In Kotlin, variable declarations look a bit different than Java’s:

val i : Int = 42

• They start with either val or var, making the declaration final (”value”) or variable.
• The type is noted after the name, separated by a :
• Thanks to Kotlin’s type inference the explicit type declaration can be obmitted if there is an assignment with a type the compiler is able to unambigously detect

Java | Kotlin | —— | —— |int i = 42; | var i = 42 (or var i : Int = 42) |final int i = 42; | val i = 42 |