How to use a variable from another class in Kotlin?

Question

I just have a (hopefully) simple question. How do I make a variable in one class that can be accessed by another class in Kotlin?

Class A:

var isBlue = 1

Class B:

if isBlue==1 then ...

You need to reference an instance of the other class and use . dot notation to access its properties. someInstanceOfA.isBlue == 1. — Tenfour04
– Tenfour04, Commented Dec 3, 2019 at 16:42
I'm guessing you are very new to OOP? Please post the code you wrote so far! — Christoph Grimmer
– Christoph Grimmer, Commented Dec 3, 2019 at 16:42
I have no written code yet. I am just trying to make some sort of switch that determines which functions I'm gonna run in the other class. — user12475206
– user12475206, Commented Dec 3, 2019 at 16:52

GHH · Accepted Answer · 2019-12-03 17:32:58Z

11

class A

class A {
    var isBlue = 1
}

class B

class B {

    var classA = A()

    fun demo(){

        classA.isBlue//get A member
    }
}

hope this helps.

answered Dec 3, 2019 at 17:32

GHH

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Comments

Ukesh Shrestha · Accepted Answer · 2019-12-03 17:35:06Z

2

you can either create an instance of the object and access the property like this

ClassA().isBlue

or inherit the class and access the attribute like this.

ClassB:ClassA{ fun someFn(){if (isBlue == 1) do something}}

answered Dec 3, 2019 at 17:35

Ukesh Shrestha

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Comments

Aung Phyo Zaw · Accepted Answer · 2020-10-25 04:29:56Z

0

In java , just declare with " static " , no need to call class name , in Kotlin need to call class name , but null pointer exception , Such headache problem

answered Oct 25, 2020 at 4:29

Aung Phyo Zaw

1

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