It is used to construct a sequence of characters separated by a delimiter. Now, you can create string by passing delimiters like comma(,), hyphen(-) etc.
You can also pass prefix and suffix to the char sequence.- jdk1.8
Constructor – public StringJoiner(CharSequence delimiter,CharSequence prefix,CharSequence suffix)*/
// importing StringJoiner class import java.util.StringJoiner; public class StringJoinerExp { public static void main(String[] args) { StringJoiner a = new StringJoiner(",", "[", "]"); // passing comma(,) and square-brackets as delimiter StringJoiner b = new StringJoiner(",", "{", "}"); // passing comma(,) and square-brackets as delimiter a.add("Rahul"); a.add("Raju"); a.add("Babu"); a.add("Kalu"); b.add("Pooja"); b.add("Priya"); b.add("Pinki"); System.out.println(a); System.out.println(b); StringJoiner merge = a.merge(b); System.out.println(merge); } }
Join String by a delimiter
StringJoiner sj = new StringJoiner(","); sj.add("aaa"); sj.add("bbb"); sj.add("ccc"); String result = sj.toString(); Join String by a delimiter and starting with a supplied prefix and ending with a supplied suffix. StringJoiner sj = new StringJoiner("/", "prefix-", "-suffix"); sj.add("2016"); sj.add("02"); sj.add("26"); String result = sj.toString(); Join String by a delimiter. //2015-10-31 String result = String.join("-", "2015", "10", "31" ); Join Listexample. List list = Arrays.asList("java", "python", "nodejs", "ruby"); //java | python | nodejs | ruby String result = list.stream().map(x -> x).collect(Collectors.joining(" | "));