diff --git a/W6/AnimalTest.java b/W6/AnimalTest.java
new file mode 100644
index 0000000..ab4707e
--- /dev/null
+++ b/W6/AnimalTest.java
@@ -0,0 +1,45 @@
+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("狗刨式游泳");
+    }
+}
+class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("喵喵喵！");
+    }
+}
+public class AnimalTest {
+    public static void main(String[] args) {
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+
+        System.out.println("=== 动物叫声 ===");
+        dog.makeSound();
+        cat.makeSound();
+
+        System.out.println("\n=== 游泳测试 ===");
+        if (dog instanceof Swimmable) {
+            Swimmable s = (Swimmable) dog;
+            s.swim();
+        }
+        if (cat instanceof Swimmable) {
+            Swimmable s = (Swimmable) cat;
+            s.swim();
+        } else {
+            System.out.println("猫不会游泳");
+        }
+
+    }
+}
diff --git a/W6/运行截图.png b/W6/运行截图.png
new file mode 100644
index 0000000..440ff47
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