How to implement Builder pattern in Kotlin?
<p>Hi I am a newbie in the Kotlin world. I like what I see so far and started to think to convert some of our libraries we use in our application from Java to Kotlin.</p>

<p>These libraries are full of Pojos with setters, getters and Builder classes. Now I have googled to find what is the best way to implement Builders in Kotlin but no success.</p>

<p>2nd Update: The question is how to write a Builder design-pattern for a simple pojo with some parameters in Kotlin? The code below is my attempt by writing java code and then using the eclipse-kotlin-plugin to convert to Kotlin.</p>

<pre><code>class Car private constructor(builder:Car.Builder) {
    var model:String? = null
    var year:Int = 0
    init {
        this.model = builder.model
        this.year = builder.year
    }
    companion object Builder {
        var model:String? = null
        private set

        var year:Int = 0
        private set

        fun model(model:String):Builder {
            this.model = model
            return this
        }
        fun year(year:Int):Builder {
            this.year = year
            return this
        }
        fun build():Car {
            val car = Car(this)
            return car
        }
    }
}
</code></pre>