Java -以递归方式获取映射的所有键

import java.util.*;

public class RecursiveMapKeys {
    public static void main(String[] args) {
        // 创建一个示例映射
        Map<String, Object> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");
        Map<String, Object> nestedMap = new HashMap<>();
        nestedMap.put("nestedKey1", "nestedValue1");
        nestedMap.put("nestedKey2", "nestedValue2");
        map.put("nestedMap", nestedMap);

        // 调用递归方法获取所有键
        Set<String> keys = getAllKeys(map);

        // 打印所有键
        for (String key : keys) {
            System.out.println(key);
        }
    }

    public static Set<String> getAllKeys(Map<String, Object> map) {
        Set<String> keys = new HashSet<>();

        for (String key : map.keySet()) {
            keys.add(key);
            if (map.get(key) instanceof Map) {
                keys.addAll(getAllKeys((Map<String, Object>) map.get(key)));
            }
        }

        return keys;
    }
}

key1
key2
nestedMap
nestedKey1
nestedKey2