如何动态创建关联数组

// 创建一个空对象
let associativeArray = {};

// 添加键值对
associativeArray["key1"] = "value1";
associativeArray["key2"] = "value2";

// 访问键值对
console.log(associativeArray["key1"]); // 输出 "value1"
console.log(associativeArray["key2"]); // 输出 "value2"

# 创建一个空字典
associative_array = {}

# 添加键值对
associative_array["key1"] = "value1"
associative_array["key2"] = "value2"

# 访问键值对
print(associative_array["key1"])  # 输出 "value1"
print(associative_array["key2"])  # 输出 "value2"

<?php
// 创建一个空数组
$associativeArray = array();

// 添加键值对
$associativeArray["key1"] = "value1";
$associativeArray["key2"] = "value2";

// 访问键值对
echo $associativeArray["key1"]; // 输出 "value1"
echo $associativeArray["key2"]; // 输出 "value2"
?>

import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // 创建一个空的 HashMap
        Map<String, String> associativeArray = new HashMap<>();

        // 添加键值对
        associativeArray.put("key1", "value1");
        associativeArray.put("key2", "value2");

        // 访问键值对
        System.out.println(associativeArray.get("key1")); // 输出 "value1"
        System.out.println(associativeArray.get("key2")); // 输出 "value2"
    }
}