From a714712f9657932e56e4c358a51116508525ae62 Mon Sep 17 00:00:00 2001
From: NCJOAQ <2627723488@qq.com>
Date: Mon, 14 Jul 2025 23:54:41 +0800
Subject: [PATCH] =?UTF-8?q?feat(class22):=20=E5=A4=9A=E6=80=81=E8=B0=83?=
 =?UTF-8?q?=E7=94=A8=EF=BC=8Cinstanceof=E5=AF=B9=E8=B1=A1=E7=B1=BB?=
 =?UTF-8?q?=E5=9E=8B=E6=A3=80=E6=B5=8B=20-=20=E6=96=B0=E5=A2=9E=20Tortoise?=
 =?UTF-8?q?=20=E5=92=8C=20Wolf=20=E7=B1=BB=EF=BC=8C=E7=BB=A7=E6=89=BF?=
 =?UTF-8?q?=E8=87=AA=20Animal=20=E7=B1=BB=E5=B9=B6=E9=87=8D=E5=86=99=20run?=
 =?UTF-8?q?=20=E6=96=B9=E6=B3=95=20-=20Tortoise=20=E7=B1=BB=E5=A2=9E?=
 =?UTF-8?q?=E5=8A=A0=E7=8B=AC=E6=9C=89=E7=9A=84=20shrinkHead=20=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=20-=20=E6=96=B0=E5=A2=9E=20Test=20=E7=B1=BB=EF=BC=8C?=
 =?UTF-8?q?=E6=BC=94=E7=A4=BA=E5=A4=9A=E6=80=81=E5=92=8C=E5=BC=BA=E5=88=B6?=
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 =?UTF-8?q?-=20=E5=AE=9E=E7=8E=B0=20go=20=E6=96=B9=E6=B3=95=EF=BC=8C?=
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 =?UTF-8?q?=E6=96=B9=E6=B3=95?=
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---
 src/class22/Animal.java   |  8 ++++++++
 src/class22/Test.java     | 36 ++++++++++++++++++++++++++++++++++++
 src/class22/Tortoise.java | 12 ++++++++++++
 src/class22/Wolf.java     |  8 ++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 src/class22/Animal.java
 create mode 100644 src/class22/Test.java
 create mode 100644 src/class22/Tortoise.java
 create mode 100644 src/class22/Wolf.java

diff --git a/src/class22/Animal.java b/src/class22/Animal.java
new file mode 100644
index 0000000..2fb675c
--- /dev/null
+++ b/src/class22/Animal.java
@@ -0,0 +1,8 @@
+package class22;
+
+public class Animal {
+
+    public void run(){
+        System.out.println("动物会跑~~~");
+    }
+}
diff --git a/src/class22/Test.java b/src/class22/Test.java
new file mode 100644
index 0000000..e440f7a
--- /dev/null
+++ b/src/class22/Test.java
@@ -0,0 +1,36 @@
+package class22;
+
+public class Test {
+    public static void main(String[] args) {
+        Animal a1 = new Tortoise();
+        a1.run();
+//        多态无法调用子类独有的方法
+//        a1.shrinkHead();
+        Tortoise t1 = (Tortoise)a1;
+        t1.shrinkHead();
+//        强制转换
+//        Wolf test1= (Wolf)a1;//运行时异常
+
+
+
+
+        System.out.println("=========================");
+
+        Wolf w = new Wolf();
+        go(w);
+        Tortoise t = new Tortoise();
+        go(t);
+    }
+
+    public static void go(Animal w){
+        System.out.println("开始......");
+        w.run();
+        if (w instanceof Tortoise) {
+            Tortoise t=(Tortoise)w;
+            t.shrinkHead();
+        } else if (w instanceof Wolf) {
+            Wolf w1=(Wolf)w;
+            w1.run();
+        }
+    }
+}
diff --git a/src/class22/Tortoise.java b/src/class22/Tortoise.java
new file mode 100644
index 0000000..2e062bc
--- /dev/null
+++ b/src/class22/Tortoise.java
@@ -0,0 +1,12 @@
+package class22;
+
+public class Tortoise extends Animal {
+    @Override
+    public void run() {
+
+        System.out.println("🐢跑的贼慢~~");
+    }
+    public void shrinkHead(){
+        System.out.println("🐢缩头了~~");
+    }
+}
diff --git a/src/class22/Wolf.java b/src/class22/Wolf.java
new file mode 100644
index 0000000..950022f
--- /dev/null
+++ b/src/class22/Wolf.java
@@ -0,0 +1,8 @@
+package class22;
+
+public class Wolf extends Animal {
+    @Override
+    public void run() {
+        System.out.println("狼跑的贼溜~");
+    }
+}