如何将扁平化的LinkedHashMap转换为表示层次结构的one

import java.util.LinkedHashMap;
import java.util.Map;

public class FlattenToHierarchy {
    public static void main(String[] args) {
        LinkedHashMap<String, String> flatMap = new LinkedHashMap<>();
        flatMap.put("A", "1");
        flatMap.put("A.B", "2");
        flatMap.put("A.B.C", "3");
        flatMap.put("A.D", "4");
        flatMap.put("E", "5");

        Map<String, Object> hierarchyMap = new LinkedHashMap<>();
        for (Map.Entry<String, String> entry : flatMap.entrySet()) {
            addToHierarchy(hierarchyMap, entry.getKey(), entry.getValue());
        }

        System.out.println(hierarchyMap);
    }

    private static void addToHierarchy(Map<String, Object> hierarchyMap, String key, String value) {
        String[] parts = key.split("\\.");
        Map<String, Object> currentMap = hierarchyMap;
        for (int i = 0; i < parts.length - 1; i++) {
            String part = parts[i];
            if (!currentMap.containsKey(part)) {
                currentMap.put(part, new LinkedHashMap<String, Object>());
            }
            currentMap = (Map<String, Object>) currentMap.get(part);
        }
        currentMap.put(parts[parts.length - 1], value);
    }
}