Collectors Java

This time, I will show you how to use collectors along with streams to group by, concatenate, map, and list. Example: Convert a list of elements to a string separated by ‘,’ import java.util.List; import java.util.stream.Collectors; public class StreamToStringConverter { private String parse(){ return List.of("Java", "C++", "Lisp", "Haskell"). stream().collect(Collectors.joining(",")); } public static void main(String[] args){ var result = new StreamToStringConverter().parse(); assert "Java,C++,Lisp,Haskell".equals(result); } } From a list, generate another list selecting elements if the string length equals four. [Read More]