java, how to join a list code example

Example 1: java join list as string

List<String> list = Arrays.asList("a","b","c");
String result = String.join(",", list);

System.out.println(result);		//prints a,b,c

Example 2: join elements in a list with , java

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