{"id":31008,"date":"2023-06-14T16:40:22","date_gmt":"2024-01-05T15:09:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84%e5%8f%8d%e5%b0%84-java-lang-reflect\/"},"modified":"2025-08-12T21:50:33","modified_gmt":"2025-08-12T13:50:33","slug":"java-%e7%9a%84%e5%8f%8d%e5%b0%84-java-lang-reflect","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84%e5%8f%8d%e5%b0%84-java-lang-reflect\/","title":{"rendered":"Java \u7684\u53cd\u5c04 java.lang.reflect"},"content":{"rendered":"<h3>\u51c6\u5907\u4e00\u4e2a\u73ed\u7ea7\u3002<\/h3>\n<pre class=\"post-pre\"><code>class Person {\r\nprivate String name = \"tony\";\r\nprivate int age = 41;\r\npublic Person() {\r\n\r\n}\r\npublic Person(String name , int age ) {\r\n    this.name = name;\r\n    this.age = age;\r\n}\r\n@Override\r\npublic String toString() {\r\n    \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6\r\n    return String.format(\"\u540d\u524d\u306f%s,\u5e74\u9f62\u306f%d\", name,age);\r\n}\r\npublic String getName() {\r\n    return name;\r\n}\r\npublic void setName(String name) {\r\n    this.name = name;\r\n}\r\npublic int getAge() {\r\n    return age;\r\n}\r\npublic void setAge(int age) {\r\n    this.age = age;\r\n}\r\n}\r\n<\/code><\/pre>\n<h3>\u83b7\u53d62\u4e2a\u7c7b\u7684\u65b9\u6cd5<\/h3>\n<pre class=\"post-pre\"><code>private static void demoClassName()  {\r\n    Class&lt;?&gt; class1 = Date.class;\r\n    System.out.println(\"--Date.class--\");\r\n    System.out.println(class1.getName());\r\n    System.out.println(class1.getSimpleName());\r\n\r\n    java.util.Date date = new java.util.Date();\r\n    Class&lt;?&gt; class2 = date.getClass();\r\n    System.out.println(\"--date.getClass()--\");\r\n    System.out.println(class2.getName());\r\n    System.out.println(class2.getSimpleName());\r\n\r\n    Class&lt;?&gt; class3;\r\n    try {\r\n        class3 = Class.forName(\"com.yanheng.reflect.Person\");\r\n        System.out.println(class3.getName());\r\n        System.out.println(class3.getSimpleName());\r\n    } catch (ReflectiveOperationException e) {\r\n        e.printStackTrace();\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<h3>\u751f\u62103\u4e2a\u5b9e\u4f8b\u7684\u65b9\u6cd5\uff08\u65e0\u53c2\u6570\uff09<\/h3>\n<pre class=\"post-pre\"><code>private static void demoCreateInstance() {\r\n    Class&lt;?&gt; class3;\r\n    try {\r\n        class3 = Class.forName(\"com.yanheng.reflect.Person\");\r\n\r\n        Person person = (Person) class3.newInstance();\r\n        System.out.println(person.toString());\r\n    } catch (ReflectiveOperationException e) {\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>\u751f\u62104\u4e2a\u5b9e\u4f8b\u7684\u65b9\u6cd5\uff08\u5e26\u53c2\u6570\uff09<\/h3>\n<pre class=\"post-pre\"><code>private static void demoConstructor() {\r\n    try {\r\n        Class&lt;?&gt; clazz = Class.forName(\"com.yanheng.reflect.Person\");\r\n        Constructor constructor = clazz.getConstructor(String.class , int.class);\r\n        Person person = (Person) constructor.newInstance(\"\u963f\u90e8\",25);\r\n        System.out.println(person.toString());\r\n    } catch (ClassNotFoundException  e) {\r\n        e.printStackTrace();\r\n    } catch (InstantiationException e) {\r\n        e.printStackTrace();\r\n    } catch (IllegalAccessException e) {\r\n        e.printStackTrace();\r\n    } catch (IllegalArgumentException e) {\r\n        e.printStackTrace();\r\n    } catch (InvocationTargetException e) {\r\n        e.printStackTrace();\r\n    } catch (NoSuchMethodException e) {\r\n        e.printStackTrace();\r\n    } catch (SecurityException e) {\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>\u5982\u4f55\u8c03\u75281.5\u4e2a\u5b9e\u4f8b\u7684\u65b9\u6cd5<\/h3>\n<pre class=\"post-pre\"><code>private static void demoMethod() {\r\n    Person person;\r\n    Class&lt;?&gt; clazz;\r\n    Method methodsetName;\r\n    Method methodSetAge;\r\n    try {\r\n        clazz = Class.forName(\"com.yanheng.reflect.Person\");\r\n        person = (Person) clazz.newInstance();\r\n        methodsetName = clazz.getMethod(\"setName\", String.class);\r\n        methodSetAge = clazz.getMethod(\"setAge\", int.class);\r\n        methodsetName.invoke(person, \"Tom\");\r\n        methodSetAge.invoke(person, 32);\r\n        System.out.println(person.toString());\r\n    } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (NoSuchMethodException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (SecurityException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (IllegalArgumentException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (InvocationTargetException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>\u8c03\u75281.5\u4e2a\u79c1\u6709\u5b9e\u4f8b\u5b57\u6bb5\u7684\u65b9\u6cd5<\/h3>\n<pre class=\"post-pre\"><code>private static void demoLocalVariable() {\r\n    Person person;\r\n    Class&lt;?&gt; clazz;\r\n    Field fieldName;\r\n    Field fieldAge;\r\n\r\n    try {\r\n        clazz = Class.forName(\"com.yanheng.reflect.Person\");\r\n        person = (Person) clazz.newInstance();\r\n\r\n        fieldName = clazz.getDeclaredField(\"name\");\r\n        fieldName.setAccessible(true);\r\n        fieldName.set(person, \"Jack\");\r\n\r\n        fieldAge = clazz.getDeclaredField(\"age\");\r\n        fieldAge.setAccessible(true);\r\n        fieldAge.set(person, 23);\r\n\r\n        System.out.println(person.toString());\r\n    } catch (ClassNotFoundException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (InstantiationException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (IllegalAccessException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (NoSuchFieldException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    } catch (SecurityException e) {\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n        e.printStackTrace();\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<h3>\u5e94\u7528\u8bbe\u8ba1\u5de5\u5382<\/h3>\n<h3>\u51c6\u59072.1\u63a5\u53e3\u548c\u7c7b\u3002<\/h3>\n<pre class=\"post-pre\"><code>interface Fruit {\r\n    void eat();\r\n}\r\nclass Apple implements Fruit {\r\n    @Override\r\n    public void eat() {\r\n        System.out.println(\"\u30ea\u30f3\u30b4\u304a\u3044\u3057\u3044\");\r\n    }\r\n}\r\n\r\nclass Lemon implements Fruit {\r\n\r\n    @Override\r\n    public void eat() {\r\n        System.out.println(\"\u30ec\u30e2\u30f3\u9178\u3063\u3071\u3044\u3088\");\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<h3>\u4e3a2.2\u5de5\u5382\u505a\u51c6\u5907<\/h3>\n<pre class=\"post-pre\"><code>class FruitFactory {\r\n    public static Fruit getInstance(String fruitName) {\r\n        Fruit fruit = null;\r\n        try {\r\n            fruit = (Fruit) Class.forName(fruitName).newInstance();\r\n        } catch (ClassNotFoundException e) {\r\n            \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n            e.printStackTrace();\r\n        } catch (InstantiationException | IllegalAccessException e) {\r\n            \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af\r\n            e.printStackTrace();\r\n        }\r\n        return fruit;\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>2.3\u5de5\u5382\u6f14\u793a<\/h3>\n<pre class=\"post-pre\"><code>private static void demoFactory() {\r\n    String name = \"com.yanheng.reflect.Apple\";\r\n    Fruit fruit = FruitFactory.getInstance(name);\r\n    fruit.eat();\r\n\r\n    name = \"com.yanheng.reflect.Lemon\";\r\n    Fruit fruit2 = FruitFactory.getInstance(name);\r\n    fruit2.eat();\r\n}\r\n<\/code><\/pre>\n<h3>3\u4e2a\u793a\u4f8b\u4ee3\u7801<\/h3>\n<h3>4new\u548creflect\u7684\u6bd4\u8f83<\/h3>\n<p>\u7528new\u5173\u952e\u5b57\u521b\u5efa\u5b9e\u4f8b\uff1a<br \/>\n\u4f18\u70b9\uff1a\u901f\u5ea6\u5feb<\/p>\n<p>\u901a\u8fc7\u53cd\u5c04\u521b\u5efa\u5b9e\u4f8b\uff1a<br \/>\n\u4f18\u70b9\uff1a\u5177\u6709\u826f\u597d\u7684\u6269\u5c55\u6027\u3002<\/p>\n<h3>\u5bf9Android\u6846\u67b6\u7684\u5e94\u7528<\/h3>\n<h5>\u5728\u542f\u52a8\u65f6\u4f7f\u7528&#8221;startActivity(intent)&#8221;\u6765\u521b\u5efaactivity\u7684\u5b9e\u4f8b\u5e76\u8c03\u7528onCreate\u3002<\/h5>\n<p>Flamework\u5982\u4f55\u521b\u5efa\u5b9e\u4f8b\uff1f<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u67e5\u770b\u4e00\u4e0b\u4ee3\u7801\u5427\uff0c\u5728ActivityThread\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {\r\n    ContextImpl appContext = createBaseContextForActivity(r);\r\n    Activity activity = null;\r\n    try {\r\n        java.lang.ClassLoader cl = appContext.getClassLoader();\r\n        activity = mInstrumentation.newActivity(\r\n                cl, component.getClassName(), r.intent);\r\n        StrictMode.incrementExpectedActivityCount(activity.getClass());\r\n        r.intent.setExtrasClassLoader(cl);\r\n        r.intent.prepareToEnterProcess();\r\n        if (r.state != null) {\r\n            r.state.setClassLoader(cl);\r\n        }\r\n    } catch (Exception e) {\r\n<\/code><\/pre>\n<p>\u4f7f\u7528\u3055\u308c\u308b\u4e2d\u56fd\u8a9e\u306e\u30cd\u30a4\u30c6\u30a3\u30d6\u8868\u73fe\u3092\u6c42\u3081\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u30011\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3060\u3051\u3067\u7d50\u69cb\u3067\u3059\u3002<\/p>\n<p>\u5728AppComponentFactory\u4e2d\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>public @NonNull Activity instantiateActivity(@NonNull ClassLoader cl, @NonNull String className,\r\n        @Nullable Intent intent)\r\n        throws InstantiationException, IllegalAccessException, ClassNotFoundException {\r\n    return (Activity) cl.loadClass(className).newInstance();\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c\u901a\u8fc7\u7c7b\u540d\u751f\u6210\u4e86\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u51c6\u5907\u4e00\u4e2a\u73ed\u7ea7\u3002 class Person { private String name = &#8220;tony&#8221;; pr [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31008","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u7684\u53cd\u5c04 java.lang.reflect - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava \u7684\u53cd\u5c04 java.lang.reflect\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u7684\u53cd\u5c04-java-lang-reflect\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u7684\u53cd\u5c04 java.lang.reflect\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava \u7684\u53cd\u5c04 java.lang.reflect\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u7684\u53cd\u5c04-java-lang-reflect\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-05T15:09:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T13:50:33+00:00\" \/>\n<meta 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