具有超类的Kotlin构造函数 [英] Kotlin constructor with super class

问题描述

无论尝试哪种方式，无论是主要构造方法还是次要构造方法，我都无法弄清楚如何用kotlin中的超类和构造方法声明新类.

Any way I try, be it primary constructors or secondary, I can't figure out how to declare a new class with a super class and a constructor in kotlin.

class myPanel : JPanel {
    myPanel() : super() {

    }
}

这是我最想做的事情，但它给出了一个错误，期望成员声明.

This is how i would most like t do it but it gives an error expecting member declaration.

class myPanel() : JPanel() {
    {
        ...
    }
}

这是我认为主要构造函数的外观，但是它给出了相同的错误.搜索互联网并没有帮助，我能找到的只是第二个例子.

this is how I thought a primary constructor looked but it gives the same error. Searching the internet hasn't been helpful and all I could find was the second example.

那么，使用超类及其一个构造函数创建类的所有有效方法是什么?

So, what are all of the valid ways of creating a class with a super class and its one constructor?

推荐答案

Kotlin的构造函数包含在init块中

Kotlin's constructor is contained in an init block

class Test : SuperClass() {
    init {
      // Do constructor stuff here
    }
}

更多信息可以在类的Kotlin参考中找到: https://kotlinlang.org/docs/reference /classes.html#constructors

More information can be found in the Kotlin reference on classes: https://kotlinlang.org/docs/reference/classes.html#constructors

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