键值对矩阵/字典

# 创建字典
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}

# 访问值
print(my_dict['name'])  # 输出: Alice

# 添加新键值对
my_dict['job'] = 'Engineer'

# 删除键值对
del my_dict['city']

# 遍历字典
for key, value in my_dict.items():
    print(key, value)

// 创建对象
let myObj = {name: 'Alice', age: 25, city: 'New York'};

// 访问值
console.log(myObj.name);  // 输出: Alice

// 添加新属性
myObj.job = 'Engineer';

// 删除属性
delete myObj.city;

// 遍历对象
for (let key in myObj) {
    console.log(key, myObj[key]);
}

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

public class Main {
    public static void main(String[] args) {
        // 创建映射
        Map<String, Object> myMap = new HashMap<>();
        myMap.put("name", "Alice");
        myMap.put("age", 25);
        myMap.put("city", "New York");

        // 访问值
        System.out.println(myMap.get("name"));  // 输出: Alice

        // 添加新键值对
        myMap.put("job", "Engineer");

        // 删除键值对
        myMap.remove("city");

        // 遍历映射
        for (Map.Entry<String, Object> entry : myMap.entrySet()) {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }
    }
}