<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[Shawn_RJF的博客]]></title><description><![CDATA[不积跬步无以至千里，不及小流无以成江海]]></description><link>https://blog.youkuaiyun.com/rjf666</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; rjf666]]></copyright><item><title><![CDATA[SQL练习（牛客网非技术快速入门）]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/134161852</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/134161852</guid><author>rjf666</author><pubDate>Wed, 01 Nov 2023 16:44:47 +0800</pubDate><description><![CDATA[题目：现在运营想要对用户的年龄分布开展分析，在分析时想要剔除没有获取到年龄的用户，请你取出所有年龄值不为空的用户的设备ID，性别，年龄，学校的信息。题目：现在运营想要取出用户信息表中的年龄和gpa数据，并先按照gpa升序排序，再按照年龄升序排序输出，请取出相应数据。题目：现在运营想要筛选出所有北京大学的学生进行用户调研，请你从用户信息表中取出满足条件的数据，结果返回设备id和学校。题目：现在运营想要取出用户信息表中的用户年龄，请取出相应数据，并按照年龄升序排序。]]></description><category></category></item><item><title><![CDATA[JavaScript-常用内置对象（Number,Math,Date）]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127720991</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127720991</guid><author>rjf666</author><pubDate>Sun, 06 Nov 2022 21:26:26 +0800</pubDate><description><![CDATA[Number,Math,Date]]></description><category></category></item><item><title><![CDATA[Swing使用BeautyEye风格注意点]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127683382</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127683382</guid><author>rjf666</author><pubDate>Fri, 04 Nov 2022 10:28:15 +0800</pubDate><description><![CDATA[使用BeautyEye风格。右上角会自带有一个设置按钮，加上一行即可。]]></description><category></category></item><item><title><![CDATA[JavaScript-字面量类的定义和使用]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127596740</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127596740</guid><author>rjf666</author><pubDate>Sun, 30 Oct 2022 10:53:19 +0800</pubDate><description><![CDATA[字面量]]></description><category></category></item><item><title><![CDATA[JavaScript-类的定义和使用]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127596535</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127596535</guid><author>rjf666</author><pubDate>Sun, 30 Oct 2022 10:42:42 +0800</pubDate><description><![CDATA[【代码】JavaScript-类的定义和使用。]]></description><category></category></item><item><title><![CDATA[JavaScript-动态生成表格实现，创建删除表数据]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127595887</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127595887</guid><author>rjf666</author><pubDate>Sun, 30 Oct 2022 10:14:10 +0800</pubDate><description><![CDATA[要实现表格添加按钮的功能：

为按钮添加绑定单击事件]]></description><category></category></item><item><title><![CDATA[JavaScript-DOM按钮事件]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127593469</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127593469</guid><author>rjf666</author><pubDate>Sun, 30 Oct 2022 09:59:32 +0800</pubDate><description><![CDATA[鼠标点击按钮，输出系统时间。]]></description><category></category></item><item><title><![CDATA[JavaScript-DOM文本操作]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127593421</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127593421</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 22:43:08 +0800</pubDate><description><![CDATA[【代码】JavaScript-DOM文本操作。]]></description><category></category></item><item><title><![CDATA[JavaScript-DOM属性操作]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127593388</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127593388</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 22:39:12 +0800</pubDate><description><![CDATA[【代码】JavaScript-DOM属性操作。]]></description><category></category></item><item><title><![CDATA[JavaScript-DOM应用，增删查改]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589554</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589554</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:20:21 +0800</pubDate><description><![CDATA[【代码】JavaScript-DOM应用，增删查改。]]></description><category></category></item><item><title><![CDATA[JavaScript-getElement]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589530</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589530</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:18:41 +0800</pubDate><description><![CDATA[【代码】JavaScript-getElement。]]></description><category></category></item><item><title><![CDATA[JavaScript-函数]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589485</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589485</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:16:38 +0800</pubDate><description><![CDATA[【代码】JavaScript-函数。]]></description><category></category></item><item><title><![CDATA[JavaScript-数组，循环，高级运算符“...”]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589435</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589435</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:14:16 +0800</pubDate><description><![CDATA[【代码】JavaScript-数组，循环，高级运算符“...”]]></description><category></category></item><item><title><![CDATA[JavaScript-运算符]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589386</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589386</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:10:51 +0800</pubDate><description><![CDATA[基本差不多，        “+”       稍微特殊一点。]]></description><category></category></item><item><title><![CDATA[JavaScript-typeof方法]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127589312</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127589312</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 17:05:47 +0800</pubDate><description><![CDATA[l2的类型是null，应该算是个bug，不过问题不大。用来看数据类型的方法。]]></description><category></category></item><item><title><![CDATA[JavaScript-变量与常量案例]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127588881</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127588881</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 16:41:20 +0800</pubDate><description><![CDATA[变量可以使用短名称（比如 x 和 y），也可以使用描述性更好的名称（比如 age, sum, totalvolume）。JavaScript 变量还能保存其他数据类型，比如文本值 (name="Bill Gates")。在 JavaScript 中，类似 "Bill Gates" 这样一条文本被称为字符串。当您向变量赋的值是数值时，不要使用引号。JavaScript 变量有很多种类型，但是现在，我们只关注数字和字符串。当您向变量分配文本值时，应该用双引号或单引号包围这个值。]]></description><category></category></item><item><title><![CDATA[JavaScript-输入输出案例]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/127588752</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/127588752</guid><author>rjf666</author><pubDate>Sat, 29 Oct 2022 16:29:57 +0800</pubDate><description><![CDATA[【代码】JavaScript-输入输出案例。]]></description><category></category></item><item><title><![CDATA[Java日期循环]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/125621986</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/125621986</guid><author>rjf666</author><pubDate>Tue, 05 Jul 2022 16:11:27 +0800</pubDate><description><![CDATA[Java日期循环]]></description><category></category></item><item><title><![CDATA[Linux简单常用命令和解释]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/124929958</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/124929958</guid><author>rjf666</author><pubDate>Mon, 23 May 2022 16:39:09 +0800</pubDate><description><![CDATA[ls						显示不影藏的文件与文件夹
ls -l					显示不影藏的文件与文件夹的详细信息
ls -al					显示所有文件与文件夹的详细信息

pwd						查看当前所在目录

mkdir aa				创建文件夹	aaa 					make directory
mkdir -p aa/bb			创建多级文件夹aa/bb					-parents

rmdir aaa				删除空文件夹
rmdir -p aa/bb			删除非空文件夹aa/bb

rm a.txt				删除文件a.txt	.]]></description><category></category></item><item><title><![CDATA[Java去掉文件中的逗号]]></title><link>https://blog.youkuaiyun.com/rjf666/article/details/124735233</link><guid>https://blog.youkuaiyun.com/rjf666/article/details/124735233</guid><author>rjf666</author><pubDate>Thu, 12 May 2022 17:03:00 +0800</pubDate><description><![CDATA[解析报文的时候遇到只有逗号的文本文件，该方法传入文件地址，获得String数组


    //  去逗号
    public static String[][] readCommaTxT(String pathName) throws IOException {
        File file = new File(pathName);
        if (!file.exists())
            throw new RuntimeException("Not File!");

]]></description><category></category></item></channel></rss>