Spring promotes Dependency Injection (DI) in code. It gives

support for injecting not only objects but also collection of objects.

We can inject collections like- list, set, map etc. in Spring.

Following tags can be used for this purpose:

: This type is used for injecting a list of values. In a

duplicates are allowed.

: This type is used for injecting a set of values. As per set

property, duplicates are not allowed.

map. Name and value can be of any type that is allowed for a map.

: This type is used to inject a collection of String based

name-value. It is like a properties file.

https://www.baeldung.com/spring-injecting-collections