From 01b01c564f6e50c6d3cf6228c63808e7338a3edb Mon Sep 17 00:00:00 2001
From: LingCoder <lingcoder@gmail.com>
Date: Mon, 25 Mar 2019 00:59:07 +0800
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---
 SUMMARY.md         | 17 ++++++++---------
 book/18-Strings.md | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/SUMMARY.md b/SUMMARY.md
index 681c2de..60afd31 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -220,15 +220,14 @@
     * [文件读写](book/17-Files.md#文件读写)
     * [本章小结](book/17-Files.md#本章小结)
 * [第十八章 字符串](book/18-Strings.md)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
-    * [](book/18-Strings.md#)
+    * [字符串的不可变](book/18-Strings.md#字符串的不可变)
+    * [重载和StringBuilder](book/18-Strings.md#重载和StringBuilder)
+    * [意外递归](book/18-Strings.md#意外递归)
+    * [字符串操作](book/18-Strings.md#字符串操作)
+    * [格式化输出](book/18-Strings.md#格式化输出)
+    * [常规表达式](book/18-Strings.md#常规表达式)
+    * [扫描输入](book/18-Strings.md#扫描输入)
+    * [StringTokenizer类](book/18-Strings.md#StringTokenizer类)
     * [本章小结](book/18-Strings.md#本章小结)
 * [第十九章 类型信息](book/19-Type-Information.md)
     * [](book/19-Type-Information.md#)
diff --git a/book/18-Strings.md b/book/18-Strings.md
index bd07bf6..fe2d712 100644
--- a/book/18-Strings.md
+++ b/book/18-Strings.md
@@ -1,7 +1,50 @@
 [TOC]
 
+<!--  -->
 # 第十八章 字符串
 
+
+<!-- Immutable Strings -->
+## 字符串的不可变
+
+
+<!-- Overloading + vs. StringBuilder -->
+## 重载和StringBuilder
+
+
+<!-- Unintended Recursion -->
+## 意外递归
+
+
+<!-- Operations on Strings -->
+## 字符串操作
+
+
+<!-- Formatting Output -->
+## 格式化输出
+
+
+<!-- Regular Expressions -->
+## 常规表达式
+
+
+<!-- Scanning Input -->
+## 扫描输入
+
+
+<!-- StringTokenizer -->
+## StringTokenizer类
+
+
+<!-- Summary -->
+## 本章小结
+
+
+
+
+
+
+
 <!-- 分页 -->
 
 <div style="page-break-after: always;"></div>
\ No newline at end of file