This post demonstrates how to create static class members similar to that of Java. We use Kotlin 1.1 here.

All static members Class

If we want to create a class that only contains static members, we use singletons in Kotlin. For example:

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package com.turreta.kotlin

/**
 * Created by Turreta.com on 20/6/2017.
 */
object AllStaticMembersClass {

    // Don't allow change
    val applicationName: String = "SuperKotlinDemo App"

    var numberOfUsers: Int = 0
}


// main function
fun main(args: Array<String>) {
    println(AllStaticMembersClass.applicationName)

    println(AllStaticMembersClass.numberOfUsers)

    AllStaticMembersClass.numberOfUsers = 10

    println(AllStaticMembersClass.numberOfUsers)
}

package com.turreta.kotlin

/**

* Created by Turreta.com on 20/6/2017.

object AllStaticMembersClass {

// Don't allow change

val applicationName: String = "SuperKotlinDemo App"

var numberOfUsers: Int = 0

}

// main function

fun main(args: Array<String>) {

println(AllStaticMembersClass.applicationName)

println(AllStaticMembersClass.numberOfUsers)

AllStaticMembersClass.numberOfUsers = 10

println(AllStaticMembersClass.numberOfUsers)

}

Outputs:

SuperKotlinDemo App
0
10

SuperKotlinDemo App

Static and non-static members in class

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Sometimes we have classes that have both static and non-static class members in Java. In Kotlin, we can mix static and non-static members in one class. For example:

package com.turreta.kotlin

/**
 * Created by Turreta.com on 20/6/2017.
 */
class NonStaticAndStaticMembersClass {

    // Don't allow change
    val applicationName: String = "SuperKotlinDemo App"

    companion object {
        var numberOfUsers: Int = 0
        fun showAbout() {
            println("About...")
        }
    }
}

// main function
fun main(args: Array<String>) {

    var o: NonStaticAndStaticMembersClass = NonStaticAndStaticMembersClass()

    println(o.applicationName)

    println(NonStaticAndStaticMembersClass.numberOfUsers)

    NonStaticAndStaticMembersClass.numberOfUsers = 15

    println(NonStaticAndStaticMembersClass.numberOfUsers)

    NonStaticAndStaticMembersClass.showAbout()
}