I have a class Person having a set of Objects Contacts. I want to get a stream of Contacts from the stream of Persons.

```
public class Persons{
     private Set<Contact> contacts;
}

persons.stream().map(Person::getContacts);

```

gives me `Stream<Set<Contact>>` rather a `Stream<Contact>`

Any suggestion or help would be appreciated as I am quite new to Java 8 and Streams.