kotlin get() 与 set()

class Person {

var name: String = "John Doe"

get() {

println("Getting the name: $field")

return field

}

set(value) {

println("Setting the name to: $value")

field = value

}

var age: Int = 0
    get() {
        println("Getting the age: $field")
        return field
    }
    set(value) {
        if (value >= 0) {
            println("Setting the age to: $value")
            field = value
        } else {
            println("Age cannot be negative")
        }
    }

}

fun main() {

val person = Person()

person.name = "Alice"
println(person.name)

person.age = 25
println(person.age)

person.age = -5

}