Classes in Kotlin – Part 2

Jörn — Tue, 19 Oct 2021 06:40:39 +0000

In Part 1 we dealt with the simplest form of initialization with the primary constructor:

class Planet(
    val diameter: Int,
    val distanceToSun: Double,
    val mass: Double
)

But wait: there is more:

Init block

The primary constructor cannot contain any code so init block for the rescue:

class Planet(
    val diameter: Int,
    val distanceToSun: Double,
    val mass: Double
) {
    val circumference = PI * diameter
    init {
        println(circumference)
    }
}

Notes:

You can have more than one init block
they run in order of their declaration

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Classes in Kotlin – Part 2

Init block