# 很好的问题

- [java判断空值](https://stackoverflow.com/questions/271526/avoiding-nullpointerexception-in-java?page=1&tab=votes#tab-top)
- [获取堆栈信息](https://stackoverflow.com/questions/1069066/how-can-i-get-the-current-stack-trace-in-java)
- [从文件读取字符串](https://stackoverflow.com/questions/326390/how-do-i-create-a-java-string-from-the-contents-of-a-file)
- [打包jar](https://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven)
- [random怪异现象](https://stackoverflow.com/questions/15182496/why-does-this-code-using-random-strings-print-hello-world)
- [@component和@configuration区别](https://juejin.cn/post/6873314485449261069)