Java: convert List<String> to a join()d String

With Java 8 you can do this without any third party library.

If you want to join a Collection of Strings you can use the new String.join() method:

List<String> list = Arrays.asList("foo", "bar", "baz");String joined = String.join(" and ", list); // "foo and bar and baz"

If you have a Collection with another type than String you can use the Stream API with the joining Collector:

List<Person> list = Arrays.asList(  new Person("John", "Smith"),  new Person("Anna", "Martinez"),  new Person("Paul", "Watson "));String joinedFirstNames = list.stream()  .map(Person::getFirstName)  .collect(Collectors.joining(", ")); // "John, Anna, Paul"

The StringJoiner class may also be useful.

All the references to Apache Commons are fine (and that is what most people use) but I think the Guava equivalent, Joiner, has a much nicer API.

You can do the simple join case with

Joiner.on(" and ").join(names)

but also easily deal with nulls:

Joiner.on(" and ").skipNulls().join(names);

or

Joiner.on(" and ").useForNull("[unknown]").join(names);

and (useful enough as far as I'm concerned to use it in preference to commons-lang), the ability to deal with Maps:

Map<String, Integer> ages = .....;String foo = Joiner.on(", ").withKeyValueSeparator(" is ").join(ages);// Outputs:// Bill is 25, Joe is 30, Betty is 35

which is extremely useful for debugging etc.

Not out of the box, but many libraries have similar:

Commons Lang:

org.apache.commons.lang.StringUtils.join(list, conjunction);

Spring:

org.springframework.util.StringUtils.collectionToDelimitedString(list, conjunction);