Uses of Enum in java.util Classes in java.util with type parameters of type Enum Modifier and TypeClassDescription class EnumMap<K extends Enum<K>,V> A specialized Map implementation for use with enum type keys. class EnumSet<E extends Enum<E>> A specialized Set implementation for use...
enum classes cannot have finalize methods. Class<E>getDeclaringClass() Returns the Class object corresponding to this enum constant's enum type. inthashCode() Returns a hash code for this enum constant. Stringname() Returns the name of this enum constant, exactly as declared in its enum declara...
Classes cannot directly extend 'java.lang.Enum' 所以说,强扭的瓜不甜,大家一定要记住。 事实上,不仅仅Enum类本身不能被继承,上面创建的enum类StatusEnum也是不能被继承的。 这会造成一个什么问题呢? 如果这个enum是包含在一个外部jar包中的时候,你就没法对该enum进行扩展,在某些特定的情况下,这样的限制可能会...
This is the common base class of all Java language enumeration classes. More information about enums, including descriptions of the implicitly declared methods synthesized by the compiler, can be found in section { Added in 1.5. Java documentation forjava.lang.Enum. ...
Bloch specifically mentions that immutable classes that have proper control over their instances can guarantee to their clients that == is usable. enum is specifically mentioned to exemplify. 具体来说,那些提供恰当实例控制的不可变类能够保证 == 是可用的,枚举刚好符合这个条件。
The primary use-case we had when designing DataEnum was to execute different business logic depending on an incoming message. And as mentioned above, we wanted to keep all that business logic in one place, and not spread it out in different classes. With plain Java, you’d have to write...
Methods inherited from class java.lang.Enum compareTo,equals,getDeclaringClass,hashCode,name,ordinal,valueOf Methods inherited from class java.lang.Object getClass,notify,notifyAll,wait,wait,wait Enum Constant Detail ElbRegistrationInProgress public static finalTargetHealthReasonEnumElbRegistra...
* Traverses the type of a Java field or parameter to find classes annotated with @UDT. * This will recurse into nested collections, e.g. List<Set<TheMappedUDT>> 41 changes: 0 additions & 41 deletions 41 driver-mapping/src/main/java/com/datastax/driver/mapping/annotations/Enumerated.java ...
InnerClasses:static#24;//class org/example/Operator$4static#19;//class org/example/Operator$3static#14;//class org/example/Operator$2static#9;//class org/example/Operator$1 最后的InnerClasses部分解答了之前的疑惑:每一个枚举对象就是一个匿名内部类的实例。该实例在Operator类的static代码块中初始化...
官方文档:http://kotlinlang.org/docs/reference/enum-classes.html 1.枚举类(enum class) 枚举类(enumclass)基本用法,特性,和java差不多:enumclassDirection{//每个枚举常量(Enum Constants)都是一个对象,用逗号分隔NORTH,SOUTH,WEST,EAST} 2.初始化(Initialization) ...