将字典转换为保存字典键的数组

my_dict = {'key1': 1, 'key2': 2, 'key3': 3}
keys_array = list(my_dict.keys())
print(keys_array)

['key1', 'key2', 'key3']

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Map<String, Integer> myMap = new HashMap<>();
        myMap.put("key1", 1);
        myMap.put("key2", 2);
        myMap.put("key3", 3);
        
        String[] keysArray = myMap.keySet().toArray(new String[0]);
        System.out.println(Arrays.toString(keysArray));
    }
}

[key1, key2, key3]

const myDict = {'key1': 1, 'key2': 2, 'key3': 3};
const keysArray = Object.keys(myDict);
console.log(keysArray);

['key1', 'key2', 'key3']

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        Dictionary<string, int> myDict = new Dictionary<string, int>()
        {
            {"key1", 1},
            {"key2", 2},
            {"key3", 3}
        };

        string[] keysArray = new List<string>(myDict.Keys).ToArray();
        Console.WriteLine(string.Join(", ", keysArray));
    }
}

key1, key2, key3