How to set the value of property in Kotlin

Question

I have tried to set a property value as in the following snippet.This SO question is not answering the question.

var person = Person("john", 24)
        //sample_text.text = person.getName() + person.getAge()
        var kon = person.someProperty
        person.someProperty = "crap" //this doesn't allow me to set value
        kon = "manulilated"  //this allows me to set the value
        sample_text.text = kon

class Person(val n: String, val a: Int){
    var pname: String = n
    var page: Int = a

    var someProperty: String = "defaultValue"
        get() = field.capitalize()
        private set(value){field = value}
    fun Init(nm: String, ag: Int){
        pname = nm
        page = ag
    }

    fun getAge(): Int{
        return page
    }

    fun getName(): String{
        return pname
    }
}

Why was I able to set the value of the Person class on the second line but not the first line?

Answer 1

First, the private modifier is your problem.

Change

private set(value){field = value}

To

set(value){field = value}
//public by default

Otherwise you can’t use the setter outside the class. Read here.

For members declared inside a class: private means visible inside this class only (including all its members);

Second, you’re misunderstanding something:

 var kon = person.someProperty
 kon = "manulilated" 

In these lines you’re not changing the property in the object. After creating the variable kon, being a String pointing to someProperty, you reassign that local variable to something else. This reassignment is unequal to changing the value of person.someProperty! It has totally no effect in the object.