[Kotlin] java static method 코틀린 문법

자바 :

class Foo {
  public static int a() { return 1; }
}

코틀린 :

class Foo {
  companion object {
     fun a() : Int = 1
  }
}

 

From the docs:

https://kotlinlang.org/docs/reference/object-declarations.html#companion-objects

Companion Objects

An object declaration inside a class can be marked with the companion keyword:

class MyClass {
   companion object Factory {
       fun create(): MyClass = MyClass()
   }
}

Members of the companion object can be called by using simply the class name as the qualifier:

val instance = MyClass.create()

 

However, on the JVM you can have members of companion objects generated as real static methods and fields, if you use the @JvmStatic annotation. See the Java interoperability section for more details.