Use gson to parse integer array

KotlinGson.java

package com.foo;

import java.util.Arrays;
import java.util.List;

import com.google.gson.Gson;

public class KotlinGson {

    private static List<Integer> toList(String json, Gson parser) {
        return parser.fromJson(json, List.class);
    }

    private static int[] toArray(String json, Gson parser) {
        return parser.fromJson(json, int[].class);
    }

    public static void main(String[] args) {
        String json = new String("[1, 2, 3, 4]");
        Gson parser = new Gson();

        int[] arr = toArray(json, parser);
        System.out.println(Arrays.toString(arr)); // prints [1, 2, 3, 4]

        List<Integer> list = toList(json, parser);// prints [1.0, 2.0, 3.0, 4.0], not integer values
        System.out.println(list.toString());
    }
}