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Dependency Injection could be accomplished in two
ways either with constructor arguments
or with Setter
Getter methods.
Setter-based dependency injection
is realized by calling setters on your beans after
invoking
a no-argument constructor or no-argument static
factory method to instantiate your bean. Beans
defined
in the BeanFactory that use setter-based dependency injection are
true JavaBeans.
<bean
id="exampleBean"
class="examples.ExampleBean">
<property
name="beanOne"><ref
bean="anotherExampleBean"/></property>
</bean>
Constructor-based
dependency injection is realized by invoking a
constructor with a number of
arguments, each
representing a collaborator or property.
<bean id="exampleBean"
class="examples.ExampleBean">
<constructor-arg><ref
bean="anotherExampleBean"/></constructor-arg>
</bean>
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