7--Basic usage of spring--8 ...

7.8 In-depth understanding of beans in containers

7.8.1 Abstract bean and child bean

Extract the same information from multiple <bean.../> configurations into a configuration template------This configuration template is not a real bean, so spring should not create the configuration template, so it needs to be for the <bean.../> The configuration adds abstract= "True"------This is the abstract bean.

Abstract beans cannot be instantiated, and spring containers do not create instances of abstract beans. The value of an abstract bean is inherited, and abstract beans are usually inherited as parent beans.

Abstract Bean is simply a template for configuration information, specifying abstract= "true" prevents spring from instantiating the bean, so the abstract bean can not specify the class attribute.

　　　　　　　　

7--Basic usage of spring--8 ...