companion object

SomeClass.kt

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

class SomeClass {
    //…
    companion object {
        private var count: Int = 0
        fun count() {
            count++
        }
    }
}
class AnotherClass {
    //…
    companion object Counter {
        private var count: Int = 0
        fun count() {
            count++
        }
    }
}
// usage without name
SomeClass.count()
// usage with name
AnotherClass.Counter.count()