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今天用SecureCRT远程连接Linux（Centos7）时，连不上，报错Theremotesystemrefusedtheconnection.于是就百度，首先查看sshd服务有没有启动!(http://q1pqt7tv2.bkt.clouddn.com/Fjh81Qs2Or06UIhhq9lYHemDUqZv)只有s

1.选择语言个人推荐English!(https://oscimg.oschina.net/oscnet/42b23f71bdd6e887fbd451c7bbada175ca9.png)2.选择第一项InstallUbuntuServer!(https://oscimg.oschina.net/oscnet/225438873a50

!(https://oscimg.oschina.net/oscnet/up0b8d4b9e5e3854503a73fd494cd4b53d984.JPEG)引子：段错误与内存安全在刚开始接触Rust的时候，我们就提过Rust语言的定位：Rustisasystem'sprogramminglanguagethatr

官方的yum源在国内访问效果不佳。需要改为国内比较好的阿里云或者网易的yum源修改方式：!复制代码(https://oscimg.oschina.net/oscnet/a02dff18a0a682c46ab7279071babde9bbd.gif)下载wgetyuminstallwgetyecho备份

!Java大法好(https://uploadimages.jianshu.io/upload_images/9824247ebde9aba31e55d24.png?imageMogr2/autoorient/strip%7CimageView2/2/w/1240)写在前面看到JDK12又发布了，萌新不知不觉感觉

单表查询前期准备!(https://oscimg.oschina.net/oscnet/db552e88b7d23aaadceffa6c4d457fa4675.jpg)!(https://oscimg.oschina.net/oscnet/a493c3ac3fbc3ab33958ec9a532850186a1.jpg)c

!(https://oscimg.oschina.net/oscnet/1e9f616852f14e3bb3336adb2b2f6d16.gif)Docker基础与实战，看这一篇就够了!(https://oscimg.oschina.net/oscnet/a21a569a11974fcd8173

图：模块化手机概念一、什么是Java模块化Java模块化（module）是Java9及以后版本引入的新特性。官方对模块的定义为：一个被命名的，代码和数据的自描述集合。（themodule,whichisanamed,selfdescribingcollec