The experience of constructing injection with XML configuration in spring

If the <constructor-arg> attribute is ref , the parameter order is ignored in spring when constructing injection with XML configuration

<constructor-arg ref= "Killer"/>

<constructor-arg ref= "User"/>

And

<constructor-arg ref= "User"/>

<constructor-arg ref= "Killer"/>

The same effect (assuming that there is only one construction method, the parameter order is (Killer K, User us), these 2 kinds of notation are OK; Of course, if there is a second construction method, the parameter order is (User us, Killer K), then the second one will match the second construction method);

However, if the <constructor-arg> attribute has value , the parameter order must be considered

<constructor-arg value= "2"/>

<constructor-arg ref= "Killer"/>

And

<constructor-arg ref= "Killer"/>

<constructor-arg value= "2"/>
must correspond to 2 different construction methods respectively

The experience of constructing injection with XML configuration in spring