Java 8 lambda create list of Strings from list of custom class objects

You need to collect your Stream into a List:

List<String> adresses =

For more information on the different Collectors visit the documentation.

User::getAdress is just another form of writing (User user) -> user.getAdress() which could as well be written as user -> user.getAdress() (because the type User will be inferred by the compiler)

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