java递归组织结构 java简单递归

//调用
List<Map<String,Object>> list = new ArrayList<>();
for (int i = 0; i < depList.size(); i++) {
    Map<String,Object> map = new HashMap<>();
    map.put("id",depList.get(i).getId());
    map.put("pId",depList.get(i).getFid());
    map.put("name",depList.get(i).getCnatureClassName());
    list.add(map);
}
List<Map<String, Object>> child = getChild(list, "0");

//递归
public List<Map<String,Object>> getChild(List<Map<String,Object>> lawList, String pId){
    List<Map<String,Object>> childList = new ArrayList<>();
    for (Map<String,Object> m : lawList) {
        if(m.get("pId").equals(pId)){
            //说明是子类
            childList.add(m);
        }
    }
    // 把子菜单的子菜单再循环一遍
    for (Map<String,Object> m: childList) {
        // 递归
        m.put("child",getChild(lawList,String.valueOf(m.get("id"))));
    } 
    // 递归退出条件
    if (childList.size() == 0) {
        List<Map<String,Object>> list = new ArrayList<>();
        return list;
    }
    return childList;
}