KFoo.kt

object KFoo {
	private data class Person internal constructor(val age: Int, val name: String)

	@JvmStatic fun main(args: Array<String>) {
		val people = mutableListOf(
				Person(20, "A"),
				Person(18, "B"),
				Person(22, "C")
		)
		people.sortBy { it.age }
		println(people)
	}
}