--constructor in spring by constructing automatic assembly

In spring, you can use automatic assembly by construction, which is actually automatically assembled by the parameter type of the constructor. This means that if the data type of a bean is the same as the data type of the constructor parameters of other beans, it will be automatically assembled.

 Package Auto_constructor; /**  */Publicclass  student    {public  String getName () {         return name;    }      Public void setName (String name) {        this. Name = name;    }      Private   String name;}

 Package Auto_constructor; /**  */Publicclass  school    {public  School (student St) {         this. st=St;    }      Public Student Getst () {        return  st;    }     Private student St;}

<!--  Construction method Injection   is actually automatically assembled by the parameter type of the constructor--    class= "Auto_constructor.student" >        <property name= "name" value= "Cat" ></property>    </bean>    class= "Auto_ Constructor.school "Autowire=" constructor "></bean>

In spring, "auto-assemble by automatic detection" means that if there is a default constructor (parameter and any data type) The constructor injection is installed, and if no constructor is automatically assembled by type.

<bean id= "Student" class= "auto_constructor.student" >        <property name= "name" value= "Cat" ></ property>    </bean>    <bean id= "School" class= "Auto_constructor.school" autowire= "AutoDetect" ></bean>

--constructor in spring by constructing automatic assembly