static join() method joins multiple strings into one string. It is overloaded.
String join(CharSequence delimiter, CharSequence... elements)
String join(CharSequence delimiter, Iterable<? extends CharSequence> elements)
The first version takes a delimiter and a sequence of strings to be joined.
The second version takes a delimiter and an Iterable, for example, a List or Set.
The following code uses the first version to join some strings:
String str = String.join(",", "A", "F", "N", "C", "A");
System.out.println(str);
【string】
