主页 / coding / 问题 / 76933239
Accepted
ryhanhxx
Asked: 2023-08-19 09:14:29 +0800 CST

如何从 Kotlin 列表中获取特定索引号

  • 772
data class foodInfo(
    val name: String,
    val price: Int
)

class Foods {
    private val food = mutableListOf(
        foodInfo("Pizza", 50000),
        foodInfo("Burger", 40000),
        foodInfo("Fried Rice", 40000),
        foodInfo("Noodle", 15000),
        foodInfo("Salad", 5000)
    )

    fun displayMenu() {
        food.forEachIndexed { index, foodInfo ->
            println("${index + 1}. ${foodInfo.name} =  ${foodInfo.price}/porsi")
        }
    }

    fun foodSelected(index: Int){
       val getIndex = food[index]
       println("You pick a number $getIndex")
    }
}

fun main(){
    Foods().displayMenu()
    print("Pick Menu: ")
    
    val selectMenu = readln().toInt()
    Foods().foodSelected(selectMenu)

}

如何从食品列表中获取具体的索引号、名称和价格？

我已经尝试过，但我得到了像这样的完整对象 foodInfo(name=Pizza, Price=50000)

function

1 个回答

  1. Best Answer
    data class foodInfo(
    val name: String,
    val price: Int
)

class Foods {
    private val food = mutableListOf(
        foodInfo("Pizza", 50000),
        foodInfo("Burger", 40000),
        foodInfo("Fried Rice", 40000),
        foodInfo("Noodle", 15000),
        foodInfo("Salad", 5000)
    )
    fun foodSelected(index: Int){
       val getIndex = food[index]
       println("You pick a number $index $getIndex") // Add the index parameter here
    }
}

fun main(){
    Foods().displayMenu()
    print("Pick Menu: ")
    
    val selectMenu = readln().toInt()
    Foods().foodSelected(selectMenu)

}

    据我理解你的问题，这可能是打印该项目的索引的可能性

    由于列表使用基于 0 的索引，index+1因此可以帮助您打印准确的索引。我刚刚为你提供了正确方向的提示

    • -1

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