上传文件至 'w6'

w6/Animal.java

@@ -0,0 +1,3 @@
+public abstract class Animal{
+    public abstract void makeVoice();
+}

w6/Cat.java

@@ -0,0 +1,6 @@
+public class Cat extends Animal{
+    @Override
+    public void makeVoice(){
+        System.out.println("曼波，曼波，哦马资历———曼波");
+    }
+}

w6/Dog.java

@@ -0,0 +1,11 @@
+public  class Dog extends Animal implements Swimmable{
+    @Override
+    public void makeVoice(){
+        System.out.println("汪汪汪");
+    }
+    @Override
+    public void swim(){
+        System.out.println("狗会游泳");
+    }
+    
+}

w6/Main.java

@@ -0,0 +1,20 @@
+public class Main {
+    public void main(){
+        Animal cat = new Cat();
+        Animal dago = new Dog();
+        cat.makeVoice();
+        dago.makeVoice();
+        if(cat instanceof Swimmable){
+            System.out.println("猫会游泳");
+        }
+        else{
+            System.out.println("猫不会游泳");
+        if (dago instanceof Swimmable){
+            System.out.println("大狗会游泳");
+        }
+        else{
+            System.out.println("大狗不会游泳");
+        }
+        }
+    }
+}

w6/Swimmable.java

@@ -0,0 +1,3 @@
+public interface Swimmable {
+    public abstract void swim();
+}