René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Java 反射机制的学习","articleBody":"- 判断某个class是否为指定 interface 的实现\r\n![image](https://github.com/itjun/itjun-basic-java/assets/12244231/97f26a22-80bc-4e68-870e-9bb24e78f6c0)\r\n\r\n```java\r\n/**\r\n * 获取 EntityImpl 接口的所有实体实现类\r\n * \r\n * @param clazz EntityImpl`接口的实现类\r\n * @return entity类家族\r\n */\r\npublic static Set\u003cClass\u003c? extends EntityImpl\u003e\u003e getFamily(Class\u003c?\u003e clazz) {\r\n    var items = new ArrayList\u003cClass\u003c? extends EntityImpl\u003e\u003e(); // 使用通配符泛型\r\n    var classz = clazz;\r\n    if (classz.getSuperclass().isAnnotationPresent(EntityKey.class))\r\n        classz = classz.getSuperclass();\r\n    items.add(classz.asSubclass(EntityImpl.class));\r\n\r\n    for (var item : classz.getDeclaredClasses()) {\r\n        if (EntityImpl.class.isAssignableFrom(item))\r\n            items.add(item.asSubclass(EntityImpl.class));\r\n    }\r\n\r\n    var result = new HashSet\u003cClass\u003c? extends EntityImpl\u003e\u003e();\r\n    for (var item : items) {\r\n        if (item.isAnnotationPresent(EntityKey.class))\r\n            result.add(item);\r\n    }\r\n    return result;\r\n}\r\n```\r\n- 获取指定接口的所有子类\r\n- 获取指定父类的所有子类\r\n- 获取某个注解的所有子类","author":{"url":"https://github.com/itjun","@type":"Person","name":"itjun"},"datePublished":"2023-09-11T06:28:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/12/itjun-basic-java/issues/12"}