编辑代码

data class Recipe(val title:String,val isVegetarian:Boolean)

fun main(args : Array<String>){
    println("Hello world!     -  kotlin.jsrun.net")
    var r1 = Recipe("Thai Curry",false)
    var r2 = Recipe("Thai Curry",false)
    var r3 = r1.copy(title="Chicke Bhuna")
    println("r1.hashcode:${r1.hashCode()}")
    println("r2.hashcode:${r2.hashCode()}")
    println("r3.hashcode:${r3.hashCode()}")
    println("r1 toString is ${r1.toString()}")
    println("r1 == r2? ${r1==r2}")
    println("r1===r2? ${r1===r2}")
    println("r1==r3? ${r1 == r3}")
    val(title,vegetarian)=r3
    println("title is $title,vegetarian is $vegetarian")
}