Kontln的属性形式Getter和Setter

package loaderman.demo

class Person {

    val name: String
        get() = "name"
    var v: Int = 0

    var value: Int
        get() = v
        set(value) {
            println("设值" + value)
            v = value
        }

}

package loaderman

import loaderman.demo.Person

fun main(arg: Array<String>) {
    var p = Person()
    println( p.v)
    p.value=80
    println( p.v)
}

filed标识符，可以将filed 当作成员变量使用，也就是通过field读写属性值

package loaderman.demo

class Person {

    val name: String
        get() = "name"

    var value: Int=0
        get() =field
        set(value) {
            println("设值" + value)
            field = value
        }

}

package loaderman

import loaderman.demo.Person

fun main(arg: Array<String>) {
    var p = Person()

    p.value=80
    println( p.value)
}