diff --git a/w6/Animal.java b/w6/Animal.java
new file mode 100644
index 0000000..1de667f
--- /dev/null
+++ b/w6/Animal.java
@@ -0,0 +1,5 @@
+// 抽象类：Animal
+public abstract class Animal {
+    // 抽象方法：发出声音，子类必须重写
+    public abstract void makeSound();
+}
\ No newline at end of file
diff --git a/w6/Cat.java b/w6/Cat.java
new file mode 100644
index 0000000..19fac3c
--- /dev/null
+++ b/w6/Cat.java
@@ -0,0 +1,9 @@
+// Cat类：仅继承Animal，不实现Swimmable
+public class Cat extends Animal {
+
+    // 重写父类抽象方法：发出叫声
+    @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..ba471b1
--- /dev/null
+++ b/w6/Dog.java
@@ -0,0 +1,15 @@
+// Dog类：继承Animal，实现Swimmable接口
+public class Dog extends Animal implements Swimmable {
+
+    // 重写父类抽象方法：发出叫声
+    @Override
+    public void makeSound() {
+        System.out.println("汪汪汪！");
+    }
+
+    // 实现接口的swim方法
+    @Override
+    public void swim() {
+        System.out.println("小狗在水里游泳~");
+    }
+}
\ No newline at end of file
diff --git a/w6/Swimmable.java b/w6/Swimmable.java
new file mode 100644
index 0000000..acbf225
--- /dev/null
+++ b/w6/Swimmable.java
@@ -0,0 +1,5 @@
+// 接口：Swimmable（可游泳的能力）
+public interface Swimmable {
+    // 抽象方法：游泳
+    void swim();
+}
\ No newline at end of file
diff --git a/w6/TestAnimal.java b/w6/TestAnimal.java
new file mode 100644
index 0000000..d08fe6b
--- /dev/null
+++ b/w6/TestAnimal.java
@@ -0,0 +1,31 @@
+// 测试类：main方法，测试多态调用
+public class TestAnimal {
+    public static void main(String[] args) {
+        System.out.println("=== 1. 多态调用Animal父类引用 ===");
+        // 父类引用指向子类对象（多态核心）
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+
+        // 多态调用makeSound()：运行时自动执行子类的方法
+        dog.makeSound(); // 输出：汪汪汪！
+        cat.makeSound(); // 输出：喵喵喵！
+
+        System.out.println("\n=== 2. 测试Dog的游泳能力（接口多态） ===");
+        // 接口引用指向实现类对象（接口多态）
+        Swimmable swimmableDog = new Dog();
+        swimmableDog.swim(); // 输出：小狗在水里游泳~
+
+        System.out.println("\n=== 3. 类型判断与向下转型（可选拓展） ===");
+        // 判断Animal对象是否能游泳（instanceof）
+        if (dog instanceof Swimmable) {
+            System.out.println("Dog是可游泳的");
+            // 向下转型为Swimmable，调用swim方法
+            ((Swimmable) dog).swim();
+        }
+        if (cat instanceof Swimmable) {
+            System.out.println("Cat是可游泳的");
+        } else {
+            System.out.println("Cat不会游泳");
+        }
+    }
+}
diff --git a/w6/运行结果.png b/w6/运行结果.png
new file mode 100644
index 0000000..35e1558
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