/
public WeightedCollection(Comparator<? super E> comp)
{
if (comp == null)
{
theData = new ListSet<WeightedItem<E>>();
}
else
{
theData = new TreeSet<WeightedItem<E>>(
new WeightedItemComparator<E>(comp));
}
}------------------------------------------------------------------------------------------------------
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