### Question:
StrCollectionUtils { public static String longestStr(Collection<String> strList) { return Collections.max(strList, Comparator.comparing(String::length)); }  static String longestStr(Collection<String> strList); static String shortestStr(Collection<String> strList); static int maxStrLength(Collection<String> strList); static int minStrLength(Collection<String> strList);  }### Answer:
@Test void longestStr() { }