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...
EnumWithConstructor(String value){ this.value=value; } } public static void main(String[] args) { System.out.println(SimpleEnum.values().length); System.out.println(SimpleEnum.UP); System.out.println(SimpleEnum.valueOf("UP")); for (EnumWithConstructor item : EnumWithConstructor.values()) ...
Two classes have been added tojava.utilpackage in support of enums –EnumSet(a high-performance Set implementation for enums; all members of an enum set must be of the same enum type) andEnumMap(a high-performance Map implementation for use with enum keys). 7.1. EnumSet EnumSetclass is a...
publicvoidtestUseSeasonEnum() { System.out.println(SeasonEnum.AUTUMN);// AUTUMN // 获取枚举类中定义的所有枚举项(每一项都是枚举,而不是字符串) finalSeasonEnum[] values = SeasonEnum.values(); for(SeasonEnum season : values) { System.out.print(season +" ");// SPRING SUMMER AUTUMN WINTER ...
It will call the Test() constructor inside the Test class. Now, the variable pizzaSize is assigned with the MEDIUM constant. Based on the value, one of the cases of the switch case statement is executed. Enum Class in Java In Java, enum types are considered to be a special type of cl...
Enum(String, Int32) Sole constructor. Enum(IntPtr, JniHandleOwnership) A constructor used when creating managed representations of JNI objects; called by the runtime. C# protectedEnum(IntPtr javaReference, Android.Runtime.JniHandleOwnership transfer); ...
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. ...
Enum Constructors and Interface Initialization Enums can have constructors that can be used to initialize fields or perform other tasks during enum constant creation. When an enum implements an interface, constructors can also be used to initialize fields required by the interface methods. For examp...
1. Creating Enum with Strings Java program tocreate anenumwith strings. The given enum contains deployment environments and their respective URLs. URLs are passed to theenum constructorfor each enum constant. publicenumEnvironment{PROD("https://prod.domain.com:1088/"),SIT("https://sit.domain.co...
publicenumDay{MON DAY(1),TUES DAY(2);privateintvalue;privateDay(intvalue){this.value=value;}}#Output:# MONDAY=1# TUESDAY=2 Java Copy In this example, we’ve defined an enumDaywith two constants:MONDAYandTUESDAY. Each constant is assigned a specific value through the enum’s constructor....