diff --git a/w6/Animal.java b/w6/Animal.java
new file mode 100644
index 0000000..e69de29
diff --git a/w6/AnimalTest.java b/w6/AnimalTest.java
new file mode 100644
index 0000000..457d59b
--- /dev/null
+++ b/w6/AnimalTest.java
@@ -0,0 +1,27 @@
+package w6;
+
+public class AnimalTest {
+    public static void main(String[] args) {
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+
+
+        System.out.println("动物叫声测试");
+        dog.makeSound();
+        cat.makeSound();
+
+
+        System.out.println("游泳能力测试");
+        if (dog instanceof Swimmable) {
+            ((Swimmable) dog).swim();
+        } else {
+            System.out.println("这只动物不会游泳");
+        }
+
+        if (cat instanceof Swimmable) {
+            ((Swimmable) cat).swim();
+        } else {
+            System.out.println("猫不会游泳");
+        }
+    }
+}
\ No newline at end of file