From 67eb00e39b53471c22c441b964fbf110b993b231 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Mon, 5 Jan 2026 16:16:58 +0800
Subject: [PATCH] =?UTF-8?q?day09--=E7=BB=A7=E6=89=BF=E7=9A=84=E7=89=B9?=
 =?UTF-8?q?=E7=82=B9-=E5=8D=95=E7=BB=A7=E6=89=BF-=E5=A4=9A=E5=B1=82?=
 =?UTF-8?q?=E7=BB=A7=E6=89=BF?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day09/src/com/inmind/extends_td05/A.java      |  4 ++++
 day09/src/com/inmind/extends_td05/B.java      |  4 ++++
 day09/src/com/inmind/extends_td05/C.java      |  4 ++++
 day09/src/com/inmind/extends_td05/D.java      |  4 ++++
 day09/src/com/inmind/extends_td05/Demo07.java | 10 ++++++++++
 5 files changed, 26 insertions(+)
 create mode 100644 day09/src/com/inmind/extends_td05/A.java
 create mode 100644 day09/src/com/inmind/extends_td05/B.java
 create mode 100644 day09/src/com/inmind/extends_td05/C.java
 create mode 100644 day09/src/com/inmind/extends_td05/D.java
 create mode 100644 day09/src/com/inmind/extends_td05/Demo07.java

diff --git a/day09/src/com/inmind/extends_td05/A.java b/day09/src/com/inmind/extends_td05/A.java
new file mode 100644
index 0000000..e524a3c
--- /dev/null
+++ b/day09/src/com/inmind/extends_td05/A.java
@@ -0,0 +1,4 @@
+package com.inmind.extends_td05;
+//父类
+public class A {
+}
diff --git a/day09/src/com/inmind/extends_td05/B.java b/day09/src/com/inmind/extends_td05/B.java
new file mode 100644
index 0000000..0b435a9
--- /dev/null
+++ b/day09/src/com/inmind/extends_td05/B.java
@@ -0,0 +1,4 @@
+package com.inmind.extends_td05;
+
+public class B extends A{
+}
diff --git a/day09/src/com/inmind/extends_td05/C.java b/day09/src/com/inmind/extends_td05/C.java
new file mode 100644
index 0000000..5692f75
--- /dev/null
+++ b/day09/src/com/inmind/extends_td05/C.java
@@ -0,0 +1,4 @@
+package com.inmind.extends_td05;
+//父类
+public class C extends B{
+}
diff --git a/day09/src/com/inmind/extends_td05/D.java b/day09/src/com/inmind/extends_td05/D.java
new file mode 100644
index 0000000..6eb7d85
--- /dev/null
+++ b/day09/src/com/inmind/extends_td05/D.java
@@ -0,0 +1,4 @@
+package com.inmind.extends_td05;
+
+public class D extends C{
+}
diff --git a/day09/src/com/inmind/extends_td05/Demo07.java b/day09/src/com/inmind/extends_td05/Demo07.java
new file mode 100644
index 0000000..650e981
--- /dev/null
+++ b/day09/src/com/inmind/extends_td05/Demo07.java
@@ -0,0 +1,10 @@
+package com.inmind.extends_td05;
+/*
+继承的特点-单继承-多层继承
+注意：java中所有的类，都直接或间接继承Object
+ */
+public class Demo07 {
+    public static void main(String[] args) {
+        D d = new D();
+    }
+}