From 47d6b9a897f6115817b02df161c8dfdfbd88d1d5 Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Thu, 10 Jul 2025 18:08:28 +0800
Subject: [PATCH] =?UTF-8?q?feat(class18):=20=E7=BB=A7=E6=89=BF=E5=85=B3?=
 =?UTF-8?q?=E7=B3=BB=EF=BC=8Cthis,super=EF=BC=8C=E6=96=B9=E6=B3=95?=
 =?UTF-8?q?=E9=87=8D=E5=86=99?=
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- 在 class18 包中添加了 Test 和 Test2 类，演示了类的继承和方法重写
- 在 class19 包中添加了 Test 类，展示了方法重写的实际应用
---
 src/class18/Test.java  | 25 +++++++++++++++++++++++++
 src/class18/Test2.java | 20 ++++++++++++++++++++
 src/class19/Test.java  | 22 ++++++++++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 src/class18/Test.java
 create mode 100644 src/class18/Test2.java
 create mode 100644 src/class19/Test.java

diff --git a/src/class18/Test.java b/src/class18/Test.java
new file mode 100644
index 0000000..bf1000b
--- /dev/null
+++ b/src/class18/Test.java
@@ -0,0 +1,25 @@
+package class18;
+
+public class Test {
+    public static void main(String[] args) {
+        C c = new C();
+        System.out.println(c.a);
+        System.out.println(c.b);
+        c.m1();
+    }
+}
+class A{
+    int a = 10;
+
+    void m1(){
+        System.out.println(a);
+    }
+}
+
+class B extends A{
+    int b = 30;
+}
+
+class C extends B{
+    int a = 30;
+}
diff --git a/src/class18/Test2.java b/src/class18/Test2.java
new file mode 100644
index 0000000..f3aef97
--- /dev/null
+++ b/src/class18/Test2.java
@@ -0,0 +1,20 @@
+package class18;
+
+public class Test2 {
+    public static void main(String[] args) {
+        Zi z = new Zi();
+        z.print();
+    }
+}
+class Fu{
+    String name = "fu的name";
+}
+class Zi extends Fu{
+    String name = "zi的name";
+    public void print(){
+        String name = "局部变量";
+        System.out.println(name); // 局部变量
+        System.out.println(this.name); // zi的name
+        System.out.println(super.name); // fu的name
+    }
+}
diff --git a/src/class19/Test.java b/src/class19/Test.java
new file mode 100644
index 0000000..f9e6db1
--- /dev/null
+++ b/src/class19/Test.java
@@ -0,0 +1,22 @@
+package class19;
+
+public class Test {
+    public static void main(String[] args) {
+        Cat c = new Cat();
+        c.cry();
+
+    }
+}
+class Cat extends  Animal{
+    @Override //方法重写的校验注解，会校验与被重写方法的形参和返回值类型是否一致，保证方法重写安全
+    public void cry() {
+        System.out.println("喵喵喵~~~");
+    }
+}
+
+class Animal{
+    public void cry(){
+        System.out.println("动物会叫~~~");
+    }
+
+}