diff --git a/main/w6/Animal.class b/main/w6/Animal.class
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diff --git a/main/w6/Animals.class b/main/w6/Animals.class
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diff --git a/main/w6/Animals.java b/main/w6/Animals.java
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+++ b/main/w6/Animals.java
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+// 抽象类Animal
+abstract class Animal {
+    // 抽象方法makesound()
+    public abstract void makesound();
+}
+
+// 接口Swimmable
+interface Swimmable {
+    // 方法swim()
+    void swim();
+}
+
+// Dog类继承Animal并实现Swimmable接口
+class Dog extends Animal implements Swimmable {
+    @Override
+    public void makesound() {
+        System.out.println("Dog barks: Woof! Woof!");
+    }
+    
+    @Override
+    public void swim() {
+        System.out.println("Dog is swimming");
+    }
+}
+
+// Cat类继承Animal
+class Cat extends Animal {
+    @Override
+    public void makesound() {
+        System.out.println("Cat meows: Meow! Meow!");
+    }
+}
+
+public class Animals {
+    public static void main(String[] args) {
+        // 多态测试
+        Animal animal1 = new Dog();
+        Animal animal2 = new Cat();
+        
+        System.out.println("Testing polymorphism:");
+        animal1.makesound();
+        animal2.makesound();
+        
+        // 测试Dog的swim方法
+        System.out.println("\nTesting swim method:");
+        if (animal1 instanceof Swimmable) {
+            ((Swimmable) animal1).swim();
+        }
+        
+        if (animal2 instanceof Swimmable) {
+            ((Swimmable) animal2).swim();
+        } else {
+            System.out.println("Cat cannot swim");
+        }
+    }
+}
\ No newline at end of file
diff --git a/main/w6/Cat.class b/main/w6/Cat.class
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diff --git a/main/w6/Dog.class b/main/w6/Dog.class
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diff --git a/main/w6/Swimmable.class b/main/w6/Swimmable.class
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