I’d like to be able to refer to an object from wit...

# announcements

[Ellen Spertus]

I’d like to be able to refer to an object from within itself, like this:

val r: Runnable = Runnable {
        println("In runnable")
        r.run()
    }

(I know the code would generate a stack overflow; it’s an oversimplification of what I really want to do.)

How can I do this? Changing r from val to var has no effect. Do I need to create a second variable and make it refer to the first value?

lateinit var r2: Runnable

    var r: Runnable = Runnable {
        println("In runnable")
        r2.run()
    }
    
    init {
        r2 = r
    }

[Dominaezzz]

Convert it from lambda to anonymous object.

[Casey Brooks]

Make it a lazy { } property

[Ellen Spertus]

Thanks, @Dominaezzz, but I still get the error Variable 'r' must be initialized with:

val r: Runnable = object: Runnable {
        @Override
        override fun run() {
            println("In runnable")
            r.run()
        }
    }

[Ellen Spertus]

Thanks, @Casey Brooks! That did the trick:

val r: Runnable by lazy {
        Runnable {
            println("In runnable")
            r.run()
        }
    }

[Dominaezzz]

That's what I meant.

val r: Runnable = object: Runnable {
        @Override
        override fun run() {
            println("In runnable")
            this.run()
        }
    }

[Ellen Spertus]

Thanks a lot, @Dominaezzz!

[Kroppeb]

this seems to work:

Untitled