From 612c7f8bfda4c6f1181286fa084de86d1cf1f310 Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Tue, 15 Jul 2025 03:03:10 +0800
Subject: [PATCH] =?UTF-8?q?feat(class24):=20=E7=AE=80=E5=8D=95final?=
 =?UTF-8?q?=E7=A4=BA=E4=BE=8B?=
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- 新增 FinalDemo1 类，演示 final 关键字的用法- 新增 FinalDemo2 类，使用 Constant 类中的常量
- 添加 Constant 类，定义系统名称常量
---
 src/class24/Constant.java   |  6 ++++++
 src/class24/FinalDemo1.java | 27 +++++++++++++++++++++++++++
 src/class24/FinalDemo2.java |  7 +++++++
 3 files changed, 40 insertions(+)
 create mode 100644 src/class24/Constant.java
 create mode 100644 src/class24/FinalDemo1.java
 create mode 100644 src/class24/FinalDemo2.java

diff --git a/src/class24/Constant.java b/src/class24/Constant.java
new file mode 100644
index 0000000..5fd4b37
--- /dev/null
+++ b/src/class24/Constant.java
@@ -0,0 +1,6 @@
+package class24;
+
+public class Constant {
+    public static final String SYSTEM_NAME = "黑马程序员智能家居系统";
+
+}
diff --git a/src/class24/FinalDemo1.java b/src/class24/FinalDemo1.java
new file mode 100644
index 0000000..dc3c469
--- /dev/null
+++ b/src/class24/FinalDemo1.java
@@ -0,0 +1,27 @@
+package class24;
+
+public class FinalDemo1 {
+    public static void main(String[] args) {
+        C d = new D();
+        d.show();
+    }
+}
+class A{}
+final class B extends A{
+    // final 修饰类，不能被继承
+    // final 修饰方法，不能被重写
+    // final 修饰变量，不能被修改
+    // final 修饰局部变量，不能被修改
+}
+class C{
+    public final void show(){
+        // final 修饰方法，不能被重写
+        System.out.println("show方法被执行");
+
+    }
+}
+class D extends C{
+    // public void show(){}
+
+}
+
diff --git a/src/class24/FinalDemo2.java b/src/class24/FinalDemo2.java
new file mode 100644
index 0000000..fd5ef4e
--- /dev/null
+++ b/src/class24/FinalDemo2.java
@@ -0,0 +1,7 @@
+package class24;
+
+public class FinalDemo2 {
+    public static void main(String[] args) {
+        System.out.println(Constant.SYSTEM_NAME);
+    }
+}