From 1c862babf32165d3e375676046a6f844684a7b85 Mon Sep 17 00:00:00 2001
From: 1326670425 <1326670425@qq.com>
Date: Sun, 14 Jul 2019 13:31:04 +0800
Subject: [PATCH] Update README.md

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index c06720a..b11045d 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@
 - [x] [第九章 多态](docs/book/09-Polymorphism.md)
 - [x] [第十章 接口](docs/book/10-Interfaces.md)
 - [x] [第十一章 内部类](docs/book/11-Inner-Classes.md)
-- [ ] [第十二章 集合](docs/book/12-Collections.md)
+- [x] [第十二章 集合](docs/book/12-Collections.md)
 - [x] [第十三章 函数式编程](docs/book/13-Functional-Programming.md)
 - [x] [第十四章 流式编程](docs/book/14-Streams.md) 
 - [x] [第十五章 异常](docs/book/15-Exceptions.md)