Note: Like regular classes, an enum class also may include constructors. To learn more about it, visitJava enum constructor. Methods of Java Enum Class There are some predefined methods in enum classes that are
for(EnumWithConstructor item : EnumWithConstructor.values()) { System.out.println(item+" "+item.getValue()); } System.out.println(SimpleEnum.UP.ordinal()); } } 总结: 1.枚举本身就是一个类。 2.它不能有public的构造函数,这样做可以保证客户代码没有办法新建一个enum的实例。 3..所有枚举值都...
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Java documentation forjava.lang.Enum. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. Constructors
In this example, we have defined an enum classDaywith constants for each day of the week along with additional fields for abbreviation and ordinal value. The constructor initializes these fields for each constant, and getter methods are provided to access the values. ...
Java enum example. The purpose of enum is to enforce compile time type safety. Learn enum constructors, methods, inheritance, EnumMap and EnumSet etc.
package com.darksnow.enums; public class EnumTest { public static void main(String[] args) { //每个枚举项都有一个默认的编号,从0开始 Direction direction1 = Direction.FRONT; Direction direction2 = Direction.BEHIND; Direction direction3 = Direction.LEFT; Direction direction4 = Direction.RIGHT; /...
Constructors EnumMap(Class) Creates an empty enum map with the specified key type. EnumMap(EnumMap) Creates an enum map with the same key type as the specified enum map, initially containing the same mappings (if any). EnumMap(IDictionary) ...
如果构造函数中存在对final字段的赋值操作,或者启用了参数-XX:+AlwaysSafeConstructors,那么C2只会在退出节点插入内存屏障而非在final字段赋值之后的每个地方插入。这样做的最终效果如代码清单9-11所示: 代码清单9-11 C2构造函数指令重排序伪代码 代码语言:javascript ...
在某些场景下我们需要动态生成一些枚举值,主要是通过反射生成,但是这种生成枚举值是不能switch的1.枚举值类public enum CodeInfoEnum { LOCK(1L, 1L, "LOCK_TYPE", "LOCK"), UNLOCK(1L, 2L, "LOCK_TYPE", "LOCK"); public Long classId; public Long i System List sed java 动态获取枚举公共类 java...