bag

I find myself very intrigued by the existence of a ConcurrentBag<T> class in the upcoming .NET 4.0 framework: Bags are useful for storing objects when ordering doesn't matter, and unlike sets, bags support duplicates. My question is: how might this idea be implemented? Most collections I'm familiar with essentially amount to (under the hood) some form of array, in which order may not "matter," but there is an order (which is why, even though it doesn't need to, enumeration will pretty much always go through an unchanged collection, be it List , Queue , Stack , etc. in the same sequence). If I

Following is my code Here I am using multiple lists to fetch data from database. On fetching data from hql query it is showing exception. Pojo Class public class BillDetails implements java.io.Serializable { private Long billNo; // other fields @LazyCollection(LazyCollectionOption.FALSE) private List<BillPaidDetails> billPaidDetailses = new ArrayList<BillPaidDetails>(); private Set productReplacements = new HashSet(0); @LazyCollection(LazyCollectionOption.FALSE) private List<BillProduct> billProductList = new ArrayList<BillProduct>(); //getter and setter } hmb.xml file <class name="iland.hbm