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@nimani76

kotlinでHashMapの実装

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HashMap

HashMapをkotlinで実装した。
idがkeyで名前がvalue

maptest.kt

import java.util.Scanner
import java.util.InputMismatchException

var map = kotlin.collections.HashMap<Int , String>()

fun main(arg : Array<String>) {
    val input = Scanner(System.`in`)
    var i : Int
    try {
    loop@ while(true) {
            println("何をしますか?\n" +
                    "入力 =>1" + "表示=>2" + "探す=>3" + "削除=>4"+ "終了=>5")
            i = input.nextInt()
            when (i) {
                1 -> {
                    Scan()
                }
                2 -> {
                    println(map)
                }
                3 -> {
                    search()
                }
                4 -> {
                    delete()
                }
                5->{
                    break@loop
                }
            }
    }
    }catch(e : InputMismatchException){
        println("型が違います : " +e)
    }
}

map.kt
import java.util.*
val input = Scanner(System.`in`)

fun search(){
    val key : Int
    println("idを入力してください")
    try {
        key = input.nextInt()
        if (map.containsKey(key)) {
            println("$key =" + map.get(key))
        } else {
            println("そのidは存在しません")
        }
    }catch (e : InputMismatchException){
        println("型が違います : ")
    }
}
fun Scan(){
    println("名前を入力してください")
    val name =  input.next()
    println("idを入力してください")
    val key : Int = input.nextInt()
    try {
        if (map.containsKey(key)) {
            println("上書きしますか?\n" +
                    "はい=>1いいえ=>2")
            when (input.nextInt()) {
                1 -> {
                    map.put(key, name)
                }
                2 -> {
                }
            }
        } else {
            map.put(key, name)
        }
    }
    catch (e : InputMismatchException){
        println("型が違います : ")
    }
}
fun delete() {
    println("全削除=>1 1データ削除=>2 キャンセル=>3")
    try {
        when (input.nextInt()) {
            1 -> {
                map.clear()
            }
            2 -> {
                println("削除するidを入力してください")
                val keyid: Int = input.nextInt()
                map.remove(keyid)
            }
            3 -> {
            }
        }
    }catch (e : InputMismatchException){
        println("型が違います : ")
    }
}


名前を日本語で入力やリトライなどの実装はまたこんど。

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