RPM是用于保存和管理RPM软件包的仓库。我们在RHEL和Centos系统上常用的Yum安装就是安装的RPM软件包，而Yu...
自Kotlin 1.1 起,可以使用 enumValues<T>() 和enumValueOf<T>() 函数以泛型的方式访问枚举类中的常量。 1.4.1、访问枚举变量属性 例: fun main(args: Array<String>) { println("name = " + Color.RED.name + "\tordinal = " + Color.RED.ordinal) println("name = " + Color.WHITE.name + "...
return enumValues<Months>().any { == name } } fun main(args: Array<String>) { if (enumContains("")) { println(Months.valueOf("")) } else { println("The string value does not match with any of the enum constants.") //this gets printed. } } 1. 2. 3. 4. 5. 6. 7. 8...
*/// 使用枚举常量// EnumClass.valueOf(value: String): EnumClass// EnumClass.values(): Array<EnumClass>// enumValues<T>()// enumValueOf<T>()enumclassRGB{ RED, GREEN, BLUE }inlinefun<reifiedT : Enum<T>>printAllValues(){ print(enumValues<T>().joinToString { it.name }) } printA...
提供了values()和valueOf()方法来检测指定的名称与枚举类中定义的任何枚举常量是否匹配。 2.7 委托 2.7.1 类委托 一个标准类委托的实现如下: //创建接口 interface Base { fun print() } //实现此接口的被委托的类 class BaseImpl(val x: Int) : Base { ...
*/ public fun booleanArrayOf(vararg elements: Boolean): BooleanArray /** * Returns an array containing enum T entries. */ @SinceKotlin("1.1") public inline fun <reified T : Enum<T>> enumValues(): Array<T> /** * Returns an enum entry with specified name. */ @SinceKotlin("1.1")...
Hint 1: Define an enum class named Color with predefined color values. Hint 2: Create a data class that includes a name property and a color property of type Color. Hint 3: In the main() function, create instances of the data class with different colors from the enum class. Hint 4: ...
Process finished with exit code 0 How enum class is different from a regular class You cannot create new instances of an Enum class outside of its definition. In other words outside enum definition, you cannot create an object of type Enum Class by passing values to its primary constructor....
enum class NumberV2(val value: Int) { ONE(1), TWO(2), THREE(3); companion object { private val map = NumberV2.values().associateBy { it.value } infix fun from(value: Int) = map[value] } } Copy As the code above shows, we’ve first used the associateBy() function to transfor...
3. Working with Enum Constants Kotlin 也像 Java 一样提供了列出已定义的枚举常量的方法,以及根据名称获取枚举常量的方法,这些方法的签名如下(假设枚举类名为EnumClass): [code lang=”kotlin”]EnumClass.valueOf(value: String): EnumClass EnumClass.values(): Array[/code] ...