Preferred Idiom for Joining a Collection of Strings in Java

Question

Given a Collection of Strings, how would you join them in plain Java, without using an external Library?

Given these variables:

Collection

        

Answer 1

Collectors can join Streams which is very useful if you want to filter or map your data.

String joined = Stream.of("Snap", "Crackle", "Pop")
        .map(String::toUpperCase)
        .collect(Collectors.joining(", "));

To get a Stream from a Collection, call stream() on it:

Arrays.asList("Snap", "Crackle", "Pop").stream()