[JAVA] Implementation of HashMap in kotlin

HashMap I implemented HashMap with kotlin. id is key and name is 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("What are you doing?\n" +
                    "input=>1" + "display=>2" + "look for=>3" + "Delete=>4"+ "End=>5")
            i = input.nextInt()
            when (i) {
                1 -> {
                    Scan()
                }
                2 -> {
                    println(map)
                }
                3 -> {
                    search()
                }
                4 -> {
                    delete()
                }
                5->{
                    break@loop
                }
            }
    }
    }catch(e : InputMismatchException){
        println("The type is different: " +e)
    }
}

map.kt

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

fun search(){
    val key : Int
    println("Please enter id")
    try {
        key = input.nextInt()
        if (map.containsKey(key)) {
            println("$key =" + map.get(key))
        } else {
            println("That id does not exist")
        }
    }catch (e : InputMismatchException){
        println("The type is different: ")
    }
}
fun Scan(){
    println("Please enter your name")
    val name =  input.next()
    println("Please enter id")
    val key : Int = input.nextInt()
    try {
        if (map.containsKey(key)) {
            println("Do you want to overwrite?\n" +
                    "Yes=>1 No=>2")
            when (input.nextInt()) {
                1 -> {
                    map.put(key, name)
                }
                2 -> {
                }
            }
        } else {
            map.put(key, name)
        }
    }
    catch (e : InputMismatchException){
        println("The type is different: ")
    }
}
fun delete() {
    println("Delete all=>1 1 Delete data=>2 Cancel=>3")
    try {
        when (input.nextInt()) {
            1 -> {
                map.clear()
            }
            2 -> {
                println("Please enter the id to delete")
                val keyid: Int = input.nextInt()
                map.remove(keyid)
            }
            3 -> {
            }
        }
    }catch (e : InputMismatchException){
        println("The type is different: ")
    }
}

The implementation such as inputting the name in Japanese and retrying is coming again.