Java™ How To Program (Early Objects), Tenth Edition

17.5.2 Filtering Strings Then Sorting Them in Case-Insensitive Ascending Order

Lines 24–28 filter and sort the Strings. Line 25 creates a Stream<String> from the array strings, then line 26 calls Stream method filter to locate all the Strings that are greater than "m", using a case-insensitive comparison in the Predicate lambda. Line 27 sorts the results and line 28 collects them into a List<String> that we output as a String. In this case, line 27 invokes the version of Stream method sorted that receives a Comparator as an argument. As you learned in Section 16.7.1, a Comparator defines a compare method that returns a negative value if the first value being compared is less than the second, 0 if they’re equal and a positive value if the first ...