commit 66621d6ca81173ccd837e7f5cf37ce46c2156307
Author: SALAH ABDULLAH阿山 <2040abdullah@gmail.com>
Date:   Fri May 8 16:20:24 2026 +0800

    完成 animal 的作业

diff --git a/src/main/java/org/example/Main.java b/src/main/java/org/example/Main.java
new file mode 100644
index 0000000..ed63b7e
--- /dev/null
+++ b/src/main/java/org/example/Main.java
@@ -0,0 +1,49 @@
+// 游泳接口
+interface Swimmable {
+    void swim();
+}
+
+// 抽象动物类
+abstract class Animal {
+    public abstract void makeSound();
+}
+
+// 狗：继承Animal + 实现游泳接口
+class Dog extends Animal implements Swimmable {
+    @Override
+    public void makeSound() {
+        System.out.println("小狗汪汪汪叫");
+    }
+
+    @Override
+    public void swim() {
+        System.out.println("小狗会游泳，正在游泳");
+    }
+}
+
+// 猫：只继承Animal，不实现游泳接口
+class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("小猫喵喵喵叫");
+    }
+}
+
+// 主类名改成Main！和文件名Main.java完全一致
+public class Main {
+    public static void main(String[] args) {
+        // 多态测试：父类引用指向子类对象
+        Animal animal1 = new Dog();
+        Animal animal2 = new Cat();
+
+        // 多态调用叫声
+        animal1.makeSound();
+        animal2.makeSound();
+
+        // 向下转型调用游泳方法
+        if (animal1 instanceof Dog dog) {
+            dog.swim();
+        }
+    }
+}
+=
\ No newline at end of file