W6-高钰铎-202506050304

6.1.txt

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

6.2.txt

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

6.3.txt

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+public class Dog extends Animal implements Swimmable {
+    @Override
+    public void makeSound() {
+        System.out.println("狗：汪汪汪");
+    }
+
+    @Override
+    public void swim() {
+        System.out.println("狗会游泳");
+    }
+}

6.4.txt

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

6.5.txt

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+public class TestAnimal {
+    public static void main(String[] args) {
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+
+        dog.makeSound();
+        cat.makeSound();
+
+        // 向下转型调用游泳方法
+        if (dog instanceof Swimmable) {
+            Swimmable swimmable = (Swimmable) dog;
+            swimmable.swim();
+        }
+    }
+}