diff --git a/W6/W6作业.java b/W6/W6作业.java
new file mode 100644
index 0000000..d0f3ecb
--- /dev/null
+++ b/W6/W6作业.java
@@ -0,0 +1,60 @@
+// 动物叫声系统
+
+// 抽象类 Animal
+abstract class Animal {
+    // 抽象方法 makeSound()
+    public abstract void makeSound();
+}
+
+// 接口 Swimmable
+interface Swimmable {
+    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: Woof! Woof!");
+    }
+    
+    @Override
+    public void swim() {
+        System.out.println("Dog is swimming");
+    }
+}
+
+// Cat 类继承 Animal，但不实现 Swimmable 接口
+class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("Cat: Meow! Meow!");
+    }
+}
+
+// 测试类
+public class W6作业 {
+    public static void main(String[] args) {
+        // 测试多态调用
+        Animal animal1 = new Dog();
+        Animal animal2 = new Cat();
+        
+        System.out.println("Testing polymorphic calls:");
+        animal1.makeSound();
+        animal2.makeSound();
+        
+        // 测试 Swimmable 接口
+        System.out.println("\nTesting Swimmable interface:");
+        if (animal1 instanceof Swimmable) {
+            ((Swimmable) animal1).swim();
+        } else {
+            System.out.println("Dog cannot swim");
+        }
+        
+        if (animal2 instanceof Swimmable) {
+            ((Swimmable) animal2).swim();
+        } else {
+            System.out.println("Cat cannot swim");
+        }
+    }
+}
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