上传文件至 'w6'

w6/Cat.java

@@ -0,0 +1,9 @@
+package w6;
+
+public class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("喵喵喵");
+    }
+    
+}

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");
+    }
+}