Kotlin 反射案例的数量相对较少,但Kotlin 提供了强大的反射库,可以让你在运行时检查和操作类、对象、接口、函数等元素。以下是一些常见的 Kotlin 反射案例:
import kotlin.reflect.KClass
import kotlin.reflect.full.declaredFunctions
import kotlin.reflect.full.memberFunctions
import kotlin.reflect.jvm.kotlinFunction
fun main() {
val kClass: KClass<String> = String::class
println("类名: ${kClass.qualifiedName}")
println("构造函数: ${kClass.primaryConstructor?.name}")
println("属性: ${kClass.declaredProperties.joinToString { it.name } }")
println("方法: ${kClass.memberFunctions.joinToString { it.name } }")
}
import kotlin.reflect.KFunction
import kotlin.reflect.full.callSuspendFunction
import kotlin.reflect.jvm.kotlinFunction
fun main() {
val kClass: KClass<String> = String::class
val function: KFunction<*> = kClass.memberFunctions.first { it.name == "plus" }
val instance = "Hello"
val result = function.callSuspendFunction(instance, " World")
println("调用结果: $result")
}
import kotlin.reflect.KClass
import kotlin.reflect.jvm.kotlinFunction
fun main() {
val kClass: KClass<String> = String::class
val constructor: KFunction<*> = kClass.primaryConstructor
val instance = constructor.call()
println("创建实例: $instance")
}
import kotlin.reflect.KClass
import kotlin.reflect.full.declaredProperties
import kotlin.reflect.jvm.kotlinProperty
fun main() {
val kClass: KClass<String> = String::class
val properties = kClass.declaredProperties
properties.forEach { property ->
if (property.name == "length") {
val getter = property.getter
val value = getter.call(null) as Int
println("原长度: $value")
val setter = property.setter
setter.call(value + 1)
println("新长度: ${property.getter.call(null)}")
}
}
}
这些案例展示了 Kotlin 反射的基本用法。你可以根据自己的需求进行扩展和深入挖掘。