From baefa25e78fdf717e4a0b28b464112d31b66060e Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Tue, 15 Jul 2025 15:26:36 +0800
Subject: [PATCH] =?UTF-8?q?feat(class25):=20=E6=B7=BB=E5=8A=A0=E5=8D=95?=
 =?UTF-8?q?=E4=BE=8B=E6=A8=A1=E5=BC=8F=E7=A4=BA=E4=BE=8B=E4=BB=A3=E7=A0=81?=
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- 新增 A 类和 B 类作为单例模式的示例
- 更新 .gitignore 文件，忽略 META-INF 和 MANIFEST.MF 文件
- 在项目设置中添加 Lombok 注解支持
- 修改 Test 类，注释掉 SilverCard 相关代码
- 新增 Test 类测试单例模式
---
 .gitignore            |  5 ++++-
 .idea/misc.xml        |  5 +++++
 HM-JAVA.iml           |  1 +
 src/class23/Test.java |  4 ++--
 src/class25/A.java    | 11 +++++++++++
 src/class25/B.java    | 13 +++++++++++++
 src/class25/Test.java | 19 +++++++++++++++++++
 7 files changed, 55 insertions(+), 3 deletions(-)
 create mode 100644 src/class25/A.java
 create mode 100644 src/class25/B.java
 create mode 100644 src/class25/Test.java

diff --git a/.gitignore b/.gitignore
index da25e26..78596f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,4 +28,7 @@ bin/
 .vscode/
 
 ### Mac OS ###
-.DS_Store
\ No newline at end of file
+.DS_Store
+
+META-INF/
+MANIFEST.MF
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6f29fee..378d69f 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="EntryPointsManager">
+    <writeAnnotations>
+      <writeAnnotation name="lombok.Getter" />
+    </writeAnnotations>
+  </component>
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
diff --git a/HM-JAVA.iml b/HM-JAVA.iml
index 22cb66c..ed19592 100644
--- a/HM-JAVA.iml
+++ b/HM-JAVA.iml
@@ -4,6 +4,7 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/.idea/artifacts" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
diff --git a/src/class23/Test.java b/src/class23/Test.java
index 2893ad2..efa9173 100644
--- a/src/class23/Test.java
+++ b/src/class23/Test.java
@@ -8,8 +8,8 @@ public class Test {
         goldCard.deposit(1000);
         pay(goldCard);
 
-        SilverCard silverCard = new SilverCard("654321", "李四", 123456789, 5000);
-        pay(silverCard);
+//        SilverCard silverCard = new SilverCard("654321", "李四", 123456789, 5000);
+//        pay(silverCard);
     }
     public static void pay(Card c){
         System.out.println("请刷卡，请输入您的消费金额：");
diff --git a/src/class25/A.java b/src/class25/A.java
new file mode 100644
index 0000000..5276248
--- /dev/null
+++ b/src/class25/A.java
@@ -0,0 +1,11 @@
+package class25;
+
+import lombok.Getter;
+
+public class A {
+    //单例类
+    @Getter
+    private static final A a = new A();
+    private A(){}
+
+}
diff --git a/src/class25/B.java b/src/class25/B.java
new file mode 100644
index 0000000..66f5b12
--- /dev/null
+++ b/src/class25/B.java
@@ -0,0 +1,13 @@
+package class25;
+
+public class B {
+    private static B b;
+    private B() {
+    }
+    public static B getInstance() {
+        if (b == null) {
+            b = new B();
+        }
+        return b;
+    }
+}
diff --git a/src/class25/Test.java b/src/class25/Test.java
new file mode 100644
index 0000000..7dbb7b2
--- /dev/null
+++ b/src/class25/Test.java
@@ -0,0 +1,19 @@
+package class25;
+
+public class Test {
+    public static void main(String[] args) {
+        A a = A.getA();
+        A a2 = A.getA();
+        System.out.println(a==a2);
+        System.out.println(a.hashCode());
+        System.out.println(a2.hashCode());
+        System.out.println("================");
+        B b = B.getInstance();
+        B b1 = B.getInstance();
+        System.out.println(b==b1);
+        System.out.println(b.hashCode());
+        System.out.println(b1.hashCode());
+
+
+    }
+}