{"id":1369,"date":"2022-11-01T22:55:42","date_gmt":"2022-11-01T14:55:42","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1369"},"modified":"2022-11-27T12:39:45","modified_gmt":"2022-11-27T04:39:45","slug":"%e5%8f%8d%e5%b0%84-%e5%8f%8d%e5%b0%84%e4%b9%8b%e5%89%8d%ef%bc%8c%e7%b1%bb%e7%9a%84%e5%ae%9e%e4%be%8b%e5%8c%96%e7%ad%89%e6%93%8d%e4%bd%9c%e3%80%81%e4%bd%bf%e7%94%a8%e5%8f%8d%e5%b0%84%ef%bc%8c%e5%ae%9e","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1369","title":{"rendered":"\u53cd\u5c04-\u53cd\u5c04\u4e4b\u524d\uff0c\u7c7b\u7684\u5b9e\u4f8b\u5316\u7b49\u64cd\u4f5c\u3001\u4f7f\u7528\u53cd\u5c04\uff0c\u5b9e\u73b0\u540c\u4e0a\u7684\u64cd\u4f5c\u3001\u53cd\u5c04\u7684\u5f3a\u5927\uff1a\u8c03\u7528\u7c7b\u7684\u79c1\u6709\u7ed3\u6784\u3001\u5982\u4f55\u770b\u5f85\u53cd\u5c04\u548c\u5c01\u88c5\u6027\u4e24\u4e2a\u6280\u672f\u3001Class\u7c7b\u7684\u7406\u89e3\u3001\u83b7\u53d6Class\u5b9e\u4f8b\u76844\u79cd\u65b9\u5f0f\u3001Class\u5b9e\u4f8b\u5bf9\u5e94\u7684\u7ed3\u6784\u7684\u8bf4\u660e\u3001\u7406\u89e3\u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P637;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport java.lang.annotation.ElementType;\r\nimport java.lang.reflect.Constructor;\r\nimport java.lang.reflect.Field;\r\nimport java.lang.reflect.Method;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-11-01 \u4e0b\u5348 2:33\r\n *\/\r\npublic class ReflectionTest {\r\n\r\n    \/\/\u53cd\u5c04\u4e4b\u524d\uff0c\u5bf9\u4e8ePerson\u7684\u64cd\u4f5c\r\n    @Test\r\n    public void test1(){\r\n\r\n        \/\/1. \u521b\u5efaPerson\u7c7b\u7684\u5bf9\u8c61\r\n        Person p1 = new Person(\"Tom\",12);\r\n\r\n        \/\/2. \u901a\u8fc7\u5bf9\u8c61\uff0c\u8c03\u7528\u5176\u5185\u90e8\u7684\u5c5e\u6027\u3001\u65b9\u6cd5\r\n        p1.age = 10;\r\n        System.out.println(p1.toString());\r\n\r\n        p1.show();\r\n\r\n        \/\/\u5728Person\u7c7b\u5916\u90e8\uff0c\u4e0d\u53ef\u4ee5\u901a\u8fc7Person\u7c7b\u7684\u5bf9\u8c61\u8c03\u7528\u5176\u5185\u90e8\u79c1\u6709\u7ed3\u6784\r\n        \/\/\u6bd4\u5982\uff1aname\u3001showNation()\u4ee5\u53ca\u79c1\u6709\u7684\u6784\u9020\u5668\r\n\r\n    }\r\n\r\n    \/\/\u53cd\u5c04\u4e4b\u540e\uff0c\u5bf9\u4e8ePerson\u7684\u64cd\u4f5c\r\n    @Test\r\n    public void test2() throws Exception {\r\n        \/\/1. \u901a\u8fc7\u53cd\u5c04\uff0c\u521b\u5efaPerson\u7c7b\u7684\u5bf9\u8c61\r\n        Class clazz = Person.class;\r\n        Constructor cons = clazz.getConstructor(String.class, int.class);\r\n\r\n        Object obj = cons.newInstance(\"Tom\", 12);\r\n        Person p = (Person) obj;\r\n        System.out.println(p.toString());\r\n        \/\/2. \u901a\u8fc7\u53cd\u5c04\uff0c\u8c03\u7528\u5bf9\u8c61\u6307\u5b9a\u7684\u5c5e\u6027\u3001\u65b9\u6cd5\r\n        \/\/\u8c03\u7528\u5c5e\u6027\r\n        Field age = clazz.getDeclaredField(\"age\");\r\n        age.set(p,10);\r\n        System.out.println(p.toString());\r\n\r\n        \/\/\u8c03\u7528\u65b9\u6cd5\r\n        Method show = clazz.getDeclaredMethod(\"show\");\r\n        show.invoke(p);\r\n\r\n        System.out.println(\"***********************************\");\r\n\r\n        \/\/\u901a\u8fc7\u53cd\u5c04\uff0c\u53ef\u4ee5\u8c03\u7528Person\u7c7b\u7684\u79c1\u6709\u7ed3\u6784\u7684\u3002\u6bd4\u5982\uff1a\u79c1\u6709\u7684\u6784\u9020\u5668\u3001\u65b9\u6cd5\u3001\u5c5e\u6027\r\n        \/\/\u8c03\u7528\u79c1\u6709\u7684\u6784\u9020\u5668\r\n        Constructor cons1 = clazz.getDeclaredConstructor(String.class);\r\n        cons1.setAccessible(true);\r\n        Person p1 = (Person) cons1.newInstance(\"Jerry\");\r\n        System.out.println(p1);\r\n\r\n        \/\/\u8c03\u7528\u79c1\u6709\u7684\u5c5e\u6027\r\n        Field name = clazz.getDeclaredField(\"name\");\r\n        name.setAccessible(true);\r\n        name.set(p1,\"HanMeimei\");\r\n        System.out.println(p1);\r\n\r\n        \/\/\u8c03\u7528\u79c1\u6709\u7684\u65b9\u6cd5\r\n        Method showNation = clazz.getDeclaredMethod(\"showNation\", String.class);\r\n        showNation.setAccessible(true);\r\n        String nation = (String) showNation.invoke(p1,\"\u4e2d\u56fd\");\/\/\u76f8\u5f53\u4e8eString nation = p1.showNation(\"\u4e2d\u56fd\")\r\n        System.out.println(nation);\r\n    }\r\n\r\n    \/\/\u7591\u95ee1\uff1a\u901a\u8fc7\u76f4\u63a5new\u7684\u65b9\u5f0f\u6216\u53cd\u5c04\u7684\u65b9\u5f0f\u90fd\u53ef\u4ee5\u8c03\u7528\u516c\u5171\u7684\u7ed3\u6784\uff0c\u5f00\u53d1\u4e2d\u5230\u5e95\u7528\u54ea\u4e2a\uff1f\r\n    \/\/\u5efa\u8bae\uff1a\u76f4\u63a5new\u7684\u65b9\u5f0f\u3002\r\n    \/\/\u4ec0\u4e48\u65f6\u5019\u4f1a\u4f7f\u7528\uff1a\u53cd\u5c04\u7684\u65b9\u5f0f\u3002    \u53cd\u5c04\u7684\u7279\u5f81\uff1a\u52a8\u6001\u6027\r\n    \/\/\u7591\u95ee2\uff1a\u53cd\u5c04\u673a\u5236\u4e0e\u9762\u5411\u5bf9\u8c61\u4e2d\u7684\u5c01\u88c5\u6027\u662f\u4e0d\u662f\u77db\u76fe\u7684\uff1f\u5982\u4f55\u770b\u5f85\u4e24\u4e2a\u6280\u672f\uff1f\r\n    \/\/\u4e0d\u77db\u76fe\u3002\r\n\r\n\r\n    \/*\r\n    \u5173\u4e8ejava.lang.Class\u7c7b\u7684\u7406\u89e3\r\n    1. \u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\uff1a\r\n    \u7a0b\u5e8f\u7ecf\u8fc7javac.exe\u547d\u4ee4\u4ee5\u540e\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u8282\u7801\u6587\u4ef6(.class\u7ed3\u5c3e)\u3002\r\n    \u63a5\u7740\u6211\u4eec\u4f7f\u7528java.exe\u547d\u4ee4\u5bf9\u67d0\u4e2a\u5b57\u8282\u7801\u6587\u4ef6\u8fdb\u884c\u89e3\u91ca\u8fd0\u884c\u3002\u76f8\u5f53\u4e8e\u5c06\u67d0\u4e2a\u5b57\u8282\u7801\u6587\u4ef6\r\n    \u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002\u6b64\u8fc7\u7a0b\u5c31\u79f0\u4e3a\u7c7b\u7684\u52a0\u8f7d\u3002\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u7684\u7c7b\uff0c\u6211\u4eec\u5c31\u79f0\u4e3a\u8fd0\u884c\u65f6\u7c7b\uff0c\u6b64\r\n    \u8fd0\u884c\u65f6\u7c7b\uff0c\u5c31\u4f5c\u4e3aClass\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002\r\n\r\n    2. \u6362\u53e5\u8bdd\u8bf4\uff0cClass\u7684\u5b9e\u4f8b\u5c31\u5bf9\u5e94\u7740\u4e00\u4e2a\u8fd0\u884c\u65f6\u7c7b\r\n    3. \u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u7684\u8fd0\u884c\u65f6\u7c7b\uff0c\u4f1a\u7f13\u5b58\u4e00\u5b9a\u7684\u65f6\u95f4\u3002\u5728\u6b64\u65f6\u95f4\u4e4b\u5185\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u7684\u65b9\u5f0f\r\n        \u6765\u83b7\u53d6\u6b64\u8fd0\u884c\u65f6\u7c7b\u3002\r\n\r\n     *\/\r\n    \/\/\u83b7\u53d6Class\u7684\u5b9e\u4f8b\u7684\u65b9\u5f0f\uff08\u524d\u4e09\u79cd\u65b9\u5f0f\u9700\u8981\u638c\u63e1\uff09\r\n    @Test\r\n    public void test3() throws ClassNotFoundException {\r\n        \/\/\u65b9\u5f0f\u4e00\uff1a\u8c03\u7528\u8fd0\u884c\u65f6\u7c7b\u7684\u5c5e\u6027\uff1a.class\r\n        Class clazz1 = Person.class;\r\n        System.out.println(clazz1);\r\n        \/\/\u65b9\u5f0f\u4e8c\uff1a\u901a\u8fc7\u8fd0\u884c\u65f6\u7c7b\u7684\u5bf9\u8c61,\u8c03\u7528getClass()\r\n        Person p1 = new Person();\r\n        Class clazz2 = p1.getClass();\r\n        System.out.println(clazz2);\r\n\r\n        \/\/\u65b9\u5f0f\u4e09\uff1a\u8c03\u7528Class\u7684\u9759\u6001\u65b9\u6cd5\uff1aforName(String classPath)\r\n        Class clazz3 = Class.forName(\"top.qaqaq.java.P637.Person\");\r\n\/\/        clazz3 = Class.forName(\"java.lang.String\");\r\n        System.out.println(clazz3);\r\n\r\n        System.out.println(clazz1 == clazz2);\r\n        System.out.println(clazz1 == clazz3);\r\n\r\n        \/\/\u65b9\u5f0f\u56db\uff1a\u4f7f\u7528\u7c7b\u7684\u52a0\u8f7d\u5668\uff1aClassLoader   (\u4e86\u89e3)\r\n        ClassLoader classLoader = ReflectionTest.class.getClassLoader();\r\n        Class&lt;?> clazz4 = classLoader.loadClass(\"top.qaqaq.java.P637.Person\");\r\n        System.out.println(clazz4);\r\n\r\n        System.out.println(clazz1 == clazz4);\r\n    }\r\n\r\n    \/\/\u4e07\u4e8b\u4e07\u7269\u7686\u5bf9\u8c61\uff1f\u5bf9\u8c61.xxx,File,URL,\u53cd\u5c04,\u524d\u7aef\u3001\u6570\u636e\u5e93\u64cd\u4f5c\r\n\r\n    \/\/Class\u5b9e\u4f8b\u53ef\u4ee5\u662f\u54ea\u4e9b\u7ed3\u6784\u7684\u8bf4\u660e\uff1a\r\n    @Test\r\n    public void test4(){\r\n        Class c1 = Object.class;\r\n        Class c2 = Comparable.class;\r\n        Class c3 = String&#91;].class;\r\n        Class c4 = int&#91;]&#91;].class;\r\n        Class c5 = ElementType.class;\r\n        Class c6 = Override.class;\r\n        Class c7 = int.class;\r\n        Class c8 = void.class;\r\n        Class c9 = Class.class;\r\n\r\n        int&#91;] a = new int&#91;10];\r\n        int&#91;] b = new int&#91;100];\r\n        Class c10 = a.getClass();\r\n        Class c11 = b.getClass();\r\n    \/\/ \u53ea\u8981\u6570\u7ec4\u7684\u5143\u7d20\u7c7b\u578b\u4e0e\u7ef4\u5ea6\u4e00\u6837\uff0c\u5c31\u662f\u540c\u4e00\u4e2aClass\r\n        System.out.println(c10 == c11);\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P637;\r\n\r\n\/**\r\n * @author RichieZhang\r\n * @create 2022-11-01 \u4e0b\u5348 2:34\r\n *\/\r\npublic class Person {\r\n\r\n    private String name;\r\n    public int age;\r\n\r\n    public Person() {\r\n\r\n    }\r\n\r\n    private Person(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    public Person(String name, int age) {\r\n        this.name = name;\r\n        this.age = age;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public void setName(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    public int getAge() {\r\n        return age;\r\n    }\r\n\r\n    public void setAge(int age) {\r\n        this.age = age;\r\n    }\r\n\r\n    @Override\r\n    public String toString() {\r\n        return \"Person{\" +\r\n                \"name='\" + name + '\\'' +\r\n                \", age=\" + age +\r\n                '}';\r\n    }\r\n\r\n    public void show(){\r\n        System.out.println(\"\u4f60\u597d\uff0c\u6211\u662f\u4e00\u4e2a\u4eba\");\r\n    }\r\n\r\n    private String showNation(String nation){\r\n        System.out.println(\"\u6211\u7684\u56fd\u7c4d\u662f\" + nation);\r\n        return nation;\r\n    }\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-1369","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1369"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1369"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1369\/revisions"}],"predecessor-version":[{"id":1370,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1369\/revisions\/1370"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}