How to use Companion object in the main class

Question

in the below 2 posted examples, i am trying to convert the java code to kotlin code.

the kotlin code does not work and IntelliJ says that I should use companion object.

please let me know how to correct this error.

code_kotlin*

 @SpringBootApplication
 class MyApplication {
 }

 fun main(args: Array<String>) {
 SpringApplication.run(MyApplication::class.java, *args)
 }

codeJava

 @SpringBootApplication
 public class MyApplication {  
 public static void main(String[] args) {
    SpringApplication.run(MyApplication.class, args);
 }       
 }

What exactly does not work? – Alexey Romanov Jul 15 '19 at 16:48 — Alexey Romanov, Jul 15 '19 at 16:48

score 0 · Answer 1 · answered Jul 15 '19 at 06:59

0

Include main function inside Application class, as Java code does:

 @SpringBootApplication
 class MyApplication {

   fun main(args: Array<String>) {
     SpringApplication.run(MyApplication::class.java, *args)
   }

}

answered Jul 15 '19 at 06:59

S-Sh

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score 0 · Answer 2 · answered Jul 15 '19 at 07:01

Unlike Java or C#, Kotlin doesn’t have static members or member functions. Kotlin recommends to simply use package-level functions instead. For more detail you can get help from link. You can call companion object like-

class YourClassName{

    companion object {
         //write what you want to make static
    }  
}

How to use Companion object in the main class

2 Answers2