Form.kt

class CheckBox(){
    var isChecked: Boolean = false

    fun click(){
        isChecked = !isChecked
    }
}

class TextView(private var text: String){
    fun click(){
        //... some code
    }

    fun setText(text: String){
        this.text = text
    }
    
    fun getText() = this.text
}

fun main(){
    val frenchCheckBox = CheckBox()
    val frenchTextView = TextView("Are you french?")
}