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4.26. Instantiate an ArrayList Object Using a Static Factory Method
- Follow this example to instantiate an ArrayList object using a static factory method:
<jb:bean beanId="orders" class="java.util.List" factory="some.package.ListFactory#newList" createOnElement="orders" > <!-- ... bindings --> </jb:bean>
Thesome.package.ListFactory#newList
factory definition establishes that thenewList
method must be called on thesome.package.ListFactory
class in order to create the bean. The class attributes define the bean as a List object. The specific kind of List object that it is (be it an ArrayList or a LinkedList), is decided by the ListFactory itself. - Observe this additional example:
<jb:bean beanId="orders" class="java.util.List" factory="some.package.ListFactory#getInstance.newList" createOnElement="orders" > <!-- ... bindings --> </jb:bean>
This defines that an instance of the ListFactory needs to be retrieved using the static methodgetInstance
and then thenewList
method needs to be called on the ListFactory object to create the List object. This construct lets you use singleton factories.