diff --git a/docs/java/collection/arraylist-source-code.md b/docs/java/collection/arraylist-source-code.md
index 3ef6e42b..9f08ec51 100644
--- a/docs/java/collection/arraylist-source-code.md
+++ b/docs/java/collection/arraylist-source-code.md
@@ -1,5 +1,5 @@
 ---
-title:  ArrayList 源码+扩容机制分析
+title:  ArrayList源码&扩容机制分析
 category: Java
 tag:
   - Java集合
diff --git a/docs/java/collection/concurrent-hash-map-source-code.md b/docs/java/collection/concurrent-hash-map-source-code.md
index 6d765697..8496df0e 100644
--- a/docs/java/collection/concurrent-hash-map-source-code.md
+++ b/docs/java/collection/concurrent-hash-map-source-code.md
@@ -1,5 +1,5 @@
 ---
-title:  ConcurrentHashMap源码+底层数据结构分析
+title:  ConcurrentHashMap源码&底层数据结构分析
 category: Java
 tag:
   - Java集合
diff --git a/docs/java/collection/hashmap-source-code.md b/docs/java/collection/hashmap-source-code.md
index 7996b276..c2c5cf36 100644
--- a/docs/java/collection/hashmap-source-code.md
+++ b/docs/java/collection/hashmap-source-code.md
@@ -1,5 +1,5 @@
 ---
-title:  HashMap源码+底层数据结构分析
+title:  HashMap源码&底层数据结构分析
 category: Java
 tag:
   - Java集合