Join String list elements with a delimiter in one step [duplicate]

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

Java 8...

String joined = String.join("+", list); 

Documentation: http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#join-java.lang.CharSequence-java.lang.Iterable-

Answer 2

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

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