Inside Enum 1 Introduction to enum Java SE 5中引入了枚举,同时添加了一个新关键字enum。下面是个枚举的例子: public enum Suit { CLUBS, DIAMONDS, HEARTS, SPADES; } 枚举类型也是普通的Java类,继承自java.lang.Enum并默认实现了java.lang.Comparable接口和 java.io.Serializable接口。所有的枚举类型都是final...
The first line inside the enum should be a list of constants and then other things like methods, variables, and constructors. According toJava naming conventions, it is recommended that we name constant with all capital letters Important Points of enum: Every enum is internally implemented by us...
该方法通过调用java.lang.Class的 enumConstantDirectory()方法获得该枚举类型所有枚举值的map。java.lang.Class的enumConstantDirectory()方法内又通过反射调用了该枚举类型的values()方法获得所有的枚举值。需要注意的是,java.lang.Enum中并没有一个名为values()的静态方法,这个方法是编译器在编译枚举类型时添加的。
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Enum inside a ClassYou can also have an enum inside a class:Example public class Main { enum Level { LOW, MEDIUM, HIGH } public static void main(String[] args) { Level myVar = Level.MEDIUM; System.out.println(myVar); } } The output will be: MEDIUM Try it Yourself » ...
Enquiries for Enum in java How can I declare enum inside the class? Like how can I modify to make sure my code runs? Take note(Enum must be inside the class) class Sportperson { enum Country{ Usa, Brazil, Indonesia}; private Country home; private String player_name; public Sportperson...
These values inside the braces are called enum constants (values). Note: The enum constants are usually represented in uppercase. Example 1: Java Enum enum Size { SMALL, MEDIUM, LARGE, EXTRALARGE } class Main { public static void main(String[] args) { System.out.println(Size.SMALL); Sys...
Allelements inEnumMapare ordered in the natural order of map keys(the order in whichenumconstants are declared insideenumtype). It is not athread-safeclass. UseCollections.synchronizedMap()to get a thread-safe reference of this class.
Invalid inside Enum We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used....
For example, If we want that each enum type ofDirectionshould be able to print the direction name with a custom message when needed. This can be done by defining aabstractmethod insideDirection, which each enum has to override. 5. Inheritance ...