Daily Kotlin - getter, setter

• normal getter, setter

코틀린은 getter와 setter를 자동 생성해주기 때문에 필요 없다.

package chap06.section1

class User(_id: Int, _name: String, _age: Int) {
    val id: Int = _id
        get() = field
    
    var name: String = _name
        get() = field
        set(value) {
            field = value
        }
    
    var age: Int = _age
        get() = field
        set(value) {
            field = value
        }
}

fun main() {
    val user1 = User(1, "Kildong", 30)
    user1.age = 35
    println("user1.age = ${user1.age}")
}

• custom getter setter

package chap06.section1

class newUser(_id: Int, _name: String, _age: Int) {
    val id: Int = _id
    var name: String = _name
        set(value) {
            println("The name was changed")
            field = value.toUpperCase()
        }
    var age: Int = _age
}

fun main() {
    val user1 = newUser(1, "kildong", 30)
    user1.name = "coco"
    println("new user name = ${user1.name}")
}

The name was changed
new user name = COCO

• getter, setter 예제

나이를 속여보자. 18세 미만은 18세로. 18세 이상~30세 이하는 유지. 30세 초과는 3살 낮춰서