我正在学习Kotlin,目前使用Fedora 25 OpenJDK 8和Kotlin 1.1。Kotlin Reflection运算符得到实现
我复制了Kotlin网站的示例:https://kotlinlang.org/docs/reference/delegated-properties.html并更改了get运算符。
class Example {
var p: String by Delegate()
}
class Delegate {
operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
// My implementation
return property.getter.call(thisRef) as String
}
operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
println("$value has been assigned to '${property.name} in $thisRef.'")
}
}
阅读反思文档,吸气预计的对象实例,并没有其他的参数,但我只取得了以下错误。 (错误的缩写,因为它太大了,它在递归。)
.
.
.
at info.malk.Example.getP(Delegation.kt)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at kotlin.reflect.jvm.internal.FunctionCaller$Method.callMethod(FunctionCaller.kt:98)
at kotlin.reflect.jvm.internal.FunctionCaller$InstanceMethod.call(FunctionCaller.kt:115)
at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:107)
at info.malk.Delegate.getValue(Delegation.kt:32)
at info.malk.Example.getP(Delegation.kt)
.
.
.
Caused by: java.lang.reflect.InvocationTargetException
... 1024 more
Caused by: java.lang.StackOverflowError
... 1024 more
Process finished with exit code 1
帮助。
您递归调用了'p'吸气。你想达到什么目标? – nhaarman
我怀疑是这种情况,我想通过反射/委派来实现getter的帮助。 – Malkaviano