My Solution
close the IDE and restart
full pulish the project
推荐阅读:tomcat/Jboss启动ClassNotFoundException问题思考
https://blog.csdn.net/zxysshgood/article/details/80311100
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2299. Strong Password Checker II
points:
String to stream: String.chars(), it will return a IntStream
anyMatch(Predicate)/AllMatch(Predicate)
String.contains(CharSequence)
String.indexOf(int ch), return -1 when not found.
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Problem
GROUP_CONCAT can not get complete data from DB
Reason
Default limit length of GROUP_CONCAT: 1024
Solution
SET SESSION group_concat_max_len=102400; SET GLOBAL group_concat_max_len=102400;
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[TOC]
第一章Working with Java Data Types
1.java变量命名规则
https://www.cnblogs.com/Yuakk/p/14349555.html
对于java变量的规则,开头不能是数字,且不能只是单一符号,且不能是关键词,但是可以包含关键词。关键词区分大写小写,比如
int new; // 不可以,非法
int NEW; // 可以,合法
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HTML Tag Fliter
Sometimes we would like to deleted some HTML-tags in a email(if we use html tag in our email.), to avoid hacker attack or something else.
We can use org.jsoup.safety.Whitelist to achieve it.
Documentation: https://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html
usage:
addAttributes(String tag, String... attributes)
Add a list of allowed attributes to a tag.
addAttributes("a", "href")
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[TOC]
This is a practice project, currently only in Chinese, and the English version will be added later.
The project is developed on the basis of Spring boot, MySQL, MyBatis...
28.11.2020 index site
On this page, posts made by users will be displayed. In addition, the user's avatar, username, publishing time, etc. will be displayed. If the post is marked as essential or top, it will be displayed.
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[TOC]
高频算法题
https://www.nowcoder.com/discuss/577995?type=2&order=3&pos=2&page=1&channel=-1&source_id=discuss_tag_nctrack
牛客 Tree IV
什么是完全二叉树
1.铺完一层才能铺一下层,且必须从左到右
2.每一层都是等差数列(如果节点按顺序添加)
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Set the sum of Columns
Problem
SUM function only sums results from current page!
Solution
change the Reset type "Column" to "Report"
other Problem
If you were to use the methods above, and the problem would not have been solved.
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在德国找Werksudent(Hiwi)攻略info篇
===
## 目录
[TOC]
## 序言
本攻略目前只提供给**计算机学科以及相近学科**的同学进行参考,其他专业的学生并不完全适合本攻略。能力强的同学也不需要看这篇攻略。
随着学习计算机专业的学生越来越多,竞争愈发变大,如果能够在读书期间获得实习经验,这将会是未来求职生涯中的大筹码,并且起点工资,起点公司也会比没有任何经验的同学高上不少。国内大牛可都是从大一开始实习的,幸运的是,德国的hiwi制度也给了我们不那么困难就能成为小牛的机会,并且即可以兼顾留学生涯中大学学习,也能在毕业时获得工作经验。
攻略旨在为大家整理一个完整的在德国找hiwi的流程。内容包括但不限于**如何找到招聘广告或职位信息,如何满足职位需求,如何写简历,如何写Anschreiben,面试过程中,会问到哪些问题,以及应对心得等。**
希望各位同学能够通过此攻略找到适合自己的工作。
## 什么是Werkstudent
---
概念:
Als Werkstudent werden Studenten bezeichnet, die neben d
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