commit 94cdc9f719ff110dc5da250d475b19f70ee9c1fc
Author: WangJunyue <2768762959@qq.com>
Date:   Sun Apr 12 15:24:12 2026 +0800

    w6/Animal

diff --git a/Animal.java b/Animal.java
new file mode 100644
index 0000000..97d65cf
--- /dev/null
+++ b/Animal.java
@@ -0,0 +1,34 @@
+abstract class Animal {
+    public abstract void makesound();
+}
+interface Swimmable{
+    void swim();
+}
+class Dog extends Animal implements Swimmable{
+    @Override
+    public void makesound(){
+        System.out.println("汪汪汪");
+    }
+    @Override
+    public void swim(){
+        System.out.println("狗刨游泳");
+    }
+}
+class Cat extends Animal{
+    @Override
+    public void makesound(){
+        System.out.println("喵喵喵");
+    }
+}
+class Main{
+    public static void main(String[]args){
+        Animal a =new Dog();
+        Animal b =new Cat();
+        a.makesound();
+        b.makesound();
+        if (a instanceof Swimmable){
+            ((Swimmable)a).swim();
+        }
+    }
+}
+