how to join contents of list words java code example

Example 1: java list of strings to string

String string = list.stream().map(Object::toString).collect(Collectors.joining(""));

Example 2: 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