使用streams从Json创建嵌套地图

import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class JsonToNestedMapExample {
    public static void main(String[] args) {
        // 假设这是从Json解析得到的Java对象
        Map<String, Object> json = Map.of(
                "name", "John",
                "age", 30,
                "address", Map.of(
                        "city", "New York",
                        "country", "USA"
                )
        );

        // 使用Streams创建嵌套地图
        Map<String, Object> nestedMap = json.entrySet().stream()
                .collect(Collectors.toMap(
                        Map.Entry::getKey,
                        entry -> entry.getValue() instanceof Map ?
                                convertToNestedMap((Map<String, Object>) entry.getValue()) :
                                entry.getValue()
                ));

        // 打印嵌套地图
        System.out.println(nestedMap);
    }

    private static Map<String, Object> convertToNestedMap(Map<String, Object> map) {
        return map.entrySet().stream()
                .collect(Collectors.toMap(
                        Map.Entry::getKey,
                        entry -> entry.getValue() instanceof Map ?
                                convertToNestedMap((Map<String, Object>) entry.getValue()) :
                                entry.getValue()
                ));
    }
}