怎么用java代码实现上面这样的目录树? 首先创建数据表 每条数据记录自己的id以及父节点的id 然后进入java代码部分: public String directory(String author) { StringBuffer treeHtml = new StringBuffer(); // 得到所有的目录词(包含全部字段) List<Tutorial> words = bdExpandService.getAllWords(author); for (int i = 0; i <
本文介绍两种不同生成多级目录树的方式:1. 递归生成,2. map+list 集合生成.最下方会附上完整代码. 生成树的基本规则:子节点的par_id等于父节点的id. 1. 实体类 import java.util.ArrayList; public class Menu { private int id; private String menuName;//名称 private int parId;//上级ID private int type;//0:目录:1:菜单 private St
JDK 对线程组类注释: A thread group represents a set of threads. In addition, a thread group can also include other thread groups. The thread groups form a tree in which every thread group except the initial thread group has a parent.A thread is allowed to a
#先看源码 def walk(top, topdown=True, onerror=None, followlinks=False): """Directory tree generator. For each directory in the directory tree rooted at top (including top itself, but excluding '.' and '..'), yields a 3-tuple dirpath, dirnames,