diff --git a/w6/Cat.java b/w6/Cat.java
new file mode 100644
index 0000000..014fabf
--- /dev/null
+++ b/w6/Cat.java
@@ -0,0 +1,9 @@
+package w6;
+
+public class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("喵喵喵");
+    }
+    
+}
diff --git a/w6/Dog.java b/w6/Dog.java
new file mode 100644
index 0000000..82c73cd
--- /dev/null
+++ b/w6/Dog.java
@@ -0,0 +1,13 @@
+package w6;
+
+public 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");
+    }
+}
\ No newline at end of file