Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions. Programmers frequently need to ...
Comparable affects the original class, i.e., the actual class is modified. Comparator doesn't affect the original class, i.e., the actual class is not modified. Comparable provides compareTo() method ...
Order has a List of OrderPosition and OderPosition has the attribute oid. oid is @Id attribute of type long. Issueing this query results in an OpenJPA Exception and i really dont want to use some ...
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