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A. Old Java Way :

1. Declare a companion object to enclose a static method / variable

    class Foo{ companion object { fun foo() = println("Foo") val bar ="bar" } } 

2. Use :

    Foo.foo() // Outputs Foo println(Foo.bar) // Outputs bar 

B. New Kotlin way

1. Declare directly on file without class on a .kt file.

    fun foo() = println("Foo") val bar ="bar" 

2. Use the methods/variables with their names. (After importing them)

   Use :

    foo() // Outputs Foo println(bar) // Outputs bar