How to access static variable of java class in kotlin?

Question

Eg: I have a java class First

First.java

   `class First{
      public static TAG = "test"
    }`

Second.kt

  `class Second{
     First.TAG  /*Error classifier First does not have a companion object,and thus must be initialized here*/
   }`

So help me to call the static variable TAG declared in First.java inside Second.kt kotlin class

as a side note it should be public static String TAG you are missing String — Manohar
– Manohar, Commented Jul 18, 2018 at 9:32
use full qualified name instead of First.TAG use <your package>.First.TAG kotlinlang.org/docs/reference/java-interop.html — Rahul
– Rahul, Commented Jul 18, 2018 at 9:32
Why would you do that? it's not clear what you are trying to do with First.TAG . If you want to create a member variable var someMember = First.TAG and why does TAG not have a type in your java class. I am guessing it's a String — Dracarys
– Dracarys, Commented Jul 18, 2018 at 9:33
Also in Kotlin you can use Companion object, just like static methods in Java. — Mete
– Mete, Commented Jul 18, 2018 at 10:38

score 3 · Accepted Answer · 2018-07-18 10:27:20Z

3

Java Class:

class First {
    public static String TAG = "test";
}

Kotlin Class:

class Second {
    val secondTag: String = First.TAG
}

and there is no problem.

Try with IntelliJ IDEA

fun main(args: Array < String > ) {
    val s = Second()
    println(s.secondTag)
}

prints test

edited Jul 18, 2018 at 10:27

answered Jul 18, 2018 at 10:21

user8959091

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Comments

EpicPandaForce · Accepted Answer · 2018-07-19 23:24:08Z

1

Just make a proper, static final constant.

class First {
      public static final String TAG = "test"
}

Now you can call it from Kotlin.

class Second {
   fun blah() {
       val tag = First.TAG
   }
}

answered Jul 19, 2018 at 23:24

EpicPandaForce

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Comments

Roberto Capah · Accepted Answer · 2019-10-16 06:50:58Z

0

First Class

package com.your.package object First { val TAG: String= "Your TAG"; }

Second Class

class Second{ First.TAG }

Kotlin doesn’t have static members or member functions, you can use companion object

answered Oct 16, 2019 at 6:50

Roberto Capah

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