diff --git a/w6/Animal.class b/w6/Animal.class
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diff --git a/w6/Animal.java b/w6/Animal.java
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--- /dev/null
+++ b/w6/Animal.java
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+// 抽象类：动物，定义所有动物的通用行为
+public abstract class Animal {
+    // 抽象方法：发出声音，没有方法体，由子类实现
+    public abstract void makeSound();
+}
\ No newline at end of file
diff --git a/w6/AnimalTest.class b/w6/AnimalTest.class
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diff --git a/w6/AnimalTest.java b/w6/AnimalTest.java
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--- /dev/null
+++ b/w6/AnimalTest.java
@@ -0,0 +1,25 @@
+// 测试类：主程序入口，测试多态调用
+public class AnimalTest {
+    public static void main(String[] args) {
+        // 多态：父类引用指向子类对象
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+
+        // 1. 测试动物叫声的多态调用
+        System.out.println("=== 动物叫声测试 ===");
+        dog.makeSound(); // 执行Dog类的makeSound()
+        cat.makeSound(); // 执行Cat类的makeSound()
+
+        // 2. 测试游泳能力（只有Dog实现了Swimmable）
+        System.out.println("\n=== 游泳能力测试 ===");
+        // 判断dog是否实现了Swimmable接口，避免转型异常
+        if (dog instanceof Swimmable) {
+            Swimmable swimmableDog = (Swimmable) dog;
+            swimmableDog.swim(); // 执行Dog类的swim()
+        }
+        // Cat没有实现接口，无法调用swim()
+        if (!(cat instanceof Swimmable)) {
+            System.out.println("猫不会游泳");
+        }
+    }
+}
\ No newline at end of file
diff --git a/w6/Cat.class b/w6/Cat.class
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diff --git a/w6/Cat.java b/w6/Cat.java
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index 0000000..30c87e1
--- /dev/null
+++ b/w6/Cat.java
@@ -0,0 +1,8 @@
+// 猫类：仅继承动物抽象类，不实现游泳接口
+public class Cat extends Animal {
+    // 重写抽象方法：猫的叫声
+    @Override
+    public void makeSound() {
+        System.out.println("喵喵喵~");
+    }
+}
diff --git a/w6/Dog.java b/w6/Dog.java
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index 0000000..99aaf68
--- /dev/null
+++ b/w6/Dog.java
@@ -0,0 +1,14 @@
+// 狗类：继承动物抽象类，同时实现游泳接口
+public class Dog extends Animal implements Swimmable {
+    // 重写抽象方法：狗的叫声
+    @Override
+    public void makeSound() {
+        System.out.println("汪汪汪！");
+    }
+
+    // 实现接口方法：狗会游泳
+    @Override
+    public void swim() {
+        System.out.println("狗刨式游泳");
+    }
+}
\ No newline at end of file
diff --git a/w6/Swimmable.java b/w6/Swimmable.java
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index 0000000..fea4154
--- /dev/null
+++ b/w6/Swimmable.java
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+// 接口：可游泳的，定义游泳能力
+public interface Swimmable {
+    // 接口方法：游泳，默认public abstract，可省略
+    void swim();
+}