w6

w6/Animal.java

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+package w6;
+
+public abstract class Animal {
+
+    public abstract void makeSound();
+}
+

w6/AnimalTest.java

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+package w6;
+
+public class AnimalTest {
+    public static void main(String[] args) {
+        //多态调用Animal抽象类
+        System.out.println("===动物叫声测试===");
+        Animal dog1=new Dog();
+        Animal cat1=new Cat();
+        dog1.makeSound();
+        cat1.makeSound();
+        //多态调用Swimmable接口
+        System.out.println("\n===游泳能力测试===");
+        Swimmable swimmer = new Dog();
+        swimmer.swim();
+        //数组遍历多态演示
+        System.out.println("\n===数组多态遍历===");
+        Animal[] animals={new Dog(),new Cat()};
+        for (Animal animal :animals) {
+            animal.makeSound();
+            if (animal instanceof Dog) {
+                ((Dog) animal).swim();
+            }
+        }
+
+
+    }
+    
+}

w6/Cat.java

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

w6/Dog.java

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+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");
+    }
+}

w6/Swimmable.java

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+package w6;
+
+public interface Swimmable {
+    void swim();
+}