Shulou(Shulou.com)05/31 Report--

In this article, the editor introduces in detail "how to use EnumSet in java". The content is detailed, the steps are clear, and the details are handled properly. I hope that this article "how to use EnumSet in java" can help you solve your doubts.

Description

1. EnumSet can store elements in an enumeration, which provides a way to manipulate enumerated classes through collections.

2. All elements in the EnumSet must specify an enumeration value for the enumeration type, which is explicit or implicit when the EnumSet is created.

Example

/ * EnumSet is designed with speed in mind because it has to compete with the very efficient bit logo (which operates very fast compared to HashSet).

* internally, it (probably) takes a long value as a bit vector, so EnumSet is very fast and efficient.

* the advantage of using EnumSet is that it is more expressive when explaining whether a binary bit exists or not, and there is no need to worry about performance. * / private static void enumSet () {/ / empty constructor EnumSet weekEnums = EnumSet.noneOf (WeekEnum.class); weekEnums.add (WeekEnum.MON); weekEnums.add (WeekEnum.TUE); weekEnums.add (WeekEnum.WEB); / / of factory, which can receive multiple enum weekEnums.addAll (EnumSet.of (WeekEnum.THUR, WeekEnum.FRI, WeekEnum.SAT, WeekEnum.SUN)) System.out.println (weekEnums); / / range- range weekEnums.removeAll (EnumSet.range (WeekEnum.MON, WeekEnum.WEB)); System.out.println (weekEnums); / / create an enumeration set of the same element type as the specified enumeration set, initially containing all elements of this type that are not included in the specified set. WeekEnums = EnumSet.complementOf (weekEnums); System.out.println (weekEnums);} read here, this article "how to use EnumSet in java" has been introduced. If you want to master the knowledge of this article, you still need to practice and use it before you can understand it. If you want to know more about related articles, welcome to follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.