有bug的程序

	private int mStdId;

//leaf 0 是根  1是叶子
	private boolean[] aryNodeStatus = new boolean[100];
	private List<CourseIsBuy> ListBuyTree = new ArrayList<CourseIsBuy>();

	public void CreateCourseBuyRec(Course cs, boolean isBuy, boolean isRoot) {
		CourseIsBuy ss = new CourseIsBuy();


		ss.setCs(cs);
		ss.setIsBuyed(isBuy);
		ss.setIsRootCourse(isRoot);
System.out.println(ss.getCs().getCname()+"   isbuy:"+ss.isIsBuyed());
		ListBuyTree.add(ss);

	}

	public List<CourseIsBuy> findTreeForBuy(int stdId) {
		mStdId = stdId;
		ListBuyTree.clear();

		List<Course> list = (List<Course>) stdCourseDao.findStdCourseByPid(0);
		if(list==null) return ListBuyTree;
		for (Course course : list) {
			//不是叶子
			//0是叶子 1非叶子
			if (course.getLeaf().equals("1")) {



				boolean bIsBuy = stdCourseDao.findStdCourseByScId(stdId,
						course.getCid());


				CreateCourseBuyRec(course, bIsBuy, bIsBuy);

				aryNodeStatus[0] = true;

				this.treeBuy(course.getCid(), 0, aryNodeStatus, bIsBuy);
			} else {


				boolean bIsBuy = stdCourseDao.findStdCourseByScId(stdId,
						course.getCid());



				CreateCourseBuyRec(course, bIsBuy, false);
			}
		}


		return ListBuyTree;
	}

	/**
	 * function :找到整个树并找到已购的课程
	 * 
	 * @param:
	 */
	private void treeBuy(Integer cid, Integer level, boolean[] aryIsLastNode,
			boolean isBuyFlag) {
		int index = 0;

		List<Course> list = (List<Course>) stdCourseDao.findStdCourseByPid(cid);
		 if (list==null) return;  

		for (Course course : list) {

			String symbol = "";
			String symbolf = "　";
			index++;

			// 先画上级节点延续下来的"|"+空格，空格具体数目由层数决定

			for (int lev = 0; lev < level; lev++) {
				if (aryIsLastNode[lev] == false)
					symbolf += "│　";
				else
					symbolf += "  　";
			}
			// 是否为最后一个节点
			if (index == list.size()) {
				symbol = "└";

			} else {
				symbol = "├";

			}
			String cname = symbolf + symbol + course.getCname();


			course.setCname(cname);

			boolean bIsBuy = false;
			if (course.getLeaf().equals("0")) {

				// 判断一下他的上级是否已经是被购买了
				//Course cs, boolean isBuy, boolean isRoot
				//isBuyFlag false
				if (!isBuyFlag) {	
					bIsBuy = stdCourseDao.findStdCourseByScId(mStdId,
							course.getCid());
					CreateCourseBuyRec(course, bIsBuy, bIsBuy);

					isBuyFlag = bIsBuy;
				}else{
					CreateCourseBuyRec(course, true, false);
				}
			} else {

				// 判断一下他的上级是否已经是被购买了
				//!isBuyFlag==true 上级没被购买      isBuyFlag==false上级被购买
				if (!isBuyFlag) {
					//不显示横线
					//这里上级没被购买
					bIsBuy = stdCourseDao.findStdCourseByScId(mStdId,
							course.getCid());

					CreateCourseBuyRec(course, bIsBuy, bIsBuy);
					isBuyFlag = bIsBuy;

				} else {
					//显示横线
					CreateCourseBuyRec(course, true, false);
				}
				course.setLevel(level + 1);
				if (index == list.size()) {
					aryIsLastNode[level] = true;
				} else {
					aryIsLastNode[level] = false;
				}
				treeBuy(course.getCid(), course.getLevel(), aryIsLastNode,
						isBuyFlag);
			}
		}

	}