Java将Tuple4s列表转换为嵌套映射

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

public Map<String, Map<String, Map<String, String>>> convertToNestedMap(List<Tuple4<String, String, String, String>> tupleList) {
    return tupleList.stream()
            .collect(Collectors.groupingBy(Tuple4::getFirst, // 第一层映射的键
                    Collectors.groupingBy(Tuple4::getSecond, // 第二层映射的键
                            Collectors.toMap(Tuple4::getThird, Tuple4::getFourth)))); // 第三层映射的键值对
}

List<Tuple4<String, String, String, String>> tupleList = new ArrayList<>();
// 添加Tuple4s到列表中

Map<String, Map<String, Map<String, String>>> nestedMap = convertToNestedMap(tupleList);