Kotlin: share variable in abstract class between extending classes [closed]

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I have an abstract class A of which the classes B and C are extending. I want to have a static variable in class A that I can get and set from B and C so that they access a shared value. Currently, using getters and setters B and C each have their own variable instance.

Honestly I don't care that much about good or bad practice, I just want to make it somehow work.

Sergio · Accepted Answer · 2020-05-02 08:35:02Z

1

You can use companion object to simulate static variable:

abstract class A {

    companion object {
        var staticVariable: Int = 0
    }
}

class B : A() {
    fun updateStaticVariable() {
        staticVariable = 1
    }
}

class C : A() {
    fun updateStaticVariable() {
        staticVariable = 2
    }
}

To access it from another place:

val sv = A.staticVariable
if (sv == 0) {
    //...
}

answered May 2, 2020 at 8:35

Sergio

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1 Comment

gidds Over a year ago

A more concise alternative is a top-level variable — defined in the same file but outside any class definitions.

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