data class数据类

    • toString()
    • hashCode()
    • copy()
    • component1() 第一个参数
    • component2() 第二个参数
    1. @PoKo
    2. data class Country(val id: Int, val name: String)
    4. class ComponentX{
    5.     operator fun component1(): String{
    6.         return "您好，我是"
    7.     }
    9.     operator fun component2(): Int{
    10.         return 1
    11.     }
    13.     operator fun component3(): Int{
    14.         return 1
    15.     }
    17.     operator fun component4(): Int{
    18.         return 0
    19.     }
    20. }
    22. fun main(args: Array<String>) {
    23.     val china = Country(0, "中国")
    24.     println(china)
    25.     println(china.component1())
    26.     println(china.component2())
    27.     val (id, name) = china
    28.     println(id)
    29.     println(name)
    31.     val componentX = ComponentX()
    32.     val (a, b, c, d) = componentX
    33.     println("$a $b$c$d")
    34. }