Join String list elements with a delimiter in one step

Question

Is there a function like join that returns List's data as a string of all the elements, joined by delimiter provided?

 List<String> join; ....
 String join = list.join('+");
 // join == "Elem 1+Elem 2";

or one must use an iterator to manually glue the elements?

Answer 1

You can use the StringUtils.join() method of Apache Commons Lang:

String join = StringUtils.join(joinList, "+");

Answer 2

Or Joiner from Google Guava.

Joiner joiner = Joiner.on("+");
String join = joiner.join(joinList);