How do I convert an element in List to String using Stream Java 8 -

i have 1 element in list<string> , want convert string using stream in java 8

i tried this

public static void main(string[] args) {     list<string> linelist = arrays.aslist("this test line");     string linestring;     linestring = linelist.stream().map(element -> linestring); } 

try : public class test {          public static void main(string[] args) {             list<string> linelist = arrays.aslist("this test line");             string linestring;             linestring = linelist.stream().map(object::tostring)                     .collect(collectors.joining(", "));             system.out.println(linestring);     }  }