From f15da1385c3043616f81cf358995e207496873b5 Mon Sep 17 00:00:00 2001
From: LingCoder <lingcoder@gmail.com>
Date: Sun, 24 Mar 2019 23:33:00 +0800
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 SUMMARY.md             | 26 +++++++++----------
 book/12-Collections.md | 57 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 13 deletions(-)

diff --git a/SUMMARY.md b/SUMMARY.md
index 46859ad..d4caa14 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -146,19 +146,19 @@
     * [内部类标识符](book/11-Inner-Classes.md#内部类标识符)
     * [本章小结](book/11-Inner-Classes.md#本章小结)
 * [第十二章 集合](book/12-Collections.md)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
-    * [](book/12-Collections.md#)
+    * [泛型和类型安全的集合](book/12-Collections.md#泛型和类型安全的集合)
+    * [基本概念](book/12-Collections.md#基本概念)
+    * [添加元素组](book/12-Collections.md#添加元素组)
+    * [集合的打印](book/12-Collections.md#集合的打印)
+    * [列表List](book/12-Collections.md#列表List)
+    * [迭代器Iterators](book/12-Collections.md#迭代器Iterators)
+    * [链表LinkedList](book/12-Collections.md#链表LinkedList)
+    * [堆栈Stack](book/12-Collections.md#堆栈Stack)
+    * [集合Set](book/12-Collections.md#集合Set)
+    * [映射Map](book/12-Collections.md#映射Map)
+    * [队列Queue](book/12-Collections.md#队列Queue)
+    * [集合与迭代器](book/12-Collections.md#集合与迭代器)
+    * [for-in和迭代器](book/12-Collections.md#for-in和迭代器)
     * [本章小结](book/12-Collections.md#本章小结)
 * [第十三章 函数式编程](book/13-Functional-Programming.md)
     * [](book/13-Functional-Programming.md#)
diff --git a/book/12-Collections.md b/book/12-Collections.md
index 6cbc671..bf50850 100644
--- a/book/12-Collections.md
+++ b/book/12-Collections.md
@@ -1,7 +1,64 @@
 [TOC]
 
+<!-- Collections -->
 # 第十二章 集合
 
+
+<!-- Generics and Type-Safe Collections -->
+## 泛型和类型安全的集合
+
+
+<!-- Basic Concepts -->
+## 基本概念
+
+
+<!-- Adding Groups of Elements -->
+## 添加元素组
+
+
+<!-- Printing Collections -->
+## 集合的打印
+
+
+<!-- List -->
+## 列表List
+
+
+<!-- Iterators -->
+## 迭代器Iterators
+
+
+<!-- LinkedList -->
+## 链表LinkedList
+
+
+<!-- Stack -->
+## 堆栈Stack
+
+
+<!-- Set -->
+## 集合Set
+
+
+<!-- Map -->
+## 映射Map
+
+
+<!-- Queue -->
+## 队列Queue
+
+
+<!-- Collection vs. Iterator -->
+## 集合与迭代器
+
+
+<!-- for-in and Iterators -->
+## for-in和迭代器
+
+
+<!-- Summary -->
+## 本章小结
+
 <!-- 分页 -->
 
 <div style="page-break-after: always;"></div>
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