实验二

实验二/CrawlerTest.java

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+import java.io.IOException;
+import java.util.List;
+
+// 测试类：验证继承+多态效果
+public class CrawlerTest {
+    public static void main(String[] args) throws IOException {
+        // 多态核心：父类引用指向子类对象
+        BaseMovieCrawler crawler = new MovieCrawler();
+
+        // 爬取前5部电影
+        List<Movie> movies = crawler.crawl(5);
+
+        System.out.println("\n=== 爬取结果 & 多态测试 ===");
+        for (Movie movie : movies) {
+            // 多态调用：同一个play()方法，不同子类表现不同行为
+            movie.play();
+        }
+
+        // 单独测试两个子类的多态
+        System.out.println("\n=== 子类多态单独测试 ===");
+        Movie theatreMovie = new TheatreMovie("流浪地球2", 2023, 9.3, "科幻", 59.9);
+        Movie animatedMovie = new AnimatedMovie("哪吒之魔童降世", 2019, 9.6, "动画", "可可豆动画");
+
+        theatreMovie.play();
+        animatedMovie.play();
+    }
+}