// "Collapse loop with stream 'collect()'" "true-preview" import java.util.List; import java.util.stream.Collectors; public class Test { static String test(List list) { String sb; System.out.println("hello"); sb = list.stream().filter(s -> !s.isEmpty()).map(String::trim).collect(Collectors.joining()); String s = "Result: "; s += sb; System.out.println(s); return "[" + sb + "]"; } }