java: Arrays.sort() with lambda expression
The cleanest way would be:
Arrays.sort(months, Comparator.comparingInt(String::length));or, with a static import:
Arrays.sort(months, comparingInt(String::length));However, this would work too but is more verbose:
Arrays.sort(months, (String a, String b) -> a.length() - b.length());Or shorter:
Arrays.sort(months, (a, b) -> a.length() - b.length());Finally your last one:
Arrays.sort(months, (String a, String b) -> { return Integer.signum(a.length() - b.length()) }; );has the ; misplaced - it should be:
Arrays.sort(months, (String a, String b) -> { return Integer.signum(a.length() - b.length()); });