javaenums 4 我必须使用 switch 语句来获取枚举值。这是枚举: public enum Compass { NORTH, SOUTH, EAST, WEST; } 我在枚举外的另一个类中执行了以下操作: Compass.values()[0].name() 但是这本书说实现的方法是: Compass[] comp = { Compass.NORTH, Compass. SOUTH, Compass.EAST, Compass.WES...
@Color("Yellow") BANANA, @Color("Green") PEAR } public class EnumWithAnnotationExample { public static void main(String[] args) { // 遍历枚举常量,获取注解信息 for (Fruit fruit : Fruit.values()) { Color
Introduction to Using Interfaces in Java Enums In Java, enums are a special kind of class that can contain constants and methods. They provide a way to define a set of named values, often representing a fixed number of options or choices. One powerful feature of Java enums is their abili...
This method is commonly used in combination with the for-each construct to iterate over the values of an enum type. 大致意思就是,Java 编译器在编译枚举类的时候会自动为该类加入一些静态方法,比如说 values() ,这个方法返回一个包含这个枚举类所有枚举项的数组,这个数组是按照声明的顺序来排列(意味着 ...
You can add fields to a Java enum. Thus, each constant enum value gets these fields. The field values must be supplied to the constructor of the enum when defining the constants. Here is an example: public enum Level { HIGH (3), //calls constructor with value 3 ...
A fork of enumify that enables Java-like enums in TypeScript. typescriptenums UpdatedJul 27, 2017 TypeScript Flexible JavaScript enums using ES6 Proxies. javascriptenumenums UpdatedAug 23, 2023 JavaScript Actual C# Enums with values and better performance as a source generator ...
You can add fields to a Java enum. Thus, each constant enum value gets these fields. The field values must be supplied to the constructor of the enum when defining the constants. Here is an example: public enum Level { HIGH (3), //calls constructor with value 3 ...
This method may be used to iterate over the constants with the enhanced for statement. The enhanced for goes through the array, element by element, and prints them to the terminal. $ java Main.java It is Monday MONDAY MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY SATURDAY SUNDAY Providing values to...
at com.stubbornjava.examples.common.EnumLookup.main(EnumLookup.java:154) 拙劣的实现 很不幸的是,以下两种方法在代码库中出现得是这么的频繁。反面例子,勿学。 Enum.valueOf With Try Catch(劣) 这种拙劣的做法最常见于初学者。异常不应该用于控制流,并且这样可能会有一些性能影响。不要偷懒。你必须用正确的方...
Therefore, it’s a good idea to use this set whenever we want to work with a collection of enum constants in most scenarios (like subsetting, adding, removing, and bulk operations likecontainsAllandremoveAll), and useEnum.values()if we just want to iterate over all possible constants. ...