Enum protected Enum(Stringname, int ordinal) Sole constructor. Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations. Parameters: name- - The name of this enum constant, which is the identifier used to declare it. ...
static <T extends Enum<T> & EnumSerialize<T>> CustomSerializationEnum getAnnotation(Class<T> enumClass) { return AnnotationUtils.findAnnotation(enumClass, CustomSerializationEnum.class); } } 复制代码 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. ...
1. EnumDemo在编译后是一个继承了java.lang.Enum类的public final class。 2. 所有列举的元素都是都是一个EnumDemo的对象。 3. EnumDemo类除了继承了Enum类的所有方法以外,JVM在编译的时候还插入了values()方法,并且重载了valueOf()方法。 综上所述,enum的实质是一个继承Enum类的final类,它包含了所有列举出...
[Android.Runtime.Register("java/util/EnumSet", DoNotGenerateAcw=true)] [Java.Interop.JavaTypeParameters(new System.String[] {"E extends java.lang.Enum<E>"})]publicabstractclassEnumSet:Java.Util.AbstractSet,IDisposable,Java.Interop.IJavaPeerable,Java.IO.ISerializable,Java.Lang.ICloneable ...
public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) Creates an enum set containing all of the elements in the specified element type. Type Parameters: E - The class of the elements in the set Parameters: elementType - the class object of the element type for this ...
[Android.Runtime.Register("java/lang/Enum", DoNotGenerateAcw=true)] [Java.Interop.JavaTypeParameters(new System.String[] { "E extends java.lang.Enum<E>" })] public abstract class Enum : Java.Lang.Object, IDisposable, Java.Interop.IJavaPeerable, Java.IO.ISerializable, Java.Lang.IComparab...
Type parameters: <T> –the type of the class modeled by this Class object. For example, the type of String.class is Class<String>. Use Class<?> if the class being modeled is unknown. 每个类都有一个 ClassLoader 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public final class Class...
(Configuration parameters)throws Exception{super.open(parameters);this.todayPv=getRuntimeContext().getState(newValueStateDescriptor<Map<Tuple2<DimNameEnum,String>,Long>>("todayPv",TypeInformation.of(newTypeHint<Map<Tuple2<DimNameEnum,String>,Long>>(){})));}@Overridepublicvoidprocess(Long aLong,...
super.open(parameters); this.todayPv = getRuntimeContext().getState(new ValueStateDescriptor<Map<Tuple2<DimNameEnum, String>, Long>>( "todayPv", TypeInformation.of( new TypeHint<Map<Tuple2<DimNameEnum, String>, Long>>() { }))); } @Override public void process(...
关键词enum可以将一组具名值的有限集合创建成一种新的类型,而这些具名的值可以作为常规程序组件使用。 枚举最常见的用途便是替换常量定义,为其增添类型约束,完成编译时类型验证。 1.1. 枚举定义 枚举的定义与类和常量定义非常类型。使用enum关键字替换class关键字,然后在enum中定义“常量”即可。