```fun interface MCall2{ fun updateMyText(text: String) } class Testing : MCall2 { var st: S...

# announcements

[Ananiya]

fun interface MCall2{
    fun updateMyText(text: String)
}
class Testing : MCall2 {
    var st: String? = null
    override fun updateMyText(text: String){
        st = text
    }
    init {
        print(st)
    }

}
@Test
    fun check_the_call_back(){

        Testing().updateMyText("trying to re assign")


    }

I was trying to reassign st value with in SAM is it possible tho , this returns null btw

[Youssef Shoaib [MOD]]

Well basically from what I can understand you want to change that text then print it out right? Well in that case then you actually need to have that print statement inside of updateMyText instead of it being in the init block

[Ananiya]

Well the goal is updateMyText() to re assign the just value and on the init{} actually I wasn't using it, instead I used function to print out the value just for simplicity reading used init since there's not that much difference

[Youssef Shoaib [MOD]]

well it does depend on how your actual code is structured. init only gets run once right when the object is created. If possible, could you provide an example of what your actual code was?

[Ananiya]

Ok well

[Ananiya]

fun interface MCall2{
    fun updateMyText(text: String)
}
class Testing : MCall2 {
    var st: String? = null
    override fun updateMyText(text: String){
        st = text
    }
    fun reveal() {
        print(st)
    }
    fun `return`():String? = st

}
@Test
    fun check_the_call_back(){

        Testing().updateMyText("trying to re assign")
        Testing().reveal()
        print(Testing().`return`())


    }

[Youssef Shoaib [MOD]]

There we go. Well basically what you're doing right now is that you're creating a new instance of the Testing class every time that you're calling a method on it, and so in reality when you call reveal you're calling it on a brand new instance. The solution here is simple, in your test method, you need to store a Testing object and then call methods on it. Here's basically how it needs to be:

[Youssef Shoaib [MOD]]

@Test
    fun check_the_call_back(){
        val myTestingObject = Testing()
        myTestingObject.updateMyText("trying to re assign")
        myTestingObject.reveal()
        print(myTestingObject.`return`())
    }

[Ananiya]

Oof I never realised that ,thank you