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collection valued asociation used in JPA

I would like to know about collection valued asociation used in JPA. How, where, why we use it. I was not clear on this concept. Thanks in advance
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gudii9
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gudii9
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for_yanCommented:
raed about collection valued types here:
http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/collections.html

Naturally Hibernate also allows to persist collections. These persistent collections can contain almost any other Hibernate type, including: basic types, custom types, components and references to other entities.
As a requirement persistent collection-valued fields must be declared as an interface type (see Example 7.2, “Collection mapping using @OneToMany and @JoinColumn”). The actual interface might be java.util.Set, java.util.Collection, java.util.List, java.util.Map, java.util.SortedSet, java.util.SortedMap or anything you like ("anything you like" means you will have to write an implementation of org.hibernate.usertype.UserCollectionType).

there are also some code examples of JPA annotations for collection valued field in the link above


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