如果我不想在Kotlin中使用卑鄙的类调用基类的构造函数，该怎么办? [英] What should I do if I don't want a devired class call base class's constructor in Kotlin?

问题描述

有什么方法可以创建Derived的实例，但不能调用Base的构造函数?

Is there any way to create an instance of Derived but not call the constructor of Base?

open class Base(p: Int)

class Derived(p: Int) : Base(p)

推荐答案

您实际上可以做到

import sun.misc.Unsafe

open class Base(p: Int){
    init {
        println("Base")
    }
}

class Derived(p: Int) : Base(p){
    init {
        println("Derived")
    }
}

fun main() {
    val unsafe = Unsafe::class.java.getDeclaredField("theUnsafe").apply {
        isAccessible = true
    }.get(null) as Unsafe

    val x = unsafe.allocateInstance(Derived::class.java)

    println("X = $x")
}

但是请不要这样做，该解决方案是一种低级机制，旨在仅由核心Java库而不是标准用户使用.如果使用它会破坏OOP的逻辑.

But don't, this solution is a low-level mechanism that was designed to be used only by the core Java library and not by standard users. You will break the logic of OOP if you use it.

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