Example 1: Basic Enum enumDay{SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY;}publicclassEnumExample{publicstaticvoidmain(String[]args){Day today=Day.MONDAY;System.out.println("Today is: "+today);}} In
Declaration of enum in Java:Enum declaration can be done outside a Class or inside a Class but not inside a Method. Java // A simple enum example where enum is declared // outside any class (Note enum keyword instead of // class keyword) enumColor { RED, GREEN, BLUE; } publicclass...
We can extend existing enum without breaking any existing functionality. For example, we can add a new field NEW in ThreadStates enum without impacting any existing functionality. Since enum fields are constants, java best practice is to write them in block letters and underscore for spaces. For...
java 24th Aug 2021, 2:56 AM Rishi + 3 Use ordinal method. Example: test.zero.ordinal() returns 0. 24th Aug 2021, 3:11 AM 你知道規則,我也是 + 2 You can do asCarrieForlehas suggested, or if you want want to always get the integer value as a String returned instead of the name...
importjava.util.EnumMap; public class EnumMapExample { public static void main(String[] args) { // Create an EnumMap that contains all constants of the Car enum. EnumMap cars = new EnumMap(Car.class); // Put some values in the EnumMap. ...
In Java, enum classes are final by default. Hence, we cannot inherit other classes from it. For example, enum A { // enum constants // fields and methods } class B extends A { public static void main(String[] args) { // statements } } # Error: cannot inherit from final A Inher...
java packagecom.example.webdemo.entity;importcom.example.webdemo.enumeration.GenderEnum;importlombok.Data;@DatapublicclassUser{privateLong id;privateString name;privateInteger age;privateGenderEnum gender; } 数据库中字段 sql CREATETABLE`t_user` ( `id`bigintunsignedNOTNULLAUTO_INCREMENT, `name`varchar...
We use the enum keyword to define an enumeration in Java. It is a good programming practice to name the constants with uppercase letters. Simple exampleWe have a simple code example with an enumeration. Main.java enum Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } ...
Enum类是所有Java语言枚举类型的通用基类。枚举类型是一种特殊的数据类型,用于定义一组固定的常量值。 以下是Enum类的主要方法和功能: name():返回枚举常量的名称,与在枚举声明中声明的名称相同。 ordinal():返回枚举常量的序号,即在枚举声明中的位置,初始常量的序号为0。 toString():返回枚举常量的名称,通常用于以...
问Java8:将EnumMap<ExampleEnum、String>转换为Map<String、Object>ENMap<String,Object>newMap=map....