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@@ -26,9 +26,9 @@ title: JavaGuide（Java学习&&面试指南）
     </p>
 </div>
 
-> 1. **面试专版** ：准备面试的小伙伴可以考虑面试专版：[《Java 面试进阶指北 》](https://www.yuque.com/docs/share/f37fc804-bfe6-4b0d-b373-9c462188fec7) (质量很高，专为面试打造，配合 JavaGuide 食用)。
-> 1. **知识星球** ：专属面试小册/一对一交流/简历修改/专属求职指南，欢迎加入 [JavaGuide 知识星球](https://www.yuque.com/docs/share/8a30ffb5-83f3-40f9-baf9-38de68b906dc)（点击链接即可查看星球的详细介绍，一定一定一定确定自己真的需要再加入，一定一定要看完详细介绍之后再加我）。
-> 2. **转载须知** ：以下所有文章如非文首说明为转载皆为我（Guide 哥）的原创，转载在文首注明出处，如发现恶意抄袭/搬运，会动用法律武器维护自己的权益。让我们一起维护一个良好的技术创作环境！
+> - **面试专版** ：准备面试的小伙伴可以考虑面试专版：[《Java 面试进阶指北 》](https://www.yuque.com/docs/share/f37fc804-bfe6-4b0d-b373-9c462188fec7) (质量很高，专为面试打造，配合 JavaGuide 食用)。
+> - **知识星球** ：专属面试小册/一对一交流/简历修改/专属求职指南，欢迎加入 [JavaGuide 知识星球](https://www.yuque.com/docs/share/8a30ffb5-83f3-40f9-baf9-38de68b906dc)（点击链接即可查看星球的详细介绍，一定一定一定确定自己真的需要再加入，一定一定要看完详细介绍之后再加我）。
+> - **转载须知** ：以下所有文章如非文首说明为转载皆为 JavaGuide 原创，转载在文首注明出处，如发现恶意抄袭/搬运，会动用法律武器维护自己的权益。让我们一起维护一个良好的技术创作环境！
 
 <div style="text-align:center">
     <p>
 
@@ -42,7 +42,7 @@ SPI 将服务接口和具体的服务实现分离开来，将服务调用方和
 
 当实现方提供了接口和实现，我们可以通过调用实现方的接口从而拥有实现方给我们提供的能力，这就是 API ，这种接口和实现都是放在实现方的。
 
-当接口存在于调用方这边时，就是 SPI ，由接口调用方确定接口规则，然后由不同的厂商去根绝这个规则对这个接口进行实现，从而提供服务。
+当接口存在于调用方这边时，就是 SPI ，由接口调用方确定接口规则，然后由不同的厂商去根据这个规则对这个接口进行实现，从而提供服务。
 
 举个通俗易懂的例子：公司 H 是一家科技公司，新设计了一款芯片，然后现在需要量产了，而市面上有好几家芯片制造业公司，这个时候，只要 H 公司指定好了这芯片生产的标准（定义好了接口标准），那么这些合作的芯片公司（服务提供者）就按照标准交付自家特色的芯片（提供不同方案的实现，但是给出来的结果是一样的）。
 
 
@@ -3,6 +3,16 @@ title: 常见问题
 category: 走近项目
 ---
 
+## JavaGuide 有没有 PDF 版本？
+
+由于 JavaGuide 内容在持续完善，所以并没有一个完全与之同步的 PDF 版本提供。如果你想要 PDF 版本的话，可以考虑 **《JavaGuide 面试突击版》** ，这是对 JavaGuide 内容的浓缩总结。
+
+《JavaGuide 面试突击版》在我的公众号后台回复“**PDF**”即可获取，免费的。除了 《JavaGuide 面试突击版》之外，还会免费送你多本优质面试 PDF 手册。
+
+<div align="center">
+    <img src="https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/github/javaguide/gongzhonghaoxuanchuan.png" style="margin: 0 auto;" />
+    </p>
+</div>
 
 ## 如何看待 JavaGuide 的 star 数量很多？
 
@@ -24,9 +34,11 @@ JavaGuide 这个项目诞生一年左右就有出版社的老师联系我了，
 
 **出书既能博名又能赚点钱，我为啥不考虑出书呢？**
 
-1. JavaGuide 的很多内容我还不是很满意，也一直在维护中，细心的小伙伴看我的提交记录就明白了。
-2. 开源版本更容易维护和修改，也能让更多人更方便地参与到项目的建设中，这也是我最初做这个项目的初衷。
-3. 我觉得出书是一件神圣的事情，自认能力还不够。
-4. 个人精力有限，不光有本职工作，还弄了一个[知识星球](https://sourl.cn/psyWaE)赚点外快，还要维护完善 JavaGuide。
+- JavaGuide 的很多内容我还不是很满意，也一直在维护中，细心的小伙伴看我的提交记录就明白了。
+- 开源版本更容易维护和修改，也能让更多人更方便地参与到项目的建设中，这也是我最初做这个项目的初衷。
+- 我觉得出书是一件神圣的事情，自认能力还不够。
+- 个人精力有限，不光有本职工作，还弄了一个[知识星球](https://sourl.cn/psyWaE)赚点外快，还要维护完善 JavaGuide。
+- ......
+
+这几年一直在默默完善，真心希望 JavaGuide 越来越好，帮助到更多朋友！也欢迎大家参与进来！
 
-这几年一直在默默完善，真心希望 JavaGuide 越来越好，帮助到更多朋友！也欢迎大家参与进来！
 
@@ -175,7 +175,7 @@ head:
 
 角色与用户管理都是可以直接改变用户权限的核心模块，整个设计思路如下图：
 
-![角色与用户管理模块设计](https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/github/javaguide/system-design/security/design-of-authority-system/role-and-user-management.png)
+![角色与用户管理模块设计](https://guide-blog-images.oss-cn-shenzhen.aliyuncs.com/github/javaguide/system-design/security/design-of-authority-system/design-of-authority-system:role-and-user-management.png)
 
 这个模块设计重点是需要考虑到批量操作。无论是通过角色关联用户，还是给用户批量增加/删除/重置权限，批量操作的场景都是系统需要设计好的。