From 168fb05eb38990b871b5e832a4ea062ddbff8f2a Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 2 Apr 2026 11:30:12 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day12-=E5=85=83=E6=B3=A8?=
 =?UTF-8?q?=E8=A7=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 javaSE-day12/src/com/inmind/Demo08.java           | 15 +++++++++++++++
 .../src/com/inmind/annotation03/MyAnnotation.java |  3 +++
 .../src/com/inmind/annotation03/Student.java      |  2 +-
 3 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 javaSE-day12/src/com/inmind/Demo08.java

diff --git a/javaSE-day12/src/com/inmind/Demo08.java b/javaSE-day12/src/com/inmind/Demo08.java
new file mode 100644
index 0000000..46c7efd
--- /dev/null
+++ b/javaSE-day12/src/com/inmind/Demo08.java
@@ -0,0 +1,15 @@
+package com.inmind;
+/*
+元注解:用来修饰注解的注解
+    @Target:设置某一个注解的作用范围
+        ElementType.TYPE    类
+        ElementType.FIELD   属性
+        ElementType.CONSTRUCTOR   构造器
+        ElementType.METHOD    方法
+    @Retention:设置某一个注解的生命周期
+        SOURCE:编译时期有效
+        CLASS:编译后,运行前有效
+        RUNTIME:运行时有效   (比较常用,结合反射操作)
+ */
+public class Demo08 {
+}
diff --git a/javaSE-day12/src/com/inmind/annotation03/MyAnnotation.java b/javaSE-day12/src/com/inmind/annotation03/MyAnnotation.java
index 06a5776..8b89024 100644
--- a/javaSE-day12/src/com/inmind/annotation03/MyAnnotation.java
+++ b/javaSE-day12/src/com/inmind/annotation03/MyAnnotation.java
@@ -1,5 +1,7 @@
 package com.inmind.annotation03;
 
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
 import java.util.ArrayList;
 
 /*
@@ -18,6 +20,7 @@ import java.util.ArrayList;
 
 6.注解在使用时，属性值必须赋值，默认值可以覆盖
  */
+@Target(value = {ElementType.TYPE,ElementType.FIELD,ElementType.METHOD,ElementType.CONSTRUCTOR})
 public @interface MyAnnotation {
      public static final int age = 1;//注解中的常量
     String name() default "张三";//name属性
diff --git a/javaSE-day12/src/com/inmind/annotation03/Student.java b/javaSE-day12/src/com/inmind/annotation03/Student.java
index 57c8426..095c9ce 100644
--- a/javaSE-day12/src/com/inmind/annotation03/Student.java
+++ b/javaSE-day12/src/com/inmind/annotation03/Student.java
@@ -25,7 +25,7 @@ public class Student {
     }
 
     @MyAnnotation(1)
-    private int show(@MyAnnotation(1) int i){
+    private int show(int i){
         System.out.println("有参有返回值的show方法执行了");
         return i+100;
     }