diff --git a/_sidebar.md b/_sidebar.md
index 8aa2ef5..9030948 100644
--- a/_sidebar.md
+++ b/_sidebar.md
@@ -5,6 +5,7 @@
 - Java
   - [概述和环境配置](java/index.md)
   - [语言基础](java/fundamentals/index.md)
+  - [核心编程](java/core/index.md)
   
 - 其他小工具
   - [JWT](jwt/README.md)
diff --git a/java/core/annotation.md b/java/core/annotation.md
new file mode 100644
index 0000000..1b0a6ef
--- /dev/null
+++ b/java/core/annotation.md
@@ -0,0 +1,4 @@
+# Annotation（注解）
+* [Java @Deprecated Annotation（注解）](https://www.ossez.com/t/java-deprecated-annotation/13676)
+
+
diff --git a/java/core/index.md b/java/core/index.md
new file mode 100644
index 0000000..a74ed71
--- /dev/null
+++ b/java/core/index.md
@@ -0,0 +1,3 @@
+# Java 核心编程
+
+[Annotation（注解）](annotation.md ':include')