Hands-On Object-Oriented Programming with Kotlin

The enum class and functions

Just as the enum class can have a property, it can also have a function. Let's create an application in which we can store the land area of different states:

enum class US (val totalArea : Double, val landArea : Double) {    NEWYORK     (141_297.0,  122_057.0),    VIRGINIA    (110_787.0, 102_279.0) ,    HAWAII      (28_313.0,    16_635.0),    NEWJERSEY   (22_591.0, 19_047.0) ;     fun getWaterArea() = totalArea - landArea }

Although we don't often use semicolons in Kotlin, we do need to place a semicolon at the end of a list when the enum class contains a constructor with more than one property. enum class US contains different states, each of which contain information about the land and total area. The enum class contains the getWaterArea ...