// "Replace Stream API chain with loop" "true" import java.util.Arrays; import java.util.List; import java.util.Objects; public class Main { private static void test(List<String> list) { StringBuilder sb = new StringBuilder(); for (String str : list) { if (str != null) { sb.append(str); } } String result = sb.toString(); System.out.println(result); } public static void main(String[] args) { test(Arrays.asList("aa", "bbb", "c", null, "dd")); } }