diff --git a/W6/AnimalTest.java b/W6/AnimalTest.java
new file mode 100644
index 0000000..5dc40c6
--- /dev/null
+++ b/W6/AnimalTest.java
@@ -0,0 +1,26 @@
+public class AnimalTest {
+    public static void main(String[] args) {
+        // 创建动物数组，演示多态
+        Animal[] animals = new Animal[2];
+        animals[0] = new Dog();
+        animals[1] = new Cat();
+        
+        // 测试多态调用makeSound方法
+        System.out.println("测试动物叫声：");
+        for (Animal animal : animals) {
+            animal.makeSound();
+        }
+        
+        // 测试Dog的swim方法
+        System.out.println("\n测试游泳能力：");
+        if (animals[0] instanceof Swimmable) {
+            ((Swimmable) animals[0]).swim();
+        }
+        
+        if (animals[1] instanceof Swimmable) {
+            ((Swimmable) animals[1]).swim();
+        } else {
+            System.out.println("猫不会游泳！");
+        }
+    }
+}
\ No newline at end of file
diff --git a/W6/Cat.java b/W6/Cat.java
new file mode 100644
index 0000000..12ee151
--- /dev/null
+++ b/W6/Cat.java
@@ -0,0 +1,6 @@
+public class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("喵喵喵！");
+    }
+}
\ No newline at end of file
diff --git a/W6/Dog.java b/W6/Dog.java
new file mode 100644
index 0000000..5a536c5
--- /dev/null
+++ b/W6/Dog.java
@@ -0,0 +1,11 @@
+public class Dog extends Animal implements Swimmable {
+    @Override
+    public void makeSound() {
+        System.out.println("汪汪汪！");
+    }
+    
+    @Override
+    public void swim() {
+        System.out.println("狗在游泳！");
+    }
+}
\ No newline at end of file
diff --git a/W6/Swimmable.java b/W6/Swimmable.java
new file mode 100644
index 0000000..b7a501e
--- /dev/null
+++ b/W6/Swimmable.java
@@ -0,0 +1,3 @@
+public interface Swimmable {
+    void swim();
+}
\ No newline at end of file